Morphological and evolutional features of Ellerman bombs |
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| Authors: | H Kurokawa I Kawaguchi Y Funakoshi Y Nakai |
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| Institution: | (1) Kwasan and Hida Observatories, Kyoto University, Kamitakara, Gifu, Japan |
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| Abstract: | Morphological and evolutional features of Ellerman bombs were studied with H filtergrams of two active regions very close to the solar limb. We quantitatively determined the elongated or spike-like shape of the bomb. The mean apparent length of 174 bombs is 1.1 arc sec, while 80% of 204 bombs have a diameter of less than 0.6 arc sec. The mean lifetime of 77 bombs is about 12 min at H - 1.2 Å. The first maximum brightness of a typical bomb is attained, on average in about 2 min. Bombs grow longer in the first brightening phase and their mean upward velocity explains the blue asymmetry of H emission profiles of moustaches. |
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