THE COSMIC-RAY FLARE EFFECT. 2. THE FLARE EFFECTS OF MAY 4, NOVEMBER 12, AND NOVEMBER 15, 1960
Journal Article
·
· J. Geophys. Research
Observatuions of the flare effects of May 4 and November 12 and 15, 1960, are analyzed. Attention is given to understandding the anisotropies that existed in the cosmicray fluxes during the events. For each event it is found that the flux was greatest from a direction to the west of the sun. During the May 4 event the flux was greatest from, and symmetrical about, a direction 55 deg to the west of the sun, and 10 deg north of the ecliptic, for more than 9 hours after the culated to be -5.0 at 1045 UT, and shown to be decreasing (that is, the spectrum steepening) with time. For the November 12 event, it is shown that an anisotropy persisted until about 1900 UT, when the radiation rapiddly became isotropic. At this same time, the counting rates of all neutron detectors increased very suddenly and a Forbush decrease was observed by meson detectors. It is shown that at about 1600 UT an additional anisotropic flux of radiation arrived at the earth from within the hemisphere centered upon the sun, and between 1700 andd 1800 UT an additional anisotropic flux arrived from the opposite direction. For thc November 15 event, it is shown that the radiatior became isotropic within about 90 minutes of the commencenment of the flare effect. The anisotropies at early times are studied, the most important observation being that particles were arriving from some directions in space for approximately 30 minutes before any arriving from the opposite direction. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-16-010783
- OSTI ID:
- 4792438
- Journal Information:
- J. Geophys. Research, Journal Name: J. Geophys. Research Vol. Vol: 67
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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