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Astrophysics and Astrononmy
SOLARNET kick-off WP9
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
31.01.2019
Abstract:
Presentation of WP9 at the SOLARNET kick-off meeting
The EST Governance Structure
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
09.10.2017
Abstract:
In the coming four years the governance structure for the European Solar Telescope (EST) needs to be defined. For this various governance models for multi-national collaborations need to be studied.
In this presentation I will define the important steps to arrive at the EST governance structure. These steps follow general principles to define organizational models. Furthermore, the requirements already defined by the EU in form of practical guidelines for defining the legal framework for a consortium operating such an infrastructure and the European Charter for Access to Research Infrastructures will be reviewed.
WP7 Multi-Conjugate Adaptive Optics for EST
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
31.01.2019
Abstract:
Presentation of WP7.
Magnetic sensitivity of the scattering polarization signals in the wings of the Ca I line at $4227$ angstrom
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
17.07.2018
Co-author:
Luca Belluzzi; Istituto Ricerche Solari Locarno (IRSOL), Switzerland \\ Javier Trujillo Bueno; Instituto de Astrofísica de Canarias (IAC), Spain
Abstract:
The scattering polarization signal of the Ca I line at $4227$ angstrom shows a peculiar triple-peak profile, with a sharp peak in the line core and broader peaks in the wings. This structure is due to frequency coherence in line scattering processes and cannot be modeled under the assumption of complete redistribution in frequencies (CRD). Since the Hanle effect operates in the line core region only, it has generally been thought that the amplitude of the scattering polarization wing lobes is insensitive to the presence of weak magnetic fields. However, recent theoretical investigations have shown that such wing lobes are in fact sensitive to the magnetic field through another physical mechanism, namely the magneto-optical (MO) effects that rotate the plane of linear polarization as radiation propagates through the solar atmosphere. Here, the expected signatures of such mechanism are discussed, focusing on the implications for magnetic field diagnostics in quiet or weakly magnetized regions of the solar atmosphere.
The EST Capabilities
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
21.09.2018
Abstract:
The EST Capabilities
SOLARNET kick-off WP2
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
31.01.2019
Abstract:
Presentation of WP2 in SOLARNET
IBIS-A The IBIS data Archive
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
16.12.2020
Co-author:
Fabrizio Giorgi, Mariarita Murabito, Giorgio Viavattene, Paolo Romano, Salvatore L. Guglielmino, Silvio Giordano, Antonio Volpicelli, Alessandro Marassi, Vincenzo Guido, Francesca Zuccarello
Abstract:
The IBIS data Archive (IBIS-A) contains data acquired with the Interferometric BIdimensional Spectropolarimeter (IBIS), the imaging spectro-polarimeter based on a dual Fabry-Perot interferometric system that was operated at the focal plane of the Dunn Solar Telescope (DST) of the National Solar Observatory (NSO) from June 2003 to June 2019. Current total volume of IBIS-A is 19 TB of L0 and 3 TB of L1 data from observations performed on 152 days from 2012 to 2019.
Large-scale Dynamo vs Small-scale Dynamo
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
25.11.2019
Co-author:
Fausto Cattaneo, Steve Tobias
Abstract:
Very often the magnetic dynamo reveals itself with a natural tendency of the plasma to self- organize into coherent structures which show characteristic spatial and temporal scales larger than the ones of the underling turbulence. This tendency for self-organization into large structures (typ- ical size of the order of the astrophysical object) has led to the development of the well known large-scale dynamo theory. This theory has represented for more than 50 years an approach com- plementary to the small-scale dynamo theory.
The aim of this contribution is to understand the relationship between dynamo action and large- scale dynamo mechanism, and to question whether or not the two approaches need to be discrimi- nated. The discussion is based on numerical studies of dynamo action in the kinematic regime at high Rm for flows consisting of shear and a helical flow in which the helicity and the strength of the shear can be controlled. The analysis of the numerical results shows that, for some choice of these parameters, the overwhelming small-scale magnetic structures hide the large-scale traveling dynamo waves. This might lead to possible misinterpretation in terms of small-scale dynamo action as a different mechanism than the one generating the large-scale dynamo.
The Next-Generation Ground based solar Observing Network (ngGONG)
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
20.02.2021
Co-author:
Alfred G. de Wijn, Holly Gilbert, Valentin M Pillet
Abstract:
We provide a brief overview of the next-generation GONG network.
Coordinated solar observations with ALMA: Issues, constraints, how to plan them - an ALMA-centric view
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
16.12.2020
Co-author:
Czech EU ARC-node team, Tim Bastian (NA ARC), Masumi Shimojo (EA ARC)
Abstract:
This presentation brings a brief overview of the topic of coordinated joint solar observations involving ALMA, large European solar optical facilities and space-born missions. Constraints on various time-scales of the project preparation and execution are mentioned and examined. The presentation summarizes guidelines for proposers aiming at joint high-resolution solar observations involving ALMA observatory.
Coordination of development of software tools for solar physics
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
16.12.2020
Co-author:
Colleagues from SU, UiO, QUB, ASU, Aperio
Abstract:
WP2.2.3. is about the coordination of development of software tools for solar physics. An inventory will be made for the needs, availability, and future desired directions of computational, visualisation & analysis tools. Together with ongoing discussions this will direct the activities in WP5.
Profile Analysis: Retrieval of physical parameters
Natural Sciences (Astrophysics and Astrononmy)
Date of upload:
08.12.2020
Abstract:
What can we learn from studying Stokes profiles without doing inversions?
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