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physical phenomena > event > atomic process > collision > scattering > backscatter > gegenschein
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gegenschein
(counterglow)
subjectfact 
gegenscheinhas synonym counterglow2001-09-27 09:29:50.0
has definition Faint oval patch of light visible from Earth only at certain times of the year, opposite the Sun. Its nature and cause are still not known. It is sometimes known as "counterglow".has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:29:50.0
has definition A very faint glow (about 10° across) which can occasionally be seen in a part of the sky opposite the Sun.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:29:50.0
has definition Faint nebulous light about 20° across near the ecliptic and opposite the Sun, best seen in September and October. Also called counterglow.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:29:50.0
is a kind of backscatter2001-09-27 09:29:50.0
radiation direction modificationchanges property direction2001-09-27 09:29:45.0
atomic processhas domain atomic physics2001-09-27 09:29:47.0
eventhas duration2001-09-27 09:29:57.0
has time of occurrence2001-09-27 09:29:57.0