Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..133w&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, Feb. 1991, p. 133-142. Research supported by Swedish Board for Space Activities.
Physics
30
Atmospheric Physics, Ion Injection, Magnetohydrodynamics, Magnetosheath, Solar Terrestrial Interactions, Earth Ionosphere, Ring Currents, Satellite Observation, Solar Wind
Scientific paper
Strong, short-lived enhancements of ion fluxes at particle energies between about 100 eV and several keV are frequently observed with the hot plasma instrument on board the polar-orbiting Viking satellite (apogee at an altitude of 13,500 km) in the dayside high latitude portion of the magnetosphere. The flux enhancements are not associated with the quasi-stationary intrusion of magnetosheath plasma observed in the cusp region. A detailed analysis of one event observed on a poleward orbit near 0900 MLT is presented. The event consists of several isolated pulses, with intervals of several minutes. A characteristic energy/pitch angle dispersion pattern suggests a source for these ions near the magnetospheric boundary. From a comparison with magnetosheath ion spectra it is concluded that the source is ultimately the magnetosheath plasma.
Lundin Richard
Woch Joachim
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