Active region fine structure observed at 0.08 arcsec resolution

0488881 - ASÚ 2018 RIV FR eng J - Journal Article
Schlichenmaier, R. - von der Lühe, O. - Hoch, S. - Soltau, D. - Berkefeld, T. - Schmidt, D. - Schmidt, W. - Denker, C. - Balthasar, H. - Hofmann, A. - Strassmeier, K.G. - Staude, J. - Feller, A. - Lagg, A. - Solanki, S.K. - Collados Vera, M. - Sigwarth, M. - Volkmer, R. - Waldmann, T.A. - Kneer, F. - Nicklas, H. - Sobotka, Michal
Active region fine structure observed at 0.08 arcsec resolution.
Astronomy & Astrophysics. Roč. 596, December (2016), A7/1-A7/8. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA MŠMT(CZ) 7E13003
Keywords : Sun * activity * sunspots
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.014, year: 2016

We characterise the appearance of light bridges and other fine-structure details and elaborate on their magneto-convective nature. We interpret our images in the context of magneto-convective simulations and findings: while central dark lanes in thin light bridges are elevated and associated with a density increase above upflows, the dark lane branches correspond to locations of downflows and are depressed relative to the adjacent bright plasma. Thick light bridges with central dark lanes show no projection effect. They have a flat elevated plateau that falls off steeply at the umbral boundary. There, Y-shaped filaments form as they do in the inner penumbra. This indicates the presence of inclined magnetic fields, meaning that the umbral magnetic field is wrapped around the convective light bridge.

Permanent Link: http://hdl.handle.net/11104/0283399