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Low-Energy Electrons in the Magnetosphere as Observed by OGO-1 and OGO-3

  • Vytenis M. Vasyliunas
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 10)

Abstract

Although the first observation of low energy (a few hundred eV to a few keV) electrons in the magnetosphere dates back to the early days of space exploration (Gringauz et al., 1960), detailed studies of these particles have been undertaken only in the last few years. The launch of Vela 2 in July 1964 initiated the first extensive survey of the low-energy electron population. Observations with electrostatic analyzers aboard the Vela satellites (Bame et al., 1966, 1967) showed that the low-energy electrons form part of a plasma sheet stretching across the tail of the magnetosphere, with a broad, quasi-thermal, non-Maxwellian energy spectrum peaked in the vicinity of 1 keV. However, the orbits of the Vela satellites are circular and hence all their observations are confined to geocentric radial distances near 17 R E (earth radii). A complementary survey of low-energy electrons, to study their distribution in radial distance, first became possible a few months after Vela 2, with the launch of OGO-1 into a highly eccentric orbit on September 5, 1964; this satellite carries, among its many experiments, a Faraday cup to detect electrons in the 100 eV – 2 keV range. I shall be reporting results obtained with this detector and a similar one flown two years later on OGO-3.

Keywords

Plasma Sheet Electron Flux Auroral Zone Magnetic Local Time Dusk Side 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Angerami, J. J. and Carpenter, D. L.: 1966, ‘Whistler Studies of the Plasmapause in the Magnetosphere, 2: Electron Density and Total Tube Electron Content near the Knee in Magnetospheric Ionization’, J. Geophys. Res. 71, 711–725.ADSGoogle Scholar
  2. Axford, W. I.: 1967, ‘Magnetic Storm Effects associated with the Tail of the Magnetosphere’, Space Sci. Rev. 7, 149–157.ADSCrossRefGoogle Scholar
  3. Axford, W. I., Petschek, H. E., and Siscoe, G. L.: 1965, ‘Tail of the Magnetosphere’, J. Geophys. Res. 70, 1231–1236.ADSzbMATHCrossRefGoogle Scholar
  4. Bame, S. J., Asbridge, J. R., Felthauser, H. E., Olson, R. A., and Strong, I. B.: 1966, ‘Electrons in the Plasma Sheet of the Earth’s Magnetic Tail’, Phys. Rev. Letters 16, 138–142.ADSCrossRefGoogle Scholar
  5. Bame, S. J., Asbridge, J. R., Felthauser, H. E., Hones, E. W., and Strong, I. B.: 1967, ‘Characteristics of the Plasma Sheet in the Earth’s Magnetotail’, J. Geophys. Res. 72, 113–129.ADSCrossRefGoogle Scholar
  6. Binsack, J. H.: 1967, ‘Plasmapause Observations with the M.I.T. Experiment on IMP-2’, J. Geophys. Res. 72, 5231–5237.ADSCrossRefGoogle Scholar
  7. Carpenter, D. L.: 1966, ‘Whistler Studies of the Plasmapause in the Magnetosphere, 1 : Temporal Variations in the Position of the Knee and Some Evidence on Plasma Motions near the Knee’, J. Geophys. Res. 71, 693–709.ADSGoogle Scholar
  8. Cladis, J. B.: 1967, ‘Motion of Geomagnetic Flux Tube resulting from Injection of Hot Plasma (abstract)’, Trans. A.G.U. 48, 157.Google Scholar
  9. Dessler, A. J. and Juday, R. D.: 1965, ‘Configuration of Auroral Radiation in Space’, Planetary Space Sci. 13, 63–72.ADSCrossRefGoogle Scholar
  10. Frank, L. A.: 1965, ‘A Survey of Electrons > 40 keV beyond 5 Earth Radii with Explorer 14’, J. Geophys. Res. 70, 1593–1626.ADSCrossRefGoogle Scholar
  11. Gringauz, K. I., Kurt, V. G., Moroz, V. I., and Shklovskii, I. S.: 1960, ‘Results of Observations of Charged Particles Observed out to R = 100000 km with the Aid of Charged-Particle Traps on Soviet Space Rockets’, Astron. Zh. 37, 716–735. (English translation: Soviet Astron. - AJ 4, 1961, 680–695).ADSGoogle Scholar
  12. Gringauz, K. I., Bezrukikh, V. V., Musatov, L. S., Rybchinsky, R. E., and Sheronova, S. M.: 1964, ‘Measurements Made in the Earth’s Magnetosphere by Means of Charged Particle Traps aboard the Mars 1 Probe’, in Space Res., vol. IV (ed. by P. Muller), North-Holland Publishing Company, Amsterdam, pp. 621–626.Google Scholar
  13. Heppner, J. P.: 1967, ‘Recent Measurements of the Magnetic Field in the Outer Magnetosphere and Boundary Regions’, Space Sci. Rev. 7, 166–190.ADSCrossRefGoogle Scholar
  14. Heppner, J. P., Sugiura, M., Skillman, T. L., Ledley, B. G., and Campbell, M.: 1967, ‘OGO-A Magnetic Field Observations’, J. Geophys. Res. 72, 5417–5471.ADSCrossRefGoogle Scholar
  15. Ness, N. F.: 1965, ‘The Earth’s Magnetic Tail’, J. Geophys. Res. 70, 2989–3003.ADSCrossRefGoogle Scholar
  16. Serlemitsos, P.: 1966, ‘Low-Energy Electrons in the Dark Magnetosphere’, J. Geophys. Res. 71, 61–77.ADSGoogle Scholar
  17. Sugiura, M. and Heppner, J. P.: 1965, ‘The Earth’s Magnetic Field’, in Introduction to Space Science (ed. by W. Hess), Gordon and Breach, New York, pp. 5–92.Google Scholar
  18. Taylor, H. A., Jr., Brinton, H. C., and Smith, C. R.: 1965, ‘Positive Ion Composition in the Magnetoionosphere obtained from the Ogo-A Satellite’, J. Geophys. Res. 70, 5769–5781.ADSCrossRefGoogle Scholar
  19. Vasyliunas, V. M.: 1966, ‘Observations of 50- to 2000-eV Electrons with OGO-A (abstract)’, Trans. A.G.U. 47, 142. — Observations of low energy electrons with the OGO-A satellite, Ph.D. thesis, M.I.T.Google Scholar
  20. Vasyliunas, V. M.: 1968, ‘A Survey of Low Energy Electrons in the Evening Sector of the Magnetosphere with OGO-1 and OGO-3’, J. Geophys. Res. 73, 2839–2884.ADSCrossRefGoogle Scholar

Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1968

Authors and Affiliations

  • Vytenis M. Vasyliunas
    • 1
  1. 1.Laboratory for Nuclear Science and Physics DepartmentMassachusetts Institute of TechnologyCambridgeUSA

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