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Dynamo Thinkshops

4th Dynamo Thinkshop Free Conference is closed

Conference is closed

thinkshop2019

Hosted by SOLARNET - High Resolution Solar Physics Network

Affiliation Leibniz-Institut für Sonnenphysik

Aula Gassano, Rom, Italy

25.11.2019 - 26.11.2019

Organizing institutions

Dipartimento di Fisica Università degli Studi di Roma Tor Vergata

Main category Natural Sciences (Astrophysics and Astrononmy)

Conference/Workshop objectives

The workshop format, since its first edition, aims at encouraging free and relaxed discussion over topics in Solar/Stellar Dynamo, notably revolving around possible links between planetary tides and the Solar Cycle, evidences from paleocosmic ray records, solar data, theoretical matters and models.

Participants:

Carlo Albert Swiss Federal Institute of Aquatic Science and Technology, Switzerland

Alessandra Ambrifi Dept. of Physics, Univ. Rome Tor Vergata, Italy

Svetlana Berdyugina Leibniz-Institut fuer Sonnenphysik (KIS), Germany

Francesco Berrilli Dept. of Physics, Univ. Rome Tor Vergata, Italy

Juerg Beer Swiss Federal Institute of Aquatic Science and Technology, Switzerland

Robero Benzi Dept. of Physics Univ. Rome Tor Vergata, Italy

Alberto Bigazzi Dept. of Physics Univ. Rome Tor Vergata, Italy

Giuseppe Consolini INAF-IAPS, Italy

Dario Del Moro Dept. of Physics, Univ. Rome Tor Vergata, Italy

Andre Giesecke Helmholtz-Zentrum Dresden-Rossendorf, Germany

Luca Giovannelli Dept. of Physics Univ. Rome Tor Vergata, Italy

Antonio Ferriz Mas Univ. Vigo, Spain

Valentina Penza Dept. of Physics Univ. Rome Tor Vergata, Italy

Ermanno Pietropaolo Univ. Di L’Aquila, Italy

Rafael Rebolo Instituto de Astrofísica de Canarias, Spain

Markus Roth Leibniz-Institut fuer Sonnenphysik (KIS), Germany

Martin Seilmayer Helmholtz-Zentrum Dresden-Rossendorf, Germany

Frank Stefani Helmholtz-Zentrum Dresden-Rossendorf, Germany

Rodion Stepanov Institute of Continuos Media Mechanics, Russia

Simone Ulzega Swiss Federal Institute of Aquatic Science and Technology, Switzerland

José Manuel Vaquero Universidad de Extremadura, Spain

Tom Weier Helmholtz-Zentrum Dresden-Rossendorf, Germany

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Local organizing committee

Berrilli F. (chair) , Bigazzi A., Del Moro D., Ferriz Mas A., Giovannelli L., Pietropaolo E.

Scientific organizing committee (SOC)

Francesco Berrilli
Antonio Ferriz Mas

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Sessions

Dynamo
Long-Term Solar Variability

Programme

Invited speakers

tba

Preliminary Program:

Monday 25th of November

9:45 Registration and coffee

10:15 Welcome (A. Bigazzi)

Session Dynamo
10:30 Stochastic Resonance in complex systems, R. Benzi
11:00 Schwabe, Gleissberg, Suess-de Vries: A simple model for synchronizing solar cycles by planetary forces F. Stefani, A. Giesecke, M. Seilmayer, T. Weier
11:40 Can stochastic resonance explain the amplification of planetary tidal forcing? C. Albert and S. Ulzega
12:10 Baysian inference methods for the calibration of stochastic dynamo models S. Ulzega and C. Albert

12:40 Lunch

14:00 Synchronization in mean field dynamo models and precessing flows A. Giesecke, M. Seilmayer, F. Stefani, T. Weier
14:30 Solar magnetic variability: main period and other periods; where do they come from? A. Ferriz Mas
15:00 Synchronization and dynamic quenching in a simple model of alpha-omega-dynamo R. Stepanov
15:30 Large-scale Dynamo vs Small-scale Dynamo G. Nigro, F. Cattaneo and S.M. Tobias

16:00 Coffee break

16:15 Signal-to-Noise Resonance in Geomagnetic Polarity Reversals G. Consolini
16:45 Helioseismology of Solar Rotation, M. Roth
17:15 Discussion

20:00 Social Dinner in Trastevere

Tuesday 25th of November

Session Long-Term Solar Variability
10:00 Long-term (1749-2015) variations of solar UV spectral indices, Berrilli F., Criscuol S.i, Lovric M., Penza V.
10:30 Challenges and limitations of the long-term sunspot-number record, José M. Vaquero
11:00 Annual information on solar cycles from tree rings and ice cores, Jürg Beer
11:30 Historical TSI reconstruction from Solar Modulation Data, Penza V., Berrilli F., Criscuoli S.
12:00 A model for Earth's climate sensitivity to solar irradiance variations, R. Reda, F. Lepreti, L. Primavera, A.Vecchio.
12:30 Wavelet analysis of the phase locking effect in the real and simulated data of solar activity D. Sekulov
12:45 Discussion

13:00 End of Thinkshop

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Download abstract book

Important dates

The meeting will start on Monday, November 25, 2019, at 10:00.

Registration and payment information

No fee required to attend, simply register for the meeting.

Conference venue

Dipartimento di Fisica

Università degli Studi di Roma Tor Vergata

Aula Grassano

Hotel information

Rome is a very touristic city and there is a very big offer of hotels and apartments. You can check at any booking site and choose your hotel. However, I will propose you a short list of hotel which have reasonable prices and are close to the metro A stops which take you to the university.

Check in 24/11 – Check out 26/11

Exe International Palace****
Via Nazionale
60 Euros per night without breakfast
68 Euros per night with breakfast

Hotel Mondial****
Via Torino
49 Euros per night without breakfast

Mercure Roma Centro Colosseo****
Via Labicana
90 Euros per night without breakfast
98 Euros per night with breakfast

If you are interested, you can write to Eman (eman@eurekatravel.it) in order to have support and book/pay in advance one the listed hotels.

Travel information

There are no uploaded videos yet.

Giuseppina Nigro

Session: Dynamo

701 views

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 (typical 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 complementary 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 discriminated. 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.

Frank Stefani

Session: Dynamo

649 views

Date of upload:

27.11.2019

Co-author:

A. Giesecke, M. Seilmayer, R- Stepanov. T. Weier

Abstract:

Aiming at a consistent planetary synchronization model of both short-term and long-term solar cycles, we start with an analysis of Schove's historical data of cycle maxima. Their deviations (residuals) from the average cycle duration of 11.07 years show a high degree of regularity, comprising a dominant 200-year period (Suess-de Vries cycle), and a few periods around 100 years (Gleissberg cycle). Encouraged by their robustness, we support previous forecasts of an upcoming grand minimum in the 21st century. To explain the long-term cycles, we enhance our tidally synchronized solar dynamo model by a modulation of the field storage capacity of the tachocline with the orbital angular momentum of the Sun, which is dominated by the 19.86-year periodicity of the Jupiter-Saturn synodes. This modulation of the 22.14 years Hale cycle leads to a 193-year beat period of dynamo activity which is indeed close to the Suess-de Vries cycle. For stronger dynamo modulation, the model produces additional peaks at typical Gleissberg frequencies, which seem to be explainable by the non-linearities of the basic beat process, leading to a bi-modality of the Schwabe cycle. However, a complementary role of beat periods between the Schwabe cycle and the Jupiter-Uranus/Neptune synodic cycles cannot be completely excluded.

Simone Ulzega

Session: Dynamo

602 views

Date of upload:

27.11.2019

Co-author:

Carlo Albert

Abstract:

In essentially all applied sciences, data-driven modeling heavily relies on a sound calibration of model parameters to measured data for understanding the underlying mechanisms that lead to observed features. Solar dynamo models are no exception. Bayesian statistics is a consistent framework for parameter inference where knowledge about model parameters is expressed through probability distributions and updated using measured data. However, Bayesian inference with non-linear stochastic models can become computationally extremely expensive and it is therefore hardly ever applied. In recent years, sophisticated and scalable algorithms have emerged, which have the potential of making Bayesian inference for stochastic models feasible. We investigate the power of Approximate Baysian Computation (ABC), enhanced by Machine Learning methods, and Hamiltonian Monte Carlo algorithms applied to solar dynamo models.

Carlo Albert

Session: Dynamo

567 views

Date of upload:

02.12.2019

Co-author:

Abstract:

There are no uploaded posters yet.

There are no uploaded papers yet.

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