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Whistler mode waves in the Jovian magnetosheathDuring the Ulysses flyby of Jupiter in February 1992, the spacecraft traversed the Jovian magnetosheath for a few hours during the inbound pass and for aa few days during the outbound pass. Burstlike electomagnetic waves at frequencies of approximately 0.1-0.4 of the local electron cyclotron frequency have been observed by the Unified Radio and Plasma Wave (URAP) experiement. The waves were more often observed in the regions which were probably the outer or the middle magnetosheath, especially near the bow shock, and rarely seen in the magnetosphere/magnetosheath boundary layer. The propagation angles of the waves are estimated by comparing the measurements of the wave electric and magnetic fields in the spacecraft spin plane with the corresponding values calculated using the cold plasma dispersion relation under local field and plasma conditions. It is found that the waves propagate obliquely with wave angles between approximately 30 deg and 50 deg. These waves are likely to be the whistler mode waves which are excited by suprathermal electrons with a few hundred eV and a slight anisotropy (T(sub perp)/T(sub parallel) approximately 1.1-1.5). They are probably similar in nature to the lion roars observed in the Earth's magnetosheath. Signature of coupling between the mirror and the whistler mode have also been observed. The plasma conditions which favor the excitation of the whistler mode instability during the wave events exists as observed by the plasma experiement of Ulysses.
Document ID
19950048205
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lin, Naiguo
(Unin. of Minnesota, Minneapolis, MN Us, United States)
Kellogg, P. J.
(Unin. of Minnesota, Minneapolis, MN Us, United States)
Thiessen, J. P.
(Unin. of Minnesota, Minneapolis, MN Us, United States)
Lengyel-Frey, D.
(Univ. of Maryland, College Park, MD United States)
Tsurutani, B. T.
(Jet Propulsion Laboratory, Pasadena, CA United States)
Phillips, J. L.
(Los Alamos National Laboratory, Los Alamos, NM United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: A12
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
95A79804
Funding Number(s)
CONTRACT_GRANT: NAG5-31219
Distribution Limits
Public
Copyright
Other

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