Transversely accelerated ions - An ionospheric source of hot magnetospheric ions

Details Transversely accelerated ions - An ionospheric source of hot magnetospheric ions Transversely accelerated ions - An ionospheric source of hot magnetospheric ions

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4229k&link_type=abstract

Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4229-4237.

Physics

25

Auroral Zones, Earth Ionosphere, Earth Magnetosphere, Particle Acceleration, Night, Summer, Winter

Scientific paper

The paper considers observational data on transversely accelerated ion (TAI) events observed from the Isis 1 and 2 satellites. A source of hot magnetospheric ions was discovered in the auroral topside ionosphere, and a part of the cold ionospheric ion distribution is transversely accelerated within a source region as low as 1000 km. Subsequent to transverse acceleration, the ions are driven upward into the magnetosphere by the gradient B mirror force; they are observed by the soft particle spectrometers on the Isis 1 and 2 satellites, with sharply defined pitch angle distributions centered between 90 and 120 deg, and with energy distributions up to several hundred electron volts. Observations at 1400 km indicate that the transversely accelerated ion (TAI) events are predominantly a winter nightside auroral zone phenomenon, but in the summertime TAI events were observed at altitudes above 2750 km on the day-side within the cleft. Typical intensities exceeding 10 to the 8th power ions/sq cm s sr during TAI events suggest that they may be a significant source of hot ions for the magnetosphere.

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