Amplification of hydromagnetic waves in the magnetosphere by a cyclotron instability process with applications to the theory of hydromagnetic whistlers

Details Amplification of hydromagnetic waves in the magnetosphere by a cyclotron instability process with applications to the theory of hydromagnetic whistlers Amplification of hydromagnetic waves in the magnetosphere by a cyclotron instability process with applications to the theory of hydromagnetic whistlers

Feb 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966jatp...28..235j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 28, no. 2, pp. 235-248, IN3, 249-253

Physics

5

Scientific paper

Cyclotron instabilities in hydromagnetic (abbreviated hm hereafter) waves in the magnetosphere are investigated as a possible origin of geomagnetic micropulsations. Emphasis is placed on instabilities related to the ion resonance mode of waves, which are relevant to hm whistlers. They may be caused by both an electron and a proton stream. The instability set up by an electron stream is convective which is synonymous with a travelling amplifying wave. The instability set up by a proton stream, however, is nonconvective, i.e. it behaves as a self-exciting oscillator. Despite the difference in the instability mechanisms, a hm signal in the magnetosphere generated by either process gives an observable effect on the Earth's surface. A proton stream with a velocity of the order of 108 cm/sec is able to cause an instability with frequencies comparable to those of hm whistlers, several fractions of 1 c/s to several c/s, at a distance of several Earth radii. It is not unreasonable to expect a sufficiently high growth rate, say, 10-1 per secE Electrons, however, must be relativistic to cause an instability at a comparable frequency. Protons, therefore, seem to be more favoured as the origin of hm whistlers.

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