Proton beam generation of oblique whistler waves

Journal Article · Sun May 01 04:00:00 EDT 1988 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA093iA05p04110· OSTI ID:5962305

Wong, H K ^[1]; Goldstein, M L ^[2]

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1. Southwest Research Inst., San Antonio, TX (United States)
2. NASA Goddard Space Flight Center, Greenbelt, MD (United States)

It is known that ion beams are capable of generating whistler waves that propagate parallel to the mean magnetic field {und B}{sub o}. Such waves may have been observed both upstream of the Earth's bow shock and in the vicinity of comets. The authors extend previous analyses to include propagation oblique to {und B}{sub 0}. The instability is generated by the perpendicular component of free energy in the ions; which can arise either via a temperature anisotropy (T{sub perpendicular}/T{sub parallel} {much gt} 1) or via a gyrating distribution. In the former case the generation of whistler waves is confined to a fairly narrow cone of propagation directions centered about parallel propagation; while in the latter case, the maximum growth of the instability can occur at fairly large obliquities ({theta} {congruent} 50{degree}).

• OSTI ID: 5962305
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 93:A5; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
BEAMS
COMETS
DATA ANALYSIS
DISTRIBUTION
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ELECTROMAGNETIC RADIATION
INSTABILITY
INTERACTIONS
NOISE
NUCLEON BEAMS
PARTICLE BEAMS
PLASMA INSTABILITY
PROTON BEAMS
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
SHOCK WAVES
SOLAR ACTIVITY
SOLAR WIND
SPATIAL DISTRIBUTION
WAVE PROPAGATION
WHISTLERS