Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.295...41h&link_type=abstract
Nature, vol. 295, Jan. 7, 1982, p. 41, 42.
Astronomy and Astrophysics
Astrophysics
47
Bow Waves, Collisionless Plasmas, Earth Atmosphere, Magnetohydrodynamic Waves, Particle Acceleration, Planetary Atmospheres, Shock Waves, Cosmic Rays, Interplanetary Magnetic Fields, Ion Beams, Ionization Frequencies
Scientific paper
One property of the collisionless shocks that may be studied through a comparison of their behavior in a variety of plasma conditions at several different planets is the occurrence of MHD waves, associated with particle beams accelerated at these shocks and flowing backward to the sun. Mercury, Venus, earth and Jupiter observations of one of these wave classes show that (1) the empirical relationship between interplanetary field strength and wave frequency in the observer's rest frame is approximately true at all the planets considered, and (2) the observed frequencies are consistent with resonance with beams of ions of the same energy at each of the planets. This is, in turn, in keeping with the Sonnerup (1969) geometrical model of ion reflection at collisionless shocks. It is suggested that this ion acceleration mechanism may occur in astrophysical systems similar to the solar system, providing a source of acceleration for cosmic rays.
Hoppe Michael
Russell Christopher T.
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