Abstract
One hundred seventy-eight Ellerman bombs were identified and studied with on- and off-band Hα filtergrams of two active centers, one near disk center and the other near the east limb. The photographs, taken through a 1/4 A bandpass filter, occasionally attained resolution as fine as 0.3″. The mean duration of bombs at Hα-2 A was about 13 min near disk center and 11 min near the limb; these times increase slightly when we observe closer to the core of Hα. Eighty-six percent of the bombs in the near-limb region and 56% in the disk-center region were seen to be accompanied by ejections of dark material; the ejections were 3–30″ long. The ejection length appears to be proportional to the bomb size times the bomb lifetime.
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