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nature 20, 162-163 (12 June 1879) | doi:10.1038/020162a0
On the Origin of the Solar Protuberances
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WE take the following from a communication made by Herr Sporer to the Berlin Academy on November 7:- " Simultaneously with the minimum of sun-spots the protuberances have been also insignificant hitherto, but since the middle of this year (1878), while the spot minimum continues to last even far beyond expectation, important protuberances have yet appeared, and among them some from which important deductions may be drawn with tolerable certainty. " According to my observations of the year 1871 I had distinguished two classes of protuberances, viz., the ordinary hydrogen protuberances, and the flame-like protuberances which are remarkable on account of their intensity and pointed forms.
