Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..676s&link_type=abstract
Geophysical Research Letters, vol. 9, June 1982, p. 676-679.
Physics
11
Auroral Spectroscopy, Daytime, Earth Magnetosphere, Energetic Particles, Optical Emission Spectroscopy, Particle Interactions, Particle Precipitation, Electron States, Magnetopause, Magnetosheath, Photometry, Plasma Waves
Scientific paper
One of the characteristics of the dayside magnetospheric cusp is the precipitation of magnetosheath-like particles in this region. Spatial variations in the average energy of particles precipitating at Longyearbyen (75 deg N), Svalbard, are illutrated with the aid of ground-based daytime photometric observations of auroral optical emissions from the cusp region over Longyearbyen. The observations indicate two regions of the magnetosphere from which particles more energetic than the relatively low energy magneto-sheath electrons and protons precipitate into the dayside ionosphere. The first region of energetic particle precipitation is inside the cusp but spatially restricted near the equatorward edge of the cusp. Equatorward of the cusp, there is a region of more intense particle precipitation which gives rise to visually prominent, structured auroras.
Deehr Charles S.
Romick Gerald J.
Sivjee G. G.
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