0482423 - ASÚ 2018 RIV FR eng J - Journal Article
Siu-Tapia, A. - Lagg, A. - Solanki, S.K. - van Noort, M. - Jurčák, Jan
Normal and counter Evershed flows in the photospheric penumbra of a sunspot SPINOR 2D inversions of Hinode-SOT/SP observations.
Astronomy & Astrophysics. Roč. 607, November (2017), A36/1-A36/17. ISSN 0004-6361. E-ISSN 1432-0746
Institutional support: RVO:67985815
Keywords : sunspots * photosphere * magnetic fields
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.565, year: 2017

Here we present a rare feature observed in the penumbra of the main sunspot of AR NOAA 10930. This spot displays the normal Evershed outflow in most of the penumbra, but harbors a fast photospheric inflow of material over a large sector of the disk-center penumbra. We investigate the driving forces of both, the normal and the counter Evershed flows. We invert the spectropolarimetric data from Hinode SOT/SP using the spatially coupled version of the SPINOR inversion code, which allows us to derive height-dependent maps of the relevant physical parameters in the sunspot. These maps show considerable fine structure. Similarities and differences between the normal Evershed outflow and the counter Evershed flow are investigated.


Permanent Link: http://hdl.handle.net/11104/0277832