Posters

@conference{riva2021_ESPM16,

title = {Methodology for estimating the magnetic Prandtl number and application to solar surface small-scale dynamo simulations},

author = {F. Riva and O. Steiner},

url = {http://www.irsol.usi.ch/wp-content/uploads/2022/02/Riva_ESPM16.pdf},

year  = {2021},

date = {2021-09-06},

urldate = {2021-09-06},

booktitle = {16th European Solar Physics Meeting (ESPM-16)},

abstract = {Context. A crucial step in the numerical investigation of small-scale dynamos in the solar atmosphere consists of an accurate determination of the magnetic Prandtl number, Prm, stemming from radiative magneto-hydrodynamic (MHD) simulations.

Aims: The aims are to provide a reliable methodology for estimating the effective Reynolds and magnetic Reynolds numbers, Re and Rem, and their ratio Prm = Rem/Re (the magnetic Prandlt number), that characterise MHD simulations and to categorise small-scale dynamo simulations in terms of these dimensionless parameters.

Methods: The methodology proposed for computing Re and Rem is based on the method of projection on proper elements and it relies on a post-processing step carried out using higher order accurate numerical operators than the ones in the simulation code. A number of radiative MHD simulations with different effective viscosities and plasma resistivities were carried out with the CO5BOLD code, and the resulting growth rate of the magnetic energy and saturated magnetic field strengths were characterised in terms of Re and Rem.

Results: Overall, the proposed methodology provides a solid estimate of the dissipation coefficients affecting the momentum and induction equations of MHD simulation codes, and consequently also a reliable evaluation of the magnetic Prandtl number characterising the numerical results. Additionally, it is found that small-scale dynamos are active and can amplify a small seed magnetic field up to significant values in CO5BOLD simulations with a grid spacing smaller than h = 12 km, even at Prm ≃ 0.65. However, it is also evident that it is difficult to categorise dynamo simulations in terms of Prm alone, because it is not only important to estimate the amplitude of the dissipation coefficients, but also at which scales energy dissipation takes place. },

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Capozzi2018,

title = {Feasibility study for a dedicated filter based polarimeter system for large  telescopes: comparing two different cameras},

author = {E. Capozzi and S. K. Dahara and D. Gisler and M. Bianda and R. Ramelli},

url = {http://www.irsol.usi.ch/wp-content/uploads/2019/05/poster_cameras_capozzi18.pdf},

year  = {2018},

date = {2018-10-31},

booktitle = {SoHe3 Meeting},

address = {Torino},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{steiner2018_SAMI,

title = {On flux tubes and irradiance: reminiscences and news},

author = {Steiner, O.},

url = {http://www.irsol.usi.ch/wp-content/uploads/2019/10/steiner2018_SAMI.pdf},

year  = {2018},

date = {2018-10-16},

booktitle = {Solar Activity, Irradiance, and Magnetism (SAMI18) (The conference in honor of Sami K. Solanki)},

address = {Max-Plank-Institut für Sonnensystemforschung, Göttingen},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{janett+al_canary_school,

title = {Formal Solutions for the Polarized Radiative Transfer Equation},

author = {G. Janett and O. Steiner and L. Belluzzi},

url = {http://www.irsol.usi.ch/wp-content/uploads/2018/05/poster_tenerife.pdf},

year  = {2017},

date = {2017-11-13},

booktitle = {Applications of radiative transfer to stellar and planetary atmospheres},

series = {XXIX Canary Islands Winter School of Astrophysics:},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{calvo+al_PASC17,

title = {The linear polarization of the solar continuum radiation from numerical simulations of the solar atmosphere},

author = {F. Calvo and O. Steiner and J. Štěpán},

url = {http://www.irsol.usi.ch/wp-content/uploads/2018/05/pasc17_LD.pdf},

year  = {2017},

date = {2017-06-26},

organization = {Platform for Advanced Scientific Computing Conference, Lugano},

series = {PASC 17},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{janett+steiner_PASC16,

title = {Polarized Radiative Transfer in Stellar Atmospheres},

author = {G. Janett and O. Steiner},

url = {http://www.irsol.usi.ch/wp-content/uploads/2018/05/gioele_janett_poster_PASC.pdf},

year  = {2016},

date = {2016-06-08},

organization = {Platform for Advanced Scientific Computing Conference, Lausanne},

series = {PASC 16},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Calvo2015b,

title = {3-D radiation magnetohydrodynamics simulations of the near surface layers of the Sun},

author = {Calvo, F. and Steiner, O. and Freytag, B.},

url = {https://www.irsol.usi.ch/data/Poster/PASC15_poster1.pdf},

year  = {2015},

date = {2015-06-03},

address = {Zürich},

organization = {Platform for Advanced Scientific Computing Conference},

series = {PASC 15},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Steiner2015b,

title = {Polarized radiative transfer in discontinuous media},

author = {Steiner, O. and Züger, F. and Belluzzi, L.},

url = {https://www.irsol.usi.ch/data/Poster/PASC15_poster2.pdf},

year  = {2015},

date = {2015-06-03},

address = {Zürich},

organization = {Platform for Advanced Scientific Computing Conference},

series = {PASC 15},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Ramelli2015,

title = {Synoptic program to measure the evolution of the photospheric hidden magnetic field during a solar cycle},

author = {Ramelli, R. and Bianda, M. and Berdyugina, S. and Kleint, L. and Goroberts, A. and Stenflo, J.O. and Belluzzi, L.},

url = {https://www.irsol.usi.ch/data/Poster/poster_syn.pdf},

year  = {2015},

date = {2015-01-01},

booktitle = {IAU General Assembly},

volume = {Meeting 29},

number = {2257074},

address = {Honolulu},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Setzer2015,

title = {Atlas of the center to limb variation of the solar intensity spectrum},

author = {Setzer, M. and Engelhard, M. and Ramelli, R. and Stenflo, J.O. and Bianda, M. and Küveler, G. and Plewe, R.},

url = {https://www.irsol.usi.ch/data/Poster/poster_CLV.pdf},

year  = {2015},

date = {2015-01-01},

booktitle = {IAU General Assembly},

volume = {Meeting 29},

number = {2256989},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Ramelli2014,

title = {First successful deployment of the ZIMPOL-3 system at the GREGOR telescope},

author = {Ramelli, R. and Gisler, D. and Bianda, M. and Bello González, N. and Berdyugina, S. and Soltau, D.},

url = {https://www.irsol.usi.ch/data/poster-ramelli-spie14.pdf},

year  = {2014},

date = {2014-06-27},

booktitle = {SPIE conference on Astronomical Telescopes + Instrumentation 2014},

address = {Montréal, Quebec, Canada},

series = {SPIE conference proceedings},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Ramelli2013b,

title = {Spectropolarimetry with ZIMPOL-3 at the IRSOL observatory},

author = {Ramelli, R. and Bianda, M.},

url = {https://www.irsol.usi.ch/data/Poster/poster-rodi.pdf},

year  = {2013},

date = {2013-09-16},

booktitle = {13th European Solar Physics Meeting},

address = {Rhodos, Greece},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Setzer2013b,

title = {Computersteuerung für einen Sonnenspektrografen.},

author = {Setzer, M. and Lübke, S. and Küveler, G. and Zuber, A. and Bianda, M. and Ramelli, R.},

url = {https://www.irsol.usi.ch/data/Poster/spectro_poster.pdf},

year  = {2013},

date = {2013-03-01},

booktitle = {Posterpräsentation im Rahmen des 10. fachwissenschaftlichen Kolloquiums “Angewandte Automatisierungstechnik in Lehre und Entwicklung” (AALE 2013)},

address = {Fachhochschule Stralsund},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Ramelli2010b,

title = {Adaptive optics system for the IRSOL solar observatory},

author = {Ramelli, R. and Bucher, R. and Rossini, L. and Bianda, M. and Balemi, S.},

url = {https://www.irsol.usi.ch/data/Poster/ao-poster.pdf},

year  = {2010},

date = {2010-01-01},

booktitle = {SPIE conference “Telecopes and Instrumentation 2010”},

address = {San Diego, USA},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Kleint2008,

title = {Synoptic program - Variations of the Turbulent magnetic field},

author = {Kleint, L. and Berdyugina, S. and Bianda, M.},

editor = {Peter, H.},

url = {https://www.irsol.usi.ch/data/Poster/poster_espm_v5.pdf

http://adsabs.harvard.edu/abs/2008ESPM...12.2.71K},

year  = {2008},

date = {2008-09-12},

booktitle = {12th European Solar Physics Meeting},

volume = {12},

pages = {2.71},

address = {Freiburg, Germany},

series = {European Solar Physics Meeting},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Ramelli2005b,

title = {Spectropolarimetry of Solar Prominences”},

author = {Ramelli, R. and Bianda, M. and Trujillo Bueno, J. and Merenda, L. and Stenflo, J.O.},

url = {https://www.irsol.usi.ch/data/Poster/boulder-ramelli05.pdf},

year  = {2005},

date = {2005-09-23},

booktitle = {4th Solar Polarization Workshop},

address = {Boulder, Colorado, USA},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Ramelli2005bb,

title = {Spectropolarimetric Observations of Prominences and Spicules},

author = {Ramelli, R. and Bianda, M. and Trujillo Bueno, J. and Merenda, L. and Stenflo, J.O.},

url = {https://www.irsol.usi.ch/data/Poster/lindau-ramelli05.pdf},

year  = {2005},

date = {2005-09-02},

booktitle = {Conference on “Chromospheric and Coronal Magnetic Fields”},

address = {Katlenburg-Lindau, Germany},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}

@conference{Küveler2003b,

title = {Automatic Guiding of Solar Gregory Telescopes},

author = {Küveler, G. and Wiehr, E. and Bianda, M.},

url = {https://www.irsol.usi.ch/data/Poster/pig-poster.pdf

},

year  = {2003},

date = {2003-01-01},

booktitle = {2002 Tagung “From the Gregory-Coude Telescope to GREGOR"},

address = {Göttingen},

keywords = {},

pubstate = {published},

tppubtype = {conference}

}