MHD waves detected by ICE at distances greater than or = 28 million KM from Comet Halley: Cometary or solar wind origin?

Details MHD waves detected by ICE at distances greater than or = 28 million KM from Comet Halley: Cometary or solar wind origin? MHD waves detected by ICE at distances greater than or = 28 million KM from Comet Halley: Cometary or solar wind origin?

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.451t&link_type=abstract

In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 451-456 (SEE N87-26714

Physics

Cometary Atmospheres, Halley'S Comet, Magnetohydrodynamic Waves, Solar Wind, Wave Generation, Heavy Ions, International Sun Earth Explorer 3, Ion Cyclotron Radiation, Magnetic Fields, Magnetic Mirrors, Plasma Drift, Spectrum Analysis

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, ≡28×106km. 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 - 60 s (1 - 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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