Heating of O(+) ions in the cusp/cleft - Double-cyclotron absorption versus cyclotron resonance

Details Heating of O(+) ions in the cusp/cleft - Double-cyclotron absorption versus cyclotron resonance Heating of O(+) ions in the cusp/cleft - Double-cyclotron absorption versus cyclotron resonance

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1429b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1429-1437. Research supported by NFR.

Physics

9

Cyclotron Resonance, Ionospheric Heating, Oxygen Ions, Polar Cusps, Wave Attenuation, Earth Ionosphere, Earth Magnetosphere, Gyrofrequency, Ion Temperature

Scientific paper

The low-energy oxygen O(+) distributions and the electric spectral densities obseraved by DE 1 in the cusp/cleft during an O(+) conic event are used as inputs to a Monte Carlo simulation of the heating of the O(+) ions due to double-cyclotron absorption of waves near half the ion gyrofrequency. The results are compared with the observed O(+) conics and with the results of simulations of ion heating via the process of cyclotron resonance involving left-hand polarized waves near the ion gyrofrequency. The simulations show that for any particular event cyclotron resonance can probably heat ions over a much greater altitude range than double-cyclotron absorption is capable of doing. They also demonstrate the much stronger dependence of the heating due to double-cyclotron absorption on local intensifications of the spectral density, and they indicate that a relatively narrow region of intense wave activity may be sufficient for this heating process to produce O(+) conics with energies comparable to those observed.

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