Physics
Scientific paper
Dec 1936
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1936natur.138.1017n&link_type=abstract
Nature, Volume 138, Issue 3502, pp. 1017 (1936).
Physics
Scientific paper
WITH reference to the three recent large sunspots reported in NATURE of December 5, p. 965, it is of interest to note that on December 3 a bright hydrogen eruption was observed at the Royal Observatory, Greenwich, to take place near one of them which was at the time 55° west of the sun's central meridian. The region in question was under observation with the spectrohelioscope (using the hydrogen line of the solar spectrum, Hα) at 11h 46m U.T., when a minor bright eruption was seen to be in progress. At 11h 57m a recrudescence of activity began, and by 12h 03m the bright hydrogen eruption had become as bright as the continuous spectrum 4A. from the centre of the Hα line. At 12h 18m, cloud unfortunately intervened, but from previous experience it is known that the average duration of the major bright eruptions is 30-45 minutes.
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