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On the polarization, compression and nonoscillatory behavior of hydromagnetic waves associated with pickup ionsSolution of the kinetic dispersion equation shows that heavy pickup ions with large perpendicular energies excite a new hydromagnetic wave mode with maximum growth, high (magnetic field and mass density) compression ratios, and almost linear polarization coexisting slightly away 6-15 deg from parallel propagation. The mode arises from the coupling of the heavy ion beam to the modified left-hand wave dispersion caused by the multiion nature of the medium. The ion beam can also bring about nonoscillatory, purely growing structures distinct from the mirror wave through the coupling of a counter-streaming left-hand mode to a costreaming right-hand wave. The free energy source parameters are varied to determine their relative influence and define the domain of existence of the instability. Its characteristics may prove helpful in the interpretation of recent cometary (Halley and Giacobini-Zinner) and artificial release (AMPTE) observations.
Document ID
19870055305
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Brinca, Armando L.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tsurutani, Bruce T.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
May 1, 1987
Publication Information
Publication: Geophysical Research Letters
Volume: 14
ISSN: 0094-8276
Subject Category
Astrophysics
Accession Number
87A42579
Distribution Limits
Public
Copyright
Other

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