Solar Diurnal Anisotropy of Cosmic Rays

Details Solar Diurnal Anisotropy of Cosmic Rays Solar Diurnal Anisotropy of Cosmic Rays

Aug 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.223..601j&link_type=abstract

Nature, Volume 223, Issue 5206, pp. 601-602 (1969).

Computer Science

2

Scientific paper

THE solar diurnal anisotropy of cosmic rays is attributed to the bulk streaming of the cosmic ray gas caused by the corotating interplanetary magnetic field that is ``rigidly attached to the Sun''1,2. By analogy with the classical Compton-Getting effect3, a(R), the amplitude of the daily variation at magnetic rigidity R is related to the ratio of particle speed v and the bulk streaming velocity u where γ is the exponent of the differential spectrum. Because, at the orbit of the Earth, u~450 km s-1 a neutron monitor with mean rigidity of response about 10 GeV and atmospheric threshold 1 GeV should observe an amplitude extrapolated through the atmosphere to free space of about 0.7 per cent.

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