Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.2563v&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A2, p. 2563-2572
Physics
3
Ionosphere: Auroral Ionosphere, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Particle Acceleration, Ionosphere: Wave/Particle Interactions
Scientific paper
We present a study of strong ELF waves correlated with O+ ion heating. We investigate the kinetic energy flux of oxygen ions and electrons parallel to the ambient magnetic field and the Poynting flux along the magnetic field of waves in different frequency regions. We show that the Poynting flux of lower hybrid waves and waves with frequencies below the oxygen gyrofrequency is downward but much less than the upgoing oxygen ion energy flux. The Poynting flux of ELF waves with frequencies at about half the local proton gyrofrequency is also downward, and it is comparable to, or larger, than the upward oxygen energy flux. Our results are consistent with a scenario where ELF waves with frequencies around half the proton gyrofrequency are generated above the satellite and transfer energy to oxygen ions in a region below the satellite.
André Mats
Blomberg Lars
Clemmons James Hart
Norqvist Patrik
Oscarsson Tord
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