Cleft signature in proton fluxes above 100 keV

Details Cleft signature in proton fluxes above 100 keV Cleft signature in proton fluxes above 100 keV

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80..685a&link_type=abstract

Journal of Geophysical Research, vol. 80, Feb. 1, 1975, p. 685-689. Research supported by the Norges Teknisk-Naturvitenskapelig

Physics

Earth Magnetosphere, Energy Spectra, Polar Regions, Proton Flux Density, Proton Precipitation, Angular Distribution, Auroras, Geomagnetism, Periodic Variations, Pitch (Inclination), Proton Energy, Satellite Observation

Scientific paper

Experimental evidence is presented that the low-energy proton population, which is the signature of the polar cleft region, has a high-energy tail of above 100-keV proton fluxes. The precipitation zone of these higher-energy protons covers the same latitude band as the low-energy particles do and also experiences the same latitudinal displacements during changes in the geomagnetic conditions. The precipitation has an isotropic pitch angle distribution and the measured higher-energy intensities compare favorably with values extrapolated from the spectrum at lower energies. The statistical invariant latitude pattern described by above 100-keV precipitating protons in the magnetic local time span 0006-1800 hours is presented.

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