Geomagnetically trapped alpha particles from 18 to 70 MeV

Details Geomagnetically trapped alpha particles from 18 to 70 MeV Geomagnetically trapped alpha particles from 18 to 70 MeV

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1938r&link_type=abstract

Journal of Geophysical Research, vol. 82, May 1, 1977, p. 1938-1942.

Physics

3

Alpha Particles, Energy Spectra, Inner Radiation Belt, Magnetically Trapped Particles, Particle Energy, Angular Distribution, Geomagnetism, Radial Distribution, Solar Wind

Scientific paper

The energy spectrum of alpha particles trapped in the magnetosphere has been measured between 18 and 70 MeV for L values from 1.85 to 2.85 at 740-km altitude. In this energy range the spectrum is described by a power law with exponent 5.5 + or - 1.3. The L distributions of alphas and protons with the same energy per nucleon are similar, but at the same energy per particle, distributions are distinctly different. The alpha-to-proton ratio maximum is 0.0035, an order of magnitude lower than that in the solar wind, and it falls steeply with energy.

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