Upper chromospheric magnetic field of a sunspot penumbra: observations of fine structure

0488880 - ASÚ 2018 RIV FR eng J - Článek v odborném periodiku
Joshi, J. - Lagg, A. - Solanki, S.K. - Feller, A. - Collados Vera, M. - Orozco Suárez, D. - Schlichenmaier, R. - Franz, M. - Balthasar, H. - Denker, C. - Berkefeld, T. - Hofmann, A. - Kiess, C. - Nicklas, H. - Pastor Yabar, A. - Rezaei, R. - Schmidt, D. - Schmidt, W. - Sobotka, Michal - Soltau, D. - Staude, J. - Strassmeier, K.G. - Volkmer, R. - von der Lühe, O. - Waldmann, T.A.
Upper chromospheric magnetic field of a sunspot penumbra: observations of fine structure.
Astronomy & Astrophysics. Roč. 596, December (2016), A8/1-A8/8. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA MŠMT(CZ) 7E13003
Klíčová slova: Sun * activity * sunspots
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.014, rok: 2016

The fine-structure of the magnetic field in a sunspot penumbra in the upper chromosphere is to be explored and compared to that in the photosphere. We find that the inclination of the magnetic field varies in the azimuthal direction in the photosphere and in the upper chromosphere. The chromospheric variations coincide remarkably well with the variations in the inclination of the photospheric field and resemble the well-known spine and interspine structure in the photospheric layers of penumbrae. The typical peak-to-peak variations in the inclination of the magnetic field in the upper chromosphere are found to be 10 degrees-15 degrees, which is roughly half the variation in the photosphere. In contrast, the magnetic field strength of the observed penumbra does not vary on small spatial scales in the upper chromosphere.
Trvalý link: http://hdl.handle.net/11104/0283398