Forbush decrease of the flux of heavy primary nuclei of cosmic rays on May 12 and July 12, 1959

Biswas, S. (1961) Forbush decrease of the flux of heavy primary nuclei of cosmic rays on May 12 and July 12, 1959 Journal of Geophysical Research, 66 (9). pp. 2653-2657. ISSN 0148-0227

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Official URL: http://www.agu.org/journals/ABS/1961/JZ066i009p026...

Related URL: http://dx.doi.org/10.1029/JZ066i009p02653

Abstract

The time variation of the flux of heavy nuclei with Z ≥ 3 of primary cosmic radiation has been measured during seven balloon flights on May 6-12, 1959, and on July 10-12, 1959. Six of these flights were made from Minneapolis and one from Churchill, Canada. During a quiet day on May 6, 1959, the flux of these nuclei at the top of the atmosphere was 21.2 ± 2.3 particles/m2.sec.sr. After the orbush decrease on May 12, 1959, the value was 10.0 ۫ 4 particles/m2.sec.sr, showing a reduction of 53 ± 9 per cent of the primary heavy nuclei flux. On July 10-11, the flux of Z ≥ 3 nuclei at the top of the atmosphere as measured as 17.5 ± 1.7 particles/m2.sec.sr before the Forbush decrease and 10.0 ± 1.8 particles/m2.sec.sr after the Forbush decrease on July 12. The reduction was 43 ± 9 per cent during this event. The Deep River neutron monitor showed a reduction of counting rates of 12 and 7.5 per cent respectively during these two Forbush decrease events.

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