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SOLARNET International Conferences

Sun in Science and Society Free Conference is closed

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solarnet5

Hosted by SOLARNET - High Resolution Solar Physics Network

Affiliation Leibniz-Institut für Sonnenphysik

The Meeting will take place at:

M9 MUSEUM OF THE 20TH CENTURY

11.09.2023 - 15.09.2023

Organizing institutions

University of Rome Tor Vergata

University of Catania

Main category Natural Sciences (Astrophysics and Astrononmy)

Alternative category Social Sciences (Economics)

Conference/Workshop objectives

All the information about the Conference at the LINK https://solarnet-s3.com/

Local organizing committee

Dario Del Moro (chair), Department of Physics, University of Rome Tor Vergata, Italy

Luca Giovannelli, Department of Physics, University of Rome Tor Vergata, Italy

Salvo Guglielmino, INAF – Astronophysical Observatory of Catania, Italy

Mariarita Murabito, INAF – Astronomical Observatory of Capodimonte, Italy

Archana Giri Nair, Department of Physics, University of Rome Tor Vergata, Italy

Fallon Konow, Department of Physics, University of Rome Tor Vergata, Italy

Fabiana Ferrente, Department of Physics and Astronomy, University of Catania, Italy

Naganna Vasantharaju, Department of Physics and Astronomy, University of Catania, Italy

Antonio Grandieri, Licei Sperimentali “L. Stefanini”, Mestre, Italy

Scientific organizing committee (SOC)

Francesco Berrilli (chair), Department of Physics, University of Rome Tor Vergata, Italy

Francesca Zuccarello (co-chair), Department of Physics and Astronomy, University of Catania, Italy

Manuel Collados Vera, Instituto de Astrofísica de Canarias, Spain

Paola De Michelis, Istituto Nazionale di Geofisica e Vulcanologia, Italy

Bernhard Fleck, Directorate of Science, ESA

Margit Haberreiter, Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center, Switzerland

Emilia Kilpua, Department of Physics, University of Helsinki, Finland

Maria Madjarska, Max Planck Institute for Solar System Research, Germany and Space Research and Technology Institute, Sofia, Bulgaria

Etienne Pariat, LESIA, Observatoire de Paris, France

Francesco Pegoraro, Accademia Nazionale dei Lincei, Italy

Roberto Ragazzoni, INAF - Osservatorio Astronomico di Padova, Italy

Steven Tobias, Department of Applied Mathematics, University of Leeds, United Kingdom

Daniela Vuri, Department of Economics, University of Rome Tor Vergata, Italy

Submit Abstract

Sessions

Solar activity and its drivers
Sun, Space and Society
High-Resolution ground-based telescopes and Technology for solar physics
Sun, Space and Society (solar physics impact on economy and society, data for 'civil ’society, education and outreach)
The Sun as a Rosetta Stone for astrophysics
The Sun as a Rosetta Stone for physics

Programme

All the information about the Conference at the LINK https://solarnet-s3.com/

Invited speakers

All the information about the Conference at the LINK https://solarnet-s3.com/

Important dates

May 1, 2023: Registration opens

May 1, 2023: Submission of applications for financial support opens

June 15, 2023: Registration closes

June 15, 2023: Submission of applications closes

June 15, 2023: Deadline for abstracts submission

End of June: Decision on the financial support

Registration and payment information

All the information about the Conference at the LINK https://solarnet-s3.com/

Conference venue

The Meeting will take place at M9 – Museum of the 20th Century

Hotel information

All the information about the Conference at the LINK https://solarnet-s3.com/

Travel information

All the information about the Conference at the LINK https://solarnet-s3.com/

There are no uploaded videos yet.

Tatiana Podladchikova

Session: Solar activity and its drivers

78 views

Date of upload:

22.09.2023

Co-author:

Shantanu Jain, Astrid Veronig, Werner Pötzi, Frédéric Clette, Olga Sutyrina, Mateja Dumbovic

Abstract:

Forecasting the solar cycle amplitude is important for many space weather applications. We demonstrate a steady relationship between the maximal growth rate of sunspot activity in the cycle ascending phase and the subsequent cycle amplitude using four data sets of solar activity indices: total sunspot numbers, hemispheric sunspot numbers from the new catalogue, total sunspot areas, and hemispheric sunspot areas. For all the data sets, a linear regression based on the maximal growth rate precursor shows a significant correlation. Validation of predictions for cycles 1-24 shows high correlations between the true and predicted cycle amplitudes reaching r = 0.93 for the total sunspot numbers. Furthermore, our findings provide a strong foundation for supporting regular monitoring, recording, and predictions of solar activity with hemispheric sunspot data, which capture the asymmetric behaviour of the solar activity and solar magnetic field and enhance solar cycle prediction methods.

Francesco Pegoraro

Session: Solar activity and its drivers

75 views

Date of upload:

23.09.2023

Co-author:

S.V. Bulanov, ELI BEAMLINES, Dolni Brezany, Czech Republic

Abstract:

In a relativistic plasma regime magnetic reconnection may take completely different features due to the relativistic limit on the particle velocity under conditions of quasineutrality when the spatial variation of the magnetic field cannot be balanced by the electron current in Ampere's law. In this case the MHD description fails and the magnetic field dynamics is dominated by the displacement current and by the corresponding inductive electric field as proposed by S.I. Syrovatskii nearly 60 years ago in the context of Cosmic physics, and may provide an efficient, time variable acceleration mechanism in a relativistic inhomogeneous plasma. Recently this regime it has become of interest also in the context of relativistic laboratory plasmas .J. Gu, F. Pegoraro, P.V. Sasorov, D. Golovin, A. Yogo, G. Korn, S.V. Bulanov, {\it Electromagnetic Burst Generation during Annihilation of Magnetic Field in Relativistic Laser-Plasma Interaction}, Sci. Rep., 9 , 19462 (2019)

Aglae Kellerer

Session: High-Resolution ground-based telescopes and Technology for solar physics

74 views

Date of upload:

23.09.2023

Co-author:

Abstract:

The presentation starts with a description of multi-conjugate adaptive optics (AO). Multi conjugate AO comes in two flavors: star and layer-oriented. Until now solar astronomy is based on the star oriented approach. The slides illustrate why the layer oriented approach is very well suited for solar observations.

Göran Scharmer

Session: High-Resolution ground-based telescopes and Technology for solar physics

72 views

Date of upload:

25.09.2023

Co-author:

Bo Lindberg, Luc Rouppe van der Voort, Jaime de la Cruz Rodriguez

Abstract:

The development of instrumentation for the European Solar Telescope (EST) benefits strongly from on-going development and use of similar instrumentation on previously built European solar telescopes. Here, we discuss the design and performance of CRISP and CHROMIS, which are the most scientifically productive instruments at the Swedish 1-m Solar Telescope. These are of high relevance to the development of the Tunable Imager Spectrometers (TISs), which will be functionally similar to CRISP and are expected to be the most highly requested first-generation instruments at EST. We showcase sample data and demonstrate the superior image quality of CRISP and CHROMIS. We describe their compact design without folding mirrors, which delivers high transmission, ease of alignment, and relatively low design and construction cost. We finally demonstrate that a similar design most likely can be implemented at EST but refer to a separate presentation describing the details of such TIS designs.

Fallon Konow

Session: High-Resolution ground-based telescopes and Technology for solar physics

89 views

Date of upload:

25.09.2023

Co-author:

Francesco Berrilli, Stuart M. Jefferies, Neil Murphy

Abstract:

We can deduce the magnetic and dynamic status of the Sun and its possible dependence on the magnetic cycle using continuous, multi-height observations of the solar atmosphere. Wwe describe the design and construction of a multi-nodal synoptic telescope network to observe the entire disk of the Sun. This network currently comprises of two instruments: the Tor Vergata Solar Synoptic Telescope (TSST) under construction at Università degli Studi di Roma Tor Vergata, to be mounted in La Palma, Canary Islands, Spain, and the Mojave Solar Observatory (MSO) located in Apple Valley California. This presentation focuses on the technical developments of the observatories themselves: the optical design of MOF-based telescopes, the mounting and enclosure of the TSST, the technological development of He-based MOFs, and the observing plan for the future of the multi-nodal network. Additionally, we present preliminary Doppler- and magnetogram observations from MSO.

Noelia Feijoo Amoedo

Session: High-Resolution ground-based telescopes and Technology for solar physics

71 views

Date of upload:

25.09.2023

Co-author:

Noelia Feijóo, Luzma Montoya, Nicolás Rodríguez, Yolanda Martín, Sergio Bonaque, Jose Manuel González, Haresh Chulani, Francisco González, Jorge Quintero, Miguel Núñez, Ángela Hernández

Abstract:

The European Solar Telescope (EST) is a 4.2-m telescope which has been redesigned with a fully integrated Multi-Conjugate Adaptive Optics (MCAO) into the optical path right after the EST primary mirror. The current baseline configuration considers four altitude Deformable Mirrors (DM) conjugated to 5, 9, 12 and 20 km above the telescope entrance pupil and an Adaptive Secondary Mirror (ASM) conjugated to the entrance pupil. The wavefront sensing will be performed by a set of correlation-based Shack Hartmann wavefront sensors (WFS). In order to validate the MCAO concept an optical bench demonstrator has been designed. It is currently working in Single Conjugated AO and Ground Layer AO and later it will evolve into the MCAO proposed for EST.

Roberta Forte

Session: Sun, Space and Society (solar physics impact on economy and society, data for 'civil ’society, education and outreach)

78 views

Date of upload:

25.09.2023

Co-author:

Raffaele Crapolicchio, Nicola Comparetti, Lorenzo Di Ciolo

Abstract:

SMOS (Soil Moisture and Ocean Salinity) is an ESA’s Earth Explorer Mission operating since 2009, providing observations of soil moisture and sea surface salinity, It carries on board a passive L-Band 2-D interferometric full polarization radiometer which, for its orbit geometry and antennae FoV, captures signals not only from the Earth but also from its surrounding sky, including the Sun. the SMOS data processor includes an algorithm to correct the impact of the direct L-band Sun signal inside the final image. But this signal can be used to derive the new Sun Brightness Temperature (BT) prototype products, proposed in this presentation, where we describe the algorithm derived to generate these products and their content, the algorithm set up for a radio burst detection bulletin, and the products validation. We also present current and future applications of these products as input for Earth science data, Ionosphere science modelling and Space Weather.

Sami Solanki

Session: Solar activity and its drivers

77 views

Date of upload:

26.09.2023

Co-author:

Sami K. Solanki, Tanayveer Bhatia, Robert Cameron, Emre Isik, Natalie A. Krivova, Timo Reinhold, Alexander Shapiro, K. Sowmya, Veronika Witzke

Abstract:

The Sun is a typical main sequence star with an outer convection zone, where a dynamo gives rise to magnetic fields that in turn produce magnetic features such as sunspots and faculae at the solar surface. During their presence at the solar surface the spots lead to a darkening, while the faculae produce a brightening. The evolution of the field and the rotation of the Sun results in variations in the Sun’s radiative output, which have been measured for over 4 decades. Such variations have now also been observed in myriads of cool main sequence stars thanks to the high accuracy of space missions such as Kepler, TESS and CHEOPS and in future PLATO. To properly understand and interpret these variations, models, simulations and techniques developed for this purpose for the Sun and solar variability turn out to be extremely useful. Particularly powerful has been a combination of models that - describe the rise of magnetic flux tubes through the convection zone, - determine their distrib

Martin Snow

Session: Solar activity and its drivers

71 views

Date of upload:

26.09.2023

Co-author:

W. E. McClintock, T. N. Woods, and J. Elliott (LASP)

Abstract:

The SOLar-STellar Irradiance Comparison Experiment (SOLSTICE) measured ultraviolet solar spectral irradiance with 0.1 nm spectral resolution on a daily basis from 2003-2020. This presentation summarizes the final data products and validation of the results.

Daniele GALLIENI

Session: High-Resolution ground-based telescopes and Technology for solar physics

67 views

Date of upload:

26.09.2023

Co-author:

Abstract:

We describe the deformable mirror technology we have developed over the past 30 years for nighttime astronomy and discuss the challenges now posed by its application to solar astronomy, with reference to the EST adaptive secondary mirror design.

Marianna Brigitta Korsos

Session: Solar activity and its drivers

85 views

Date of upload:

27.09.2023

Co-author:

Abstract:

The three-dimensional (3D) coronal magnetic field has not yet been directly observed. However, for a better understanding and prediction of magnetically-driven solar eruptions, 3D models of solar active regions are required. This work aims to provide insight into the significance of different 3D extrapolation models for flare prediction purposes, employing potential field (PF), linear force-free field (LFFF), nonlinear force-free field (NLFFF) models, and a neural network-based method integrating observational data and NLFFF physics. The 3D coronal magnetic field structure of a "flaring" (AR11166) and "flare-quiet" (AR12645) active region, in terms of their flare productivity, is constructed via the four extrapolation methods. To analyse the evolution of the field, six prediction parameters were employed throughout, from the photosphere up to the base of the lower corona.

Ferrente Fabiana

Session: Solar activity and its drivers

62 views

Date of upload:

28.09.2023

Co-author:

Carlos Quintero Noda, Francesca Zuccarello, Salvatore Luigi Guglielmino

Abstract:

Solar flares are a sudden release of energy in the Sun’s atmosphere, caused by the rapid reconnection of magnetic fields around sunspots. We present a multi-line spectropolarimetric study of a confined X1.6 flare that occurred in the large and complex active region AR12192 on October 22, 2014. We inverted the full IBIS (Interferometric BIdimensional Spectropolarimeter) map in Ca II 8542 A and Fe I 6173 A simultaneously using the DeSIRe (Departure coeffcient aided Stokes Inversion based on Response functions) code. We analyze the profiles and the atmospheric parameters obtained during the inversions. We are able to reproduce complex asymmetric profiles that are in absorption in Fe I line and in emission in Ca II line.

Serena Maria Lezzi

Session: Solar activity and its drivers

66 views

Date of upload:

28.09.2023

Co-author:

V. Andretta, M. Murabito, G. Del Zanna

Abstract:

We present the first characterization of the emission properties of a DH, the one around AR NOAA 12706, that includes chromospheric, Transition Region and coronal observations, by using IRIS spectra from full-disk mosaics and SDO/AIA filtergrams. We also analyze SDO/HMI magnetograms to study its average magnetic field properties. We find that the DH has an emission lower than the QS in all IRIS lines and in the cooler AIA wavebands. Our work also reveals that the DH shape has undergone a morphological transformation passing from the chromosphere to the corona. In addition, we found evidence that DHs and CHs exhibit different behaviors, suggesting they are distinct types of structures on the Sun.

Theodosios Chatzistergos

Session: Solar activity and its drivers

62 views

Date of upload:

30.09.2023

Co-author:

N. A. Krivova, I. Ermolli

Abstract:

Climate studies require long records of solar irradiance variations. Since direct irradiance measurements cover only limited time span, reconstructions of past irradiance variations are crucial. Such models require information on the evolution of solar surface magnetic field in the past, while information on facular regions prior to the period of direct irradiance measurements is scarce. As a result, reconstructions of past irradiance changes rely mainly on sunspot data, which requires certain assumptions about the relationship between sunspots and faculae. This has led to a discrepancy in estimates of long-term change in the solar irradiance. This issue can be resolved by utilising Ca II K observations, which is a largely unexplored dataset for irradiance reconstructions at the moment. We will discuss the potential of these data focusing in particular on the relationship between sunspots and Ca II K plage areas derived from a number of different Ca II K archives.

Marco Marongiu

Session: Solar activity and its drivers

75 views

Date of upload:

30.09.2023

Co-author:

A. Pellizzoni (INAF-OAC), S. Righini (INAF-IRA), M.N. Iacolina (ASI), S. Mulas (INAF-OAC), and the SunDish collaboration

Abstract:

In this talk we present our first results about the measure of the solar radius and the evidence of the coronal physical emission in the 18-26 GHz band (up to 100 GHz in perspective) with the large single-dish radio telescopes of the Italian National Institute for Astrophysics (INAF), throughout 5 years, from 2018 to early 2023. The coverage of the entire solar disk, the low noise, the accurate absolute calibration, and the great sensitivity of INAF radio telescopes make these data crucial to accurately observe the solar corona. Using about 300 radio solar maps obtained in the context of the SunDish project, devoted to the radio imaging and monitoring of the solar atmosphere through the INAF radio telescopes (Medicina 32-m and SRT 64-m), we describe our methods to calculate the solar radius and to prove the physical origin of the coronal emission; finally, we discuss and comparate our results with respect to the literature.

Giuseppina Nigro

Session: The Sun as a Rosetta Stone for astrophysics

109 views

Date of upload:

01.10.2023

Co-author:

Abstract:

In this contribution, we will present a simplified model for thermally driven dynamo developed using the shell technique. One result of the model is the enhancement of global heat transport before polarity reversals, indicating the critical role that heat transport can play in their occurrence. We have clarified this role by analysing a large set of numerical simulations of our dynamo model. In particular, convergent cross-mapping, a test assessing the presence and the strength of the causal connection between two variables in a nonlinear dynamical system, shows that an increase in the convective heat flux can cause the onset of polarity reversals. According to the idea of the critical role played by convective heat transport, the existing two branches of activity observed for low-mass, fast-rotating, fully convective stars may be explained in terms of the efficiency of global heat transport.

Marco Romoli

Session: Solar activity and its drivers

64 views

Date of upload:

02.10.2023

Co-author:

Metis Team

Abstract:

A solar coronagraph is a telescope equipped with an occultation system that allows the instrument to observe the solar corona by blocking the bright disk light. Although ground based coronagraphs do exist, they have to struggle with the sky brightness, that limits the operability of the instrument and its field of view. Space coronagraphs have flown since the OSO missions in the sixties till the current presence in space of several assets that image the solar corona from different point of views. A coronagraph explores the region where the solar wind is accelerated and where the most dramatic evolution of coronal transients like CMEs and prominence eruptions takes place. Observations in the UV increase the science return of such instruments. The Metis coronagraph on board Solar Orbiter provides for the first time simultaneous ultraviolet and visible light images of the solar corona, allowing to apply the Doppler dimming technique and retrieve the wind velocity on the plane of the sky.

David MacTaggart

Session: Solar activity and its drivers

59 views

Date of upload:

05.10.2023

Co-author:

Abstract:

We seek signatures of topological measures, such as helicity and winding, that can indicate flares and CMEs several hours before their onset

Manuel Collados

Session: Solar activity and its drivers

55 views

Date of upload:

05.10.2023

Co-author:

The EST Team

Abstract:

The present status and perpectives of EST are described.

Manuel Collados

Session: Solar activity and its drivers

67 views

Date of upload:

05.10.2023

Co-author:

The EST Team

Abstract:

The present status and future perpectives of EST are presented

Serena Criscuoli

Session: The Sun as a Rosetta Stone for astrophysics

71 views

Date of upload:

06.10.2023

Co-author:

S. Marchenko, M.T. DeLand, D. Choudary, G. Kopp

Abstract:

We investigate the variability of solar Balmer lines (H-α, -β, -γ, -δ) from space-borne radiometers (OSIRIS, SCIAMACHY, OMI, GOME-2) and ground-based NSO/ISS spectrograph data, linking the observed changes to the solar disk's magnetic features. On solar-rotational timescales (about 1 month), the Balmer-line activity indices (defined as line-core to line-wing ratios) closely follow variations in the total solar irradiance (which is predominantly photospheric), thus frequently (specifically, during passages of sunspot groups) deviating from behavior of activity indices that track chromospheric activity levels. On longer timescales, the correlation with chromospheric indices increases, with periods of low- or even anti-correlation found at intermediate (months to years) timescales. Comparison of these observations with estimates from semi-empirical irradiance reconstructions helps quantify the contributions of different magnetic and quiet features. We conclude that both the lower sensitiv

Consuelo Cid

Session: Solar activity and its drivers

70 views

Date of upload:

06.10.2023

Co-author:

Abstract:

Space weather science is evolving fast, but many open questions remain. A good knowledge of solar precursors is a mandatory requirement for predicting space weather hazards well in advance. Solar observations from existing capabilities, mainly from space telescopes, are being extensively analysed even involving artificial intelligence. Nevertheless, the response to what triggers an eruptive flare instead a confined one, or to what will be the direction of the magnetic field vector when a coronal mass ejection arrives the Earth, among other questions, is missing nowadays. Next generation 4m telescopes provide a significant increase in observing capability, which should allow us to go ahead in the understanding of space weather science, increasing our forecasting capabilities. However, some changes should be made to achieve this goal, for example, in the observing schedules.

Maria Pia Di Mauro

Session: The Sun as a Rosetta Stone for astrophysics

73 views

Date of upload:

06.10.2023

Co-author:

Raffaele Reda, Luca Giovannelli, Francesco Berrilli

Abstract:

We present our new synergic strategy that merges the potential of asteroseismology with solar space climate techniques in order to characterize solar-like stars and their interaction with hosted exoplanets. The method is based on the use of seismic data obtained by the space missions Kepler/K2 or TESS Transiting Exoplanet Survey Satellite, coupled with stellar activity estimates deduced from ground-based campaigns. Our investigation allows us to obtain not only a highly accurate characterization of the mother star and its orbiting planet but also to study the stellar magnetic activity and the star-planet interaction in analogy to the Sun-Earth system allowing t determine the extension of the exoplanetary magnetosphere. This information, coupled with the precise age estimation by asteroseismology determines how long an atmosphere could resist the action of stellar wind, directly quantifying the portion of the atmosphere that could be eroded.

Javier Trujillo Bueno

Session: The Sun as a Rosetta Stone for physics

69 views

Date of upload:

08.10.2023

Co-author:

Abstract:

The magnetic field is the main driver of the spectacular activity of the upper solar atmosphere, including the eruptive phenomena that determine the near-Earth space weather. For this reason, one of the great challenges of astrophysics is the empirical investigation of the magnetic fields that permeate the solar atmosphere. Recent advances in our theoretical understanding of the fingerprints that photospheric, chromospheric and coronal magnetic fields leave in the solar spectrum, as well as in the development of the instrumentation needed to measure the key observables, are activating a new revolution in solar physics. Here I provide a personal view of some recent advances, such as predictions on the polarization in some spectral lines (to be confirmed by DKIST and/or EST), the solution of a long-standing paradox in solar physics, and the inference of chromospheric magnetic fields from the unprecedented ultraviolet spectropolarimetric observations enabled by the CLASP suborbital space experiments. All these novel investigations show clearly that the solar atmosphere represents a unique laboratory for improving our understanding of the physics of atom-photon interactions in astrophysical plasmas.

Tiago Pereira

Session: The Sun as a Rosetta Stone for astrophysics

66 views

Date of upload:

16.10.2023

Co-author:

Abstract:

Detailed radiative transfer calculations are essential for accurately interpreting spectra, both in solar and stellar astrophysics. The gold standard in spectral synthesis are 3D NLTE calculations, which take advantage of more realistic 3D model atmospheres and account for non-equilibrium physics (NLTE). Over the last decade, 3D NLTE calculations went from a niche to the mainstream. Solar studies have greatly helped in this transition, in two fundamental ways: by developing numerical schemes to make the 3D NLTE problem computationally tractable, and by using our closest star as a detailed laboratory to constrain atomic data and physical assumptions. The repercussions of 3D NLTE analyses in cool stars are profound. I will review a few results, including the revised solar chemical composition and stellar abundances, and finish with an eye on the future, from advances from large spectroscopic surveys, exoplanets, and stellar chromospheres.

ilaria ermolli

Session: High-Resolution ground-based telescopes and Technology for solar physics

74 views

Date of upload:

17.10.2023

Co-author:

Ermolli, R. Cirami, G. Calderone, D. Del Moro, P. Romano, G. Viavattene, M. Aliverti, V. Baldini, F. Giorgi, F. Pedichini, I. Coretti, P. Di Marcantonio, L. Giovannelli, S. Guglielmino, M. Murabito, L. Oggioni, M. Oliviero, R. Piazzesi, E. Redaelli From 09/2023: S. Bertocco, S. Kamal, G. Mainella

Abstract:

The IBIS Interferometric BIdimensional Spectrometer, disassembled from the US Dunn Solar Telescope in 2019, is undergoing a significant hardware and software upgrade in light of its new installation as IBIS 2.0 in the Canary Islands. We present the instrumental characteristics and the design of the refurbished instrument. IBIS 2.0 will allow acquiring new spectropolarimetric observations of the solar atmosphere at high spatial, spectral and temporal resolution in coordination with telescopes onboard the Solar Orbiter, Bepi-Colombo, and SOLAR-C missions and other ground-based instruments. We also describe the future steps towards the operation of IBIS 2.0 as a key resource for the Space Weather science.

Sanjay Gosain

Session: Sun, Space and Society

49 views

Date of upload:

02.11.2023

Co-author:

Abstract:

We study the temperature structure of chromospheric network fibrils using high- resolution observations from DKIST telescope. These first public release observations provide simultaneous photospheric and chromospheric spectra at high angular resolution. We use LTE and NLTE diagnostics to infer the temperature stratification in the fibrils and compare it with numerical simulations such as BIFROST.

Valentina Penza

Session: Solar activity and its drivers

68 views

Date of upload:

25.09.2023

Co-author:

F. Berrilli, L. Bertello, M. Cantoresi, S. Criscuoli

Abstract:

Reconstruction of the Total Solar Irradiance (TSI) over past epochs requires the evaluation of two major temporal components of solar activity: the quasi-cyclical component due to the 11-year sunspot cycle and the long-term component. We present here an empirical method to separate these components and to estimate the levels of the TSI during the last five centuries, an important information for global or regional climatology studies. We used available historical records of active region area coverage, reproduced by a functional form, and a time series of the Solar Modulation Potential to which we apply the Hilbert-Huang empirical mode decomposition (EMD) algorithm. The main finding of our study is that the estimated TSI values during the Maunder minimum and the present epoch differ by ~ 2.5 W/m2. By using this approach, we are also able to forecast the area coverage of active regions for solar cycle 25.

Szabolcs Soós

Session: Solar activity and its drivers

70 views

Date of upload:

26.09.2023

Co-author:

J. Liu (刘佳佳), M. B. Korsós, R. Erdélyi

Abstract:

The focus of this study is on the spatial and temporal distributions of 2704 solar jets throughout Solar Cycle 24, from beginning to end. This work is a follow up paper of Liu et al. (2023). With this extended dataset, we have further confirmed the two distinct distributions of coronal jets: one located in polar regions and another at lower latitudes. Further analysis of the series of coronal jets revealed kink oscillations of the global solar magnetic field. Additionally, studying the northern and southern hemispheres separately showed an anti-phase correlation that can be interpreted as a global sausage oscillatory pattern of the locii of the coronal jets. We also investigated how the variability of the solar cycle may impact the power law index of coronal jets by dividing the dataset into the rising and declining phases of Solar Cycle 24. Finally, we searched for compelling signatures of the presence of active longitude in the coronal jet database.

Serena Maria Lezzi

Session: Solar activity and its drivers

61 views

Date of upload:

28.09.2023

Co-author:

F. Ferrente, M. Murabito, S. Guglielmino, F. Zuccarello, V. Andretta, I. Ermolli, P. Romano, D. Spadaro, C. Sasso, F. Giorgi

Abstract:

The most conspicuous manifestation of solar magnetism is the emergence of active regions (ARs) in the solar atmosphere. They appear as sunspots and facular regions at the photosphere and also involve all the overlying atmospheric layers. Despite our overall knowledge about the AR formation and evolution, the understanding of a number of fine details of these processes are still missing. In order to investigate aspects related to the AR emergence using high-resolution spectroscopic and spectropolarimetric observations, we have been awarded 10 days of observing time (31 July - 9 August 2023) at the GREGOR solar telescope. In our poster, we will show a preview of the observed targets, relevant to the above mentioned research topics. We will also present coordinated observations taken with Hinode and IRIS.

There are no uploaded papers yet.