Physics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4765p&link_type=abstract
Journal of Geophysical Research, vol. 82, Oct. 1, 1977, p. 4765-4776.
Physics
4
Electron Precipitation, Energy Spectra, Proton Precipitation, Satellite Observation, Cusps, Electron Energy, Electron Flux Density, Explorer Satellites, Field Aligned Currents, Interplanetary Magnetic Fields, Proton Energy, Proton Flux Density
Scientific paper
AE-C and AE-D observations at low altitudes in the high-latitude region near magnetic local noon have revealed properties of low energy electrons and protons that are similar to those determined from earlier particle and field-aligned current observations. The principal feature determined in the present study is a well-defined boundary (less than a few km or 0.01 deg in invariant latitude) which appears only in the postnoon high-latitude region. Energy spectra of low energy electrons and protons show a distinctive softening at latitudes above this boundary. The region of soft particle precipitation above this boundary (located near 78 deg invariant latitude during moderately disturbed to quiet geomagnetic conditions) is identified as the dayside cusp.
Bostrom C. O.
Doering John P.
Hoffman Robert A.
McEntire Richard W.
Peterson William K.
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