Mirror modes and fast magnetoacoustic waves near the magnetic pileup boundary of comet P/Halley

Details Mirror modes and fast magnetoacoustic waves near the magnetic pileup boundary of comet P/Halley Mirror modes and fast magnetoacoustic waves near the magnetic pileup boundary of comet P/Halley

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9820955g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 20,955-20,964

Astronomy and Astrophysics

Astronomy

33

Electron Density (Concentration), Halley'S Comet, Interplanetary Magnetic Fields, Low Frequencies, Magnetoacoustic Waves, Spaceborne Astronomy, Wave Propagation, Giotto Mission, Magnetometers, Mirrors, Space Plasmas, Turbulence, Wave-Particle Interactions

Scientific paper

Large-amplitude ultralow-frequency wave structure observed on both sides of the magnetic pileup boundary of comet P/Halley during the flyby of the Giotto spacecraft have been analyzed using suprathermal electron density and magnetic field observations. Upstream of the boundary, electron density and magnetic field magnitude variations are anticorrelated, while in the pileup region these quantities are clearly correlated. Both in front of and behind the pileup boundary the observed waves are quasi-perpendicular wave structures as a minimum variance analysis shows. A detailed comparison of our observations in the prepileup region with theoretical and numerical results shows that the mirror mode mode waves may have been generated by a mirror instability driven by the pressure anisotropy of the ring-type distributions of the heavy (water group) pickup cometary ions.

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