Auroral Images and Particle Precipitations Observed by S-310JA-8, -9, and -10 at Syowa Station

Three sounding rockets were launched in 1984 from Syowa Station in Antarctica into different types of aurora, designated as AURORA I (an active auroral arc at the substorm expansion phase), II (a stable arc prior to the substorm onset) and III (a diffuse aurora during the recovery phase). A new tele...

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Bibliographic Details
Published inJournal of geomagnetism and geoelectricity Vol. 40; no. 7; pp. 799 - 815
Main Authors EJIRI, Masaki, ONO, Takayuki, HIRASAWA, Takeo, OGUTI, Takasi
Format Journal Article
LanguageEnglish
Published Tokyo Society of Geomagnetism and Earth, Planetary and Space Sciences 1988
Terra
Subjects
Airglow. Aurora
Earth, ocean, space
Exact sciences and technology
External geophysics
Physics of the high neutral atmosphere
Energy spectrum
Television observation
Auroral arc
Probe rocket
Electron temperature
Diffuse aurora
Auroral substorm
Particle precipitation
Electron density
Polar ionosphere
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Summary:Three sounding rockets were launched in 1984 from Syowa Station in Antarctica into different types of aurora, designated as AURORA I (an active auroral arc at the substorm expansion phase), II (a stable arc prior to the substorm onset) and III (a diffuse aurora during the recovery phase). A new television camera was used to take an auroral picture, together with the electron spectrometers to measure the energy spectrum of auroral particles. AURORA I showed greater values in both auroral emission and electron density than for AURORA II. In AURORA III, although the auroral emission intensity was much less in comparison with AURORA I, the electron density showed a pronounced enhancement in the D-region and was comparable with the case of AURORA I above the E-region. As for an energy spectrum of auroral electrons, AURORA I and II showed an inverted-V type monoenergetic peak with much higher energy for AURORA I than for AURORA II, whereas AURORA III exhibits a power-law spectrum with a small superposing monoenergetic peak around 0.5keV above 200km in altitude. The television camera showed a dependence of auroral color spectrum on the auroral activity, i. e., the ratio of an apparent emission rate at 427.8nm and an illuminance in a visible range (400 to 800nm) becomes greater for brighter aurora.
ISSN:0022-1392
2185-5765
DOI:10.5636/jgg.40.799