The flares of spotless regions

Physics

Scientific paper

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Magnetic Field Configurations, Solar Atmosphere, Solar Flares, Solar Magnetic Field, Energy Storage, Fibrillation, Filaments, Solar Physics

Scientific paper

The 20 flares of sunspotless regions observed at Yunnan Observatory in cycle 21 are analyzed. It is found that the natural productivity of spotless flares is about three percent, that the distribution of the Carrington longitudes tends to shift eastwards, that most of the spotless region flares are those at low energy, and that the background conditions of producing spotless region flares are the same as those of producing spot region flares. Thus, there must be a magnetic field structure with opposite polarity in the solar atmosphere of a flare region. The change in inclination of a filament to a fibril in a spotless region from a large angle to a small one indicates that the force exerted on the spotless active region transforms gradually from pressure to shearing force, meaning that the activity changes gradually from energy storage to sudden energy release.

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