Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.144..311d&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 144, no. 1-2, May 1988, p. 311-319.
Astronomy and Astrophysics
Astrophysics
2
Chromosphere, Electric Current, Solar Corona, Solar Flares, Field Strength, Magnetic Field Configurations, Particle Energy, Solar Flux, Stellar Models
Scientific paper
The fundamental hypothesis by Alfven and Carlqvist (1967) that solar flares are related to electrical currents in the solar chromosphere and low corona is investigated in the light of modern observations. The important role of currents in solar flares is confirmed. There must be tens of such current loops ('flux threads') in any flare, and this explains the hierarchy of bursts in flares. Quantitative data on energies, numbers of particles involved, and characteristic times are summarized. A special case is the high-energy flare: this one may originate in the same way as less energetic ones, but it occurs in regions with higher magnetic field strength. Because of the high particle energies involved, their emission seats live only very briefly; hence the area of emission coincides virtually with the seat of the instability. These flares are therefore the best examples for studying the primary instability leading to the flare. Finally, the original Alfven-Carlqvist idea (that flares originate by current interruption) that flares are due to interaction (reconnection) between two or more fluxthreads. It is concluded that a final decision cannot yet be made, although the observed extremely short time constants of flare bursts seem to demand a reconnection-type instability rather than interruption of a circuit.
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