New Insights on Penumbra Magneto-Convection

0552737 - ASÚ 2022 RIV US eng C - Conference Paper (international conference)
Bello González, N. - Jurčák, Jan - Schlichenmaier, R. - Rezaei, R.
New Insights on Penumbra Magneto-Convection.
Solar Polarization Workshop 8. San Francisco: Astronomical Society of the Pacific, 2019 - (Belluzzi, I.), s. 261-269. ASP Conference Series, 526. ISBN 978-1-58381-939-5. E-ISSN 1050-3390.
[Solar Polarization Workshop 8. Florence (IT), 12.09.2016-16.09.2016]
R&D Projects: GA ČR(CZ) GA14-04338S
Institutional support: RVO:67985815
Keywords : penumbra * observations * modelling
OECD category: Astronomy (including astrophysics,space science)

In July 2009, we observed the early stages of the NOAA 11024 AR leading sunspot while developing its penumbra. The spectro-polarimetric dataset lead us to new observational findings. In this contribution, we put into context our and other authors' results to draw the overall picture of sunspot formation. Most important, the comparison on the properties of different types of penumbrae lead us to the conclusion that the formation of penumbrae is not just one mechanism. While the sole cause necessary for penumbral magneto-convection is a stably inclined magnetic field, observations show that inclined fields can be caused by flux emergence, to form orphan penumbrae, or by field lines transported down from upper photospheric layers, to form sunspot penumbra. This conclusion, together with the recent findings by Jur\čák and collaborators on a canonical value of the vertical component of the magnetic field blocking the action of penumbral magneto-convection in umbral areas, is a crucial step forward towards the understanding of the coupling of solar plasmas and magnetic fields in penumbral atmospheres.
Permanent Link: http://hdl.handle.net/11104/0327867