Steepened magnetosonic waves in the high beta plasma surrounding Comet Giacobini-Zinner

Details Steepened magnetosonic waves in the high beta plasma surrounding Comet Giacobini-Zinner Steepened magnetosonic waves in the high beta plasma surrounding Comet Giacobini-Zinner

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.457t&link_type=abstract

In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 457-460 (SEE N87-26714

Computer Science

Beta Factor, Electron Density Profiles, Giacobini-Zinner Comet, Plasma Waves, Wave Propagation, International Sun Earth Explorer 3, Magnetic Fields, Magnetohydrodynamic Stability, Plasma Turbulence, Propagation Modes, Solar Wind

Scientific paper

Studies of intense hydromagnetic waves at Giacobini-Zinner are extended to investigate the mode and direction of wave propagation. Simultaneous high-resolution measurements of electron density fluctuations demonstrate that long period waves propagate in the magnetosonic mode. Principal axis analyses of the long period waves and accompanying partial rotations show that the sum of the wave phase rotations is 360 deg, indicating that both are parts of the same wave oscillation. The time sequence of the steepened waveforms observed by ICE shows that the waves must propagate towards the Sun with Cph less than Vsw. Observations are consistent with wave generation by resonant ion ring or ion beam instability which predicts right-hand polarized waves propagating in the ion beam (solar) direction. The large amplitudes and small scale sizes of the cometary waves suggest that rapid pitch-angle scattering and energy transfer with energetic ions should occur. Since the waves are highly compressive, first-order Fermi acceleration is forecast.

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