Physics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..203h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 203-208.
Physics
10
Electric Current, Free Energy, Magnetic Field Configurations, Solar Flares, Solar Magnetic Field, Solar Physics, Sunspots, Current Density, Dynamo Theory, Stellar Models
Scientific paper
In an active region producing repeated flares the required free energy is accumulated by a strong twist of the field lines due to the rotation of a sunspot containing one end of the magnetic fluxtube. Using vector-magnetographic measurements the current flowing in the twisted field system and the free magnetic energy stored by this current are derived. This energy is sufficient to produce the observed flares. Two models are used to describe the process of energy build-up and to calculate the currents and energies. The model of a thick twisted fluxtube produces the required current and energy, provided that a continuous rotation of the sunspot existed for about 5 days; this is consistent with the observations. The application of the photospheric dynamo model of Henoux and Somov shows that this process is much more effective to generate currents of the observed strength, however the direction of the current is opposite in this model to the observation.
Hofmann Andrea
Kalman Béla
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