Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2363s&link_type=abstract
Journal of Geophysical Research, vol. 81, May 1, 1976, p. 2363-2370. Research supported by the U.S. Defense Nuclear Agency, U.S
Physics
23
Earth Magnetosphere, Electric Fields, Helium Ions, Hydrogen Ions, Polar Regions, Satellite Observation, Trapped Particles, Convection, Electron Precipitation, Energy Spectra, Kp Index, Lines Of Force, Mass Spectrometers, Particle Flux Density, Solar Wind
Scientific paper
Ion mass spectrometer measurements of He(++) and H(+) ion spectra on a satellite pass through the low-altitude (800 km) dayside cusp during the magnetically active (Kp = 60) period of March 7, 1972, are reported. These measurements in the energy-per-unit-charge range between 0.7 and 12 keV show a systematic velocity dependence in the latitudinal distributions. This dependence is explained by a dawn-dusk convection electric field of 30-60 mV/m operating in the cusp. The average velocity spectrum of He(++) is found to be significantly harder than the accompanying H(+) spectrum, suggesting the possibility of an electrostatic deceleration mechanism operating between the solar-wind source region and the low-altitude cusp.
Johnson Richard G.
Sharp R. D.
Shelley Edward G.
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