Other
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.335..417h&link_type=abstract
Nature (ISSN 0028-0836), vol. 335, Sept. 29, 1988, p. 417-419. NASA-supported research.
Other
9
Comets, Lyman Alpha Radiation, Solar System, Voyager 2 Spacecraft, Cometary Atmospheres, Hydrogen Atoms, Interstellar Matter
Scientific paper
Ultraviolet measurements made by Voyager 2, apparently showing a rapid decrease in hydrogen Lyman-alpha emission with distance from the sun, were taken by Donahue et al. (1987) as evidence for a source of atomic hydrogen in the very local interstellar medium (VLISM). The suggested source of the hydrogen is a class of small comets at solar distances of about 1 AU. This claim has been adduced as evidence for a theory that the earth is subject to a large influx of cometary material significantly affecting atmospheric evolution. The Voyager 2 data have been reanalyzed, and it is shown that no source of hydrogen in the VLISM is required other than the inflow of neutral atoms.
Hall Doyle T.
Shemansky Don E.
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