Drift boundaries and ULF wave generation near noon at geostationary orbit

Details Drift boundaries and ULF wave generation near noon at geostationary orbit Drift boundaries and ULF wave generation near noon at geostationary orbit

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..639k&link_type=abstract

(Chapman Conference on Waves in Magnetospheric Plasmas, Kona, HI, Feb. 1983) Geophysical Research Letters (ISSN 0094-8276), vol.

Physics

11

Extremely Low Radio Frequencies, Geosynchronous Orbits, Magnetospheric Ion Density, Spatial Distribution, Wave Propagation, Diurnal Variations, Flux (Rate), Geos 2 Satellite, Noon, Plasma Pressure

Scientific paper

Sharp increases in particle flux near 1400 LT without appreciable energy dispersion for ions at 90 deg pitch angle are noted in GEOS 2 coordinated observations of 20-400 keV energetic particles, 300 eV-20 keV plasma particles, dc electric fields, and 0.2-10 Hz ULF waves. Intensity increases of ions with angles away from 90 deg preceded those at 90 deg and exhibited an energy dispersion consistent with the suggestion that these particles are injected in the midnight sector and drift toward noon. The boundaries established by the global electric field, which particles of given adiabatic invariants cannot penetrate, seem to be associated with intense ULF waves observed close to the proton gyrofrequency and its harmonics. The waves may be compressional drift waves destabilized by plasma pressure gradients.

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