Heating of proton conics by resonant absorption in a multicomponent plasma. I - Experimental evidence

Details Heating of proton conics by resonant absorption in a multicomponent plasma. I - Experimental evidence Heating of proton conics by resonant absorption in a multicomponent plasma. I - Experimental evidence

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813347r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,347-13,361.

Physics

19

Cyclotron Radiation, Extremely Low Frequencies, Hydrogen Ions, Magnetosphere-Ionosphere Coupling, Particle Acceleration, Plasma-Particle Interactions, Conics, Electron Precipitation, Energetic Particles, Protons

Scientific paper

ELF emissions observed on the low-altitude AUREOL 3 satellite are seen in association with H(+) ions at large pitch angle. The flux in the upward direction for about 20 deg pitch angle is found to be equal to or larger than the flux at about 60 deg pitch angle which provides evidence for transverse acceleration at or below the spacecraft. These emissions have a sharp lower-frequency cutoff of the transverse components of the electric field and a narrow peak at, or, more precisely, just below the proton gyrofrequency fH(+). A statistical study of the occurrence of this line at f about fH(+) is presented. It is shown that this line is observed at relatively high invariant latitude within the light ion trough where a strong depletion of thermal H(+) ions occurs. Detailed analysis of ELF waves observed just below fH(+) demonstrates that they propagate in the left-hand mode. These observations are interpreted as a signature of mode conversion from a fast magnetosonic mode into a slow proton cyclotron mode. It is suggested that this slow proton cyclotron wave can accelerate protons up to a few hundreds electron volts in the transverse direction. This mode conversion process can operate over a much broader of large altitude range than covered by AUREOL 3, it is a likely candidate for explaining the formation of H(+) conics.

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