Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..571b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, April 1990, p. 571-574.
Physics
63
Lyman Alpha Radiation, Solar Cycles, Solar Radio Emission, Solar Spectra, Annual Variations, Solar Activity, Solar Flux, Twenty-Seven Day Variation
Scientific paper
A comparison was made of SME solar Lyman alpha flux measurements made over the period between October 11, 1981 and April 13, 1989 and ground-based measurements of the solar 10.7-cm radio flux made over the same time period. A long-term correlation was found between these two measures of solar flux during the declining part of the solar cycle, while a poor correlation was found during the solar minimum. This was because the 10.7-cm radio flux, after reaching a minimum did not vary, while the Lyman alpha flux continued to decline, showing long-term and short-term variations. During the early ascending phase of the new solar cycle, there was again a correlation. For the short-term (27-day) variation during the declining phase, there was a correlation, but the proportionality between them varied from one solar rotation to the next, indicating that the solar 10.7 radio flux is not a useful index for predicting solar Lyman alpha flux for the 27-day variation.
Barth Charles A.
Kent Tobiska W.
Rottman Gary J.
White Oran Richard
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