Magnetic field topology of an active region

Details Magnetic field topology of an active region Magnetic field topology of an active region

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990an....311..309l&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 311, no. 5, 1990, p. 309-311.

Astronomy and Astrophysics

Astronomy

2

H Alpha Line, Solar Activity, Solar Flares, Solar Magnetic Field, Topology, Field Aligned Currents, Photosphere, Solar Atmosphere

Scientific paper

The global three-dimensional topology of the magnetic field of the weakly flaring active region AR 5420 in the early phase has been estimated using a series of photospheric longitudinal and vector magnetograms together with H-alpha filtergrams and white-light images. A force-free magnetic-field character is assumed. An arcadelike structure of the magnetic field has been identified in the preflare phase, with an apparent sheared configuration already present in the current-free field case. This system might have been an important source of generation of a field-aligned current system for the eruptions that followed.

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