On the asymmetry of the sudden disappearances of solar filaments

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Scientific paper

In this paper we analyze the sudden disappearances of filaments and prominences, which are of great interest in the study of solar terestrial relationships. Sudden disappearance of filaments were identified from the H-alpha images taken at Prairie View Solar Observatory and from Meudon Observatory spectroheliograms, for the period January 1, 2000 to June 30, 2001. The distribution of the disappearances show an asymmetry between the northern hemisphere and the southern hemisphere. On average, a grater number of disappearances were recorded in the northern hemisphere, although the number of filaments was seemingly equal in the two hemispheres. The evoution of the asymmetry during this period is related with the asymmetry of other indices of solar activity. The relationship between the sudden disappearances and other solar phenomena, like the Coronal Mass Ejections, is also considered.

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