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Note on the electron energy spectrum in the inner Van Allen Belt

1962; American Geophysical Union; Volume: 67; Issue: 9 Linguagem: Inglês

10.1029/jz067i009p03281

2156-2202

G. Pizzella, C. Laughlin, B. J. O’Brien,

Planetary Science and Exploration

Journal of Geophysical Research (1896-1977)Volume 67, Issue 9 p. 3281-3287 Note on the electron energy spectrum in the inner Van Allen Belt G. Pizzella, G. PizzellaSearch for more papers by this authorC. D. Laughlin, C. D. LaughlinSearch for more papers by this authorB. J. O'Brien, B. J. O'BrienSearch for more papers by this author G. Pizzella, G. PizzellaSearch for more papers by this authorC. D. Laughlin, C. D. LaughlinSearch for more papers by this authorB. J. O'Brien, B. J. O'BrienSearch for more papers by this author First published: August 1962 https://doi.org/10.1029/JZ067i009p03281Citations: 24AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The energy spectrum of trapped electrons predicted by the neutron-albedo theory was tested experimentally with a magnetic electron spectrometer for the energy range 40≤E≤110 kev. This detector was flown on the State University of Iowa radiation research satellite Injun I at an altitude of about 1000 km in the inner radiation zone over South America. Another detector on the same satellite measured the directional intensity of electrons with E≥40 kev. The data are consistent with a peak directional intensity of electrons in this region of N(E)∼104 exp ( −E/160) particles (cm2 sec ster kev)−1, or with a power-law spectrum with a differential exponent of −(1.0±0.2) for 40≤E≤110 kev. This result is significantly in disagreement with the predictions of the neutron-albedo theory. References Frank, L. A., D. C. Dennison, J. A. Van Allen, Electrons in the earth's inner radiation zone, abstract, J. Geophys. Research, 67, 3558, 1962. Freeman, J. W., Detection of an intense flux of low-energy protons or ions trapped in the inner radiation zone, J. Geophys. Research, 67, 921–929, 1962. Holly, F. E., L. Allen Jr., R. G. Johnson, Radiation measurements to 1500 kilometer altitude at equatorial latitudes, J. Geophys. Research, 66, 1627–1639, 1961. Lenchek, A. M., S. F. Singer, R. C. Wentworth, Geomagnetically trapped electrons from cosmic ray albedo neutrons, J. Geophys. Research, 66, 4027–4047, 1961. Mcllwain, C. E., Evidence of high fluxes of electrons in the inner zone, abstract, J. Geophys. Research, 67, 1647, 1962. McIlwain, C. E., Coordinates for mapping the distribution of magnetically trapped particles, J. Geophys. Research, 66, 3681–3691, 1961. O'Brien, B. J., C. D. Laughlin, J. A. Van Allen, L. Frank, Measurements of the intensity and spectrum of electrons at 1000 km altitude and high latitudes, J. Geophys. Research, 67, 1209–1226, 1962. Pizzella, G., C. E. McIlwain, J. A. Van Allen, Time variation of intensity in the earth's inner radiation zone, October 1959 through December 1960, J. Geophys. Research, 67, 1235–1254, 1962. Van Allen, J. A., C. E. McIlwain, G. H. Ludwig, Radiation observations with satellite 1958ϵ, J. Geophys. Research, 64, 271–286, 1959. Weber, A. H., C. A. Lundquist, R. J. Naumann, Directional flux densities and mirror-point distribution of geomagnetically trapped charged particles from satellite 1958ϵ measurements, abstract, J. Geophys. Research, 67, 1662, 1962. Citing Literature Volume67, Issue9August 1962Pages 3281-3287 ReferencesRelatedInformation