Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 199
r its size, being about 100,000 miles long andhalf as broad. At 12:30 p. m. he was called away,having noticed nothing special, except that below oneend of the prominence a small bright lump had de-veloped on the solar surface. In twenty-five minuteshe returned, but the prominence was gone. The… … Two classes ofprominences. Fig. 96.—A Quiescent Prominence. times as swiftly as a rifle bullet flies. In ten minutes ithad reached a height of 200,000 miles. At 1:15 p. m.only a few shreds of the prominence were visible. Prominences are divided into two classes, the quiescentand the eruptive. The…
Astronomy
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