Lower hybrid heating of ionospheric ions due to ion ring distributions in cusp

Details Lower hybrid heating of ionospheric ions due to ion ring distributions in cusp Lower hybrid heating of ionospheric ions due to ion ring distributions in cusp

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4191r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4191-4203. Research supported by the U.S. Air Force a

Physics

24

Cusps, Ionospheric Heating, Magnetohydrodynamic Stability, Ring Currents, Space Plasmas, Computerized Simulation, Eigenvectors, Energetic Particles, Hydrogen Plasma, Oxygen Plasma, Poisson Equation, Power Spectra, Vlasov Equations

Scientific paper

The stability of H(+) and H(++) ring distributions which have been observed downflowing into the cusp on the DE and S3-3 satellites is examined in the context of the feedback of those instabilities on plasma of ionospheric origin consisting of (H(+) and O(+). Lower hybrid waves are excited by the ring distributions in three distinct phases of wave-particle interaction: linear growth, trapping, and quasi-linear diffusion.The latter phase accounts for most particle heating. Including background O(+) and/or a He(++) ring introduces new modes not present in a pure H(+) plasma which play an important role in heating heavier ions. O(+) is heated significantly more by a He(++) ring than a H(+) ring of comparable energy density. It is suggested that lower hybrid waves generated by downflowing ion ring distributions play a role in energizing ion conics in the cusp.

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