Relativistic electron microbursts

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/92JA01138· OSTI ID:6967508

Imhof, W L; Voss, H D; Mobilia, J; Datlowe, D W; Gaines, E E; McGlennon, J P ^[1]; Inan, U S ^[2]

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1. Lockheed Palo Alto Research Lab., CA (United States)
2. Stanford Univ., CA (United States)

The authors report the first satellite observations of relativistic ([gt]1 MeV) electron precipitation in microbursts with measured durations of less than 1 s. Microburst of lower-energy electrons (10-100 keV) have been found to occur preferentially in the early daylight hours and to be closely associated with VLF chorus emissions. In contrast, the relativistic electron microbursts occurred more frequently near 2230 LT than 1030 LT, and no association was found with ELF/VLF chorus, consistent with the fact that resonant interactions with [approximately]1-MeV electrons require significantly lower frequencies. The available data on these relativistic microbursts thus appear to indicate that many of the bursts may be due to wave-particle interaction not with whistler mode chorus but possibly with other waveforms. The locations of many of the relativistic microbursts are concentrated at the outer edge of the trapped radiation belt, where the gyroradii of the electrons are comparable to the curvature of the magnetic field lines and stable trapping may therefore not occur. The preferred location of the microbursts, which may be primarily spatial in character, implies the possible importance of irregularities in the magnetic field lines near the trapping boundary as the responsible mechanism.

• OSTI ID: 6967508
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 97:A9; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED-PARTICLE PRECIPITATION
COORDINATES
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELECTRON PRECIPITATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
INTERACTIONS
LEPTONS
NOISE
RADIATION BELTS
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
RELATIVISTIC RANGE
SATELLITES
TRAPPED ELECTRONS