The solar particle event of July 16–19, 1966 and its possible association with a flare on the invisible solar hemisphere |
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| Authors: | Helen W Dodson E Ruth Hedeman Stephen W Kahler Robert P Lin |
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| Institution: | (1) McMath-Hulbert Observatory, The University of Michigan, Pontiac, Mich., U.S.A.;(2) Space Sciences Laboratory, University of California, Berkeley, Calif., U.S.A. |
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| Abstract: | An energetic solar proton and electron event was observed by particle detectors aboard Explorer 33 (AIMP-1) and OGO-3 during the period July 16–19, 1966. Optical and radio observations of the sun suggest that these particles were produced by a flare which may have occurred on July 16 near the central meridian of the invisible hemisphere. The active region to which the flare is assigned is known to have produced the energetic particle events of July 7 and 28, 1966. The propagation of the particles in the July 16–19 event over the  180° extent of solar longitude from the flare to the earth is discussed, and it is concluded that there must exist a means of rapidly distributing energetic particles over a large area of the sun. Several possible mechanisms are suggested. |
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