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Morphological and evolutional features of Ellerman bombs

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Abstract

Morphological and evolutional features of Ellerman bombs were studied with Hα 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 Hα - 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 Hα emission profiles of moustaches.

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Authors and Affiliations

  1. Kwasan and Hida Observatories, Kyoto University, Kamitakara, Gifu, Japan

    H. Kurokawa, I. Kawaguchi, Y. Funakoshi & Y. Nakai

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  1. H. Kurokawa
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  2. I. Kawaguchi
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  3. Y. Funakoshi
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  4. Y. Nakai
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Kurokawa, H., Kawaguchi, I., Funakoshi, Y. et al. Morphological and evolutional features of Ellerman bombs. Sol Phys 79, 77–84 (1982). https://doi.org/10.1007/BF00146974

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  • DOI: https://doi.org/10.1007/BF00146974

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