ISSN:
0992-7689
Keywords:
Ionosphere (particle acceleration; wave-particle interactions)
;
Magnetospheric physics (magnetosphere-ionosphere interactions)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract A new phenomenon was found at the polar edge of the auroral oval in the postmidnight-morning sectors: field-aligned (FA) high-energy upward electron beams in the energy range 20–40 keV at altitudes about 3 RE, accompanied by bidirectional electron FA beams of keV energy. The beam intensity often reaches more than 0.5 · 103 electrons/s · sr · keV · cm2, and the beams are observed for a relatively long time (∼3 ∼ 102–103 s), when the satellite at the apogee moves slowly in the ILAT-MLT frame. A qualitative scenario of the acceleration mechanism is proposed, according to which the satellite is within a region of bidirectional acceleration where a stochastic FA acceleration is accomplished by waves with fluctuating FA electric field components in both directions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s00585-998-1046-1
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