On the generation of magnetosheath lion roars

Journal Article · Sun Mar 01 00:00:00 EST 1987 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA092iA03p02343· OSTI ID:5399144

Lee, L C; Wu, C S; Price, C P ^[1]

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1. Univ. of Maryland, College Park (United States)

A theoretical model is proposed to discuss the electron dynamics associated with the mirror waves and their effects on the generation of the observed lion roars in the magnetosheath. It is pointed out that the usual double-adiabatic theory of hydromagnetics is not applicable to the electrons in mirror waves. Although the electron magnetic moment is conserved, the energy of each electron in the mirror waves is expected to be constant (because of the high electron speed along the magnetic field). Assuming an initial electron temperature anisotropy, the authors can show that in the low field region the electron temperature and thermal anisotropy are higher than the initial values, whereas in the high field region the electron temperature and anisotropy are lower. This point can lead to a theoretical explanation of the important features of the observed lion roars. The present discussion complements the existing theories in the literature.

• DOE Contract Number: FG06-86ER13530
• OSTI ID: 5399144
• Journal Information: Journal of Geophysical Research; (United States), Vol. 92:A3; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MAGNETOSHEATH
ELECTROMAGNETIC RADIATION
ADIABATIC PROCESSES
ANISOTROPY
ELECTRON TEMPERATURE
ELECTRONS
MAGNETIC MOMENTS
MATHEMATICAL MODELS
POLARIZATION
SATELLITES
WAVE PROPAGATION
WHISTLERS
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
NOISE
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)