He/++/ and H/+/ flux measurements in the day side cusp - Estimates of convection electric field

Physics

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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.

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