Other
Scientific paper
Jun 1908
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1908natur..78..151b&link_type=abstract
Nature, Volume 78, Issue 2016, pp. 151 (1908).
Other
Scientific paper
PRESSURE of work in other directions prevented me from writing these lines before to-day. They have reference to an article contained in NATURE for April 2, in which Dr. Lockyer describes what he considers a triple concentric arc formation in the upper chromosphere similar to coronal structures observed during the eclipses of 1898, 1901, and 1905. Through the kindness of Prof. Hale, the British Astronomical Association is in possession of a photographic slide showing a composite calcium spectroheliogram taken of the sun's disc and chromosphere on July 17, 1907 i.e. the same date as the South Kensington one. Prof. Hale took the picture at 6.46 a.m. P.S.T., while Dr. Lockyer took his at South Kensington at 3.14 p.m. G.M.T. There is thus a difference of something like half an hour between the two exposures, that at Mount Wilson being the earlier one. Comparing the two spectroheliograms, it becomes evident that what Dr. Lockyer considers concentric coronal arcs, due to eruptive action either immediately in front or in the rear of the formation, constitute in reality the débris of an eruptive prominence. I happened to be observing the sun at the time, starting about 1.30 p.m. L.T., having also had the sun under observation early in the morning, and an extract of my notes reads thus:-
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