About sudden disappearances and reappearances

Details About sudden disappearances and reappearances About sudden disappearances and reappearances

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.220..275b&link_type=abstract

In ESA The Hydromagnetics of the Sun p 275-276 (SEE N85-25091 14-92)

Physics

Solar Activity, Solar Activity Effects, Solar Corona, Solar Cycles, Latitude, Periodic Variations, Solar Flux

Scientific paper

Sudden Disappearances (SD) and reappearances relationships with active centers, maximum and minimum of solar cycle, latitude, coronal holes, flares, emerging flux and age of neutral lines were studied for a 50 yr period. The major fraction (68%) of SD affects filaments not in active centers. The fraction of filaments that reforms is the same (23%) in or out active centers. The number of SD rises as solar activity maximum is reached and decreases with the decay of activity. The same occurs with reappearances. The number of SD in polar filaments peaks a few years before the maximum of solar activity. The number of SD in Northern Hemisphere is greater than in the Southern. The expansion or modification of a coronal hole might trigger the SD of a nearby filament and the filament may never reappear inside the coronal hole. This suggests the transformation of a closed magnetic structure into an open one.

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