Morphological and evolutional features of Ellerman bombs

✍ Scribed by H. Kurokawa; I. Kawaguchi; Y. Funakoshi; Y. Nakai

• Publisher: Springer
• Year: 1982
• Tongue: English
• Weight: 798 KB
• Volume: 79
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00146974

✦ Synopsis

Morphological and evolutional features of Ellerman bombs were studied with He 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 Hc~ -1.2 A. 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 He emission profiles of moustaches.