Morning sector ion precipitation following substorm injections

Details Morning sector ion precipitation following substorm injections Morning sector ion precipitation following substorm injections

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3430s&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3430-3438.

Physics

25

Auroral Spectroscopy, Auroral Zones, Diurnal Variations, Earth Magnetosphere, Ion Injection, Magnetic Storms, Particle Precipitation, Balmer Series, Earth Ionosphere, Geomagnetism, Ion Motion, Particle Acceleration, Plasma Layers, Proton Precipitation, Satellite Observation, Spectral Energy Distribution

Scientific paper

Auroral ion measurements (0.4-30 keV) made from Aureol 1 have revealed two types of precipitation with different energy characteristics in the auroral and subauroral nighttime zone: (1) in the entire nighttime auroral zone, a proton precipitation with an average energy ranging from 5 to at least 25 keV, which coincides with the region of auroral Balmer series line emission as observed from the ground; and (2) a subauroral precipitation of ions with energy less than 12 to 15 keV limited to the morning sector between approximately 0000 and 0500-0600 MLT. This newly observed structure is sporadic and takes place in the hours following the injections of plasma sheet particles into the inner magnetosphere at the onset of magnetospheric substorms. The ionospheric region affected by this precipitation corresponds, in the equatorial plane, to the zone in which Alfven layers result from the ion drift pattern.

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