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Sectorial anisotropy of solar cosmic rays

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Abstract

A hitherto unobserved sectorial pattern of anisotropy that was limited to a narrow and stable region was displayed by the ground level event (GLE) of January 24, 1971. For the entire 11/2 h interval following onset before isotropy set in, the anisotropy was limited to a 10° cone centered about 60° from the spiral magnetic field line. It is also the first solar particle event for which it is possible, by analytical procedures based upon a theoretical propagation model, to distinguish between two rival candidates for the parent flare.

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Authors and Affiliations

  1. Bartol Research Foundation of the Franklin Institute, Swarthmore, Pa., U.S.A.

    S. P. Duggal & M. A. Pomerantz

Authors
  1. S. P. Duggal
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  2. M. A. Pomerantz
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Additional information

This research was sponsored by the National Science Foundation and Air Force Cambridge Research Laboratories, Office of Aerospace Research, under Contract No. F19628-70-C-0190, but the report does not necessarily reflect endorsement by the sponsor.

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Duggal, S.P., Pomerantz, M.A. Sectorial anisotropy of solar cosmic rays. Sol Phys 27, 227–241 (1972). https://doi.org/10.1007/BF00151787

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  • DOI: https://doi.org/10.1007/BF00151787

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