The spectrum and propagation of relativistic solar flare particles during July 17–18, 1959
Journal Article
·
· Journal of Geophysical Research
During this interval, one solar charged particle intensity increase was definitely observed before a sharp Forbush type decrease, and a second appeared likely following the decrease. These events were detected at sea level and at mountain altitudes. The first event followed the giant solar flare of July 16, and the solar particles appeared to arrive isotropically at the earth. The intensity time dependence of this event showed a slow rise-time comparable with its exponential decay. The integral rigidity spectrum for these particles was approximately (cp/ze)/sup -//sup 9/. The second event, although not uniquely determined as a solar flare event, followed some minor solar flare activity and might be explained by assuming an anisotropy (impact zones for the source in the solar direction) for several hours. The integral rigidity spectrum for this second event was (cp/ze)/sup -//sup 4//sup .//sup 5/. This sequence of intensity increases could be explained by the diffusion of solar particles from the July 16 flare through disordered magnetic fields to reach the earth isotropically. The effect of the mechanism for the subsequent Forbush intensity decrease is to smooth the interplanetary fields so as to leave behind only weak, regular flelds through which the fast moving solar particles of July 18 arrive anisotropically at the earth.
- Research Organization:
- Univ. of Chicago
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-020042
- OSTI ID:
- 4076240
- Journal Information:
- Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: 6 Vol. 66; ISSN 0148-0227
- Publisher:
- American Geophysical Union
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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