Unusual characteristics of electromagnetic waves excited by cometary newborn ions with large perpendicular energies

Details Unusual characteristics of electromagnetic waves excited by cometary newborn ions with large perpendicular energies Unusual characteristics of electromagnetic waves excited by cometary newborn ions with large perpendicular energies

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..311b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 187, no. 1-2, Nov. 1987, p. 311-319.

Astronomy and Astrophysics

Astrophysics

38

Astronomical Models, Cometary Atmospheres, Electromagnetic Radiation, Ion Temperature, Propagation Modes, Wave Propagation, Cyclotron Frequency, Kinetic Equations, Linear Equations, Magnetohydrodynamic Stability

Scientific paper

The characteristics of electromagnetic waves excited by cometary newborn ions with large perpendicular energies are examined using a model of solar wind permeated by dilute drifting ring distributions of electrons and oxygen ions with finite thermal spreads. The model has parameters compatible with the ICE observations at the Giacobini-Zinner comet. It is shown that cometary newborn ions with large perpendicular energies can excite a wave mode with rest frame frequencies in the order of the heavy ion cyclotron frequency, Omega(i), and unusual propagation characteristics at small obliquity angles. For parallel propagation, the mode is left-hand circularly polarized, might be unstable in a frequency range containing Omega(i), and moves in the direction of the newborn ion drift along the static magnetic field.

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