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Astron. Astrophys. Suppl. Ser.
Volume 119, Number 2, October_II 1996
Page(s) 205 - 210
Published online 15 October 1996
Magnetic configuration of a sunspot region DOI: 10.1051/aas:1996238

Astronomy and Astrophysics Supplement Series, Vol. 119, October II 1996, 205-210

Magnetic configuration of a sunspot region using the H line

Hongqi Zhang

Beijing Astronomical Observatory, Chinese Academy of Sciences Beijing 100080, China

Received June 6, 1995; accepted February 12, 1996


The configuration of the magnetic field in an active region is analysed using a set of H chromospheric magnetograms and narrow pass-band filtergrams taken at various positions on the line. We found that the chromospheric magnetic field is parallel to the chromospheric features and inhomogeneous. The photospheric magnetic field disappears abruptly in the edge of the penumbra; the chromospheric field extends beyond the penumbral boundary with an inclination of about to the solar surface. Chromospheric superpenumbral filaments show a good correlation with the chromospheric magnetic field and their configurations are related to the photospheric magnetic structures nearby the sunspot. Part of the magnetic flux of the sunspot returns to the neighbouring enhanced networks, which is almost vertical to the solar surface.

Key words: Sun: magnetic fields; chromosphere; sunspots

Copyright EDP Sciences

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