The Lyman-α Problem and the Geocoma Hypothesis

Details The Lyman-α Problem and the Geocoma Hypothesis The Lyman-α Problem and the Geocoma Hypothesis

Sep 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962natur.195..894b&link_type=abstract

Nature, Volume 195, Issue 4844, pp. 894-895 (1962).

Physics

Scientific paper

IN a recent review article, Donahue1 has discussed the various hypotheses put forward to explain the observed Lyman-α radiation2,3 in the night sky. The observed radiation is apparently solar Lyman-α radiation scattered by neutral hydrogen. There are three hypotheses concerning the location of the hydrogen: namely, the interplanetary hypothesis3; the geocorona hypothesis4,5 (origin in a thin, essentially spherical shell with multiple scattering important); and the geocoma hypothesis6,7 (origin in a comet-like distribution at distances greater than some 5-10 RE single scattering important). It is felt that the review1 is generally not unfavourable to the geocoma hypothesis, but several important points were raised by Donahue. The purpose of this communication is to discuss briefly the general status of the geocoma hypothesis in the light of recent observational and theoretical evidence and, in particular, to discuss the problems noted by Donahue.

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