Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1918
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1918natur.100..425l&link_type=abstract
Nature, Volume 100, Issue 2518, pp. 425 (1918).
Astronomy and Astrophysics
Astronomy
Scientific paper
IT has attracted the attention of astronomers for some time that solar prominences appear to be more numerous on the east, or advancing, side of the sun than on the west, or receding, side, and systematic observations have been instituted to test this unexpected result. The current Kodaikanal Bulletin (lvii., August, 1917) seems to establish it definitely by a very complete analysis of the observations for the first half of 1917. Of prominences projected on the solar disc as absorption markings, 52.9 per cent, as regards area, and 53.4 per cent. as regards number, were on the eastern side of the central meridian. Of reversals and displacements (largely preponderant towards the red) of hydrogen lines on the disc, there was a like excess on the eastern side. But of the bright prominences directly observed on the limb there was no excess as regards number, and only a slight excess as regards area.
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