Physics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620105e&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 20, CiteID L20105
Physics
1
Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Auroral Phenomena (2407), Ionosphere: Particle Precipitation, Ionosphere: General Or Miscellaneous, Ionosphere: Ionization Processes (7823)
Scientific paper
Aurora occasionally exhibits short-lived appearance of a bright red border at the bottom of an auroral arc, band, or curtain. This is called a type B red aurora. Based on simultaneous measurements of auroral emissions from N2 1PG (“red” aurora) and O (1S) (“green” aurora) as well as incident electrons by the Reimei satellite, we show the following two individual observations. Energy flux and average energy of incident electrons (1) were not always higher in the red-dominated aurora than in the green-dominated aurora, and (2) were not correlated with the intensity of “green” auroras, but with the intensity of “red” auroras. These observational facts suggest that for the reddening of auroras, intense electron precipitation is unnecessary. A rapid movement, or appearance of electron precipitation is sufficient for the reddening because of the difference in lifetimes of N2 1PG and O (1S).
Asamura Kazushi
Ebihara Yasuhiro
Hirahara Masafumi
Ieda A.
Sakanoi Takeshi
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