MHD waves detected by ice at distances 28 X 10 KM from Comet Halley: Cometary or solar wind origin

Details MHD waves detected by ice at distances 28 X 10 KM from Comet Halley: Cometary or solar wind origin MHD waves detected by ice at distances 28 X 10 KM from Comet Halley: Cometary or solar wind origin

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esla.sympq....t&link_type=abstract

Presented at the 20th ESLAB Symposium, Heidelberg, West Germany, 27 Oct. 1986

Physics

Cometary Atmospheres, Halley'S Comet, Ice, Magnetohydrodynamic Waves, Solar Wind, Distance, Electrostatics, Ion Cyclotron Radiation, Magnetic Fields

Scientific paper

Spectral analyses of the high resolution magnetic field data are employed to determine if there is evidence of cometary heavy ion pickup when ICE was closest to Halley, approx 28 x 10 to the 6th power km. No evidence is found for the presence of heavy ion cyclotron waves. However, from this search, two new wave modes are discovered in the solar wind: electromagnetic ion cyclotron waves and drift mirror mode waves. Both modes have scales of 10 to 60 s (1 to 6 Tp) in the spacecraft frame. The possibility of wave generation by cometary hydrogen pickup is explored. Theoretical arguments and further experimental evidence indicates that cometary origin is improbable. The most likely source is plasma instabilities associated with solar wind stream-stream interactions. VLF electrostatic emissions are found to occur in field minima or at gradients of the drift mirror structures. Possible generation mechanisms of drift mirror mode waves, cyclotron waves and electrostatic waves are discussed.

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