SID flares and sunspot morphology

Details SID flares and sunspot morphology SID flares and sunspot morphology

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...88..137a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 88, Oct. 1983, p. 137-153.

Physics

5

Solar Activity Effects, Solar Flares, Solar Terrestrial Interactions, Sudden Ionospheric Disturbances, Sunspots, D Region, Force-Free Magnetic Fields, Magnetic Field Configurations, Morphology, Solar Magnetic Field

Scientific paper

The degree of association between geoeffective (SID producing) flares (hereafter called SID flares) and sunspot morphology is examined. It is found that: (1) the frequency of SID flares associated with sunspot groups is linear function of sunspot area and rate of change in area; (2) the SID flare intensity is dependent on the sunspot area and on the magnetic morphology (field geometry); (3) the probability of a sunspot group being magnetically complex (henceforth called complex ratio) is a linear function of spot area, the larger this area the more likely a group is in the beta-gamma or delta magnetic class; (4) the complex ratio exhibits the greatest degree of association to SID flare frequency. It is concluded from these results that a higher frequency of D-region ionizing flares is likely to accompany the disk transit of large area, complex spot groups. This combination of morphological factors reflects a shearing of the associated force-free magnetic field, with accumulation of free magnetic energy to power SID flares. Mutual polarity intrusion would be one observational signature of the pre-flare energy storing process.

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