Magnetic pulses with durations near the local proton cyclotron period - Comet Giacobini-Zinner

Details Magnetic pulses with durations near the local proton cyclotron period - Comet Giacobini-Zinner Magnetic pulses with durations near the local proton cyclotron period - Comet Giacobini-Zinner

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94...29t&link_type=abstract

(Chapman Conference on Plasma Waves and Instabilities in Magnetospheres and at Comets, Sendai, Japan, Oct. 12-16, 1987) Journal

Physics

15

Cyclotron Radiation, Electromagnetic Pulses, Giacobini-Zinner Comet, Plasma Waves, Proton Scattering, Pulse Duration, Interplanetary Medium, Polarized Electromagnetic Radiation, Solitary Waves, Time Response, Comets, Giacobini-Zinner, Magnetic Properties, Period, Ice Mission, Spacecraft Observations, Bursts, Oscillations, Amplitude, Origin, Formation, Magnetic Fields, Parameters, Waves

Scientific paper

Magnetic pulses with durations near the local proton cyclotron period (in the spacecraft frame) have been detected during the ICE encounter with Comet Giacobini-Zinner. The pulses typically last only a single cycle (solitary wave), are transverse, noncompressional oscillations, and have peak-to-peak transverse amplitudes of 2-3 nT. Occasional large pulses with amplitudes of 5-7 nT have been detected. The waves typically propagate at angles 2-15 deg relative to B(O) and are highly ellipticlly (linearly) polarized. The pulses have been detected when alpha, the angle between the ambient magnetic field and the solar wind velocity, is 90 + or - 30 deg and when ICE was 350,000-700,000 km from the comet. At the present time it is uncertain whether such pulses are generated exclusively under large alpha conditions or whether the presence of large-amplitude heavy ion cyclotron waves during more moderate alpha conditions masks their presence. It is also unclear whether these pulses are superposed on top of cometary turbulence or simply a part of it. The above observations will be compared to recent theoretical predictions of cometary waves generated during large alpha conditions.

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