Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973-1978

Details Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973-1978 Variability of the diurnal anisotropy of the cosmic ray intensity during the interval 1973-1978

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....8611093a&link_type=abstract

Journal of Geophysical Research, Volume 86, Issue A13, p. 11093-11097

Physics

3

Scientific paper

The diurnal ansiotropy of cosmic ray intensity has been investigated over the interval 1973-1978 by using neutron monitor data from Calgary, Deep River, Goose Bay, and Inuvik. It is observed that in general, the 27-day variation in the diurnal anisotropy is greater for the component perpendicular to the nominal interplanetary magnetic field (IMF) in comparison with the parallel (or field aligned) component, which has very little 'power'. However, the direction of the average anisotropy vector is aligned almost perpendicular (within the hour) to the IMF. The results are discussed in terms of alternate possibilities: the 'power' with 27-day period and its harmonics arise from fluctuations in the amplitude aligned in the direction (a) of the total vector itself (~16 hours) (b) perpendicular to the IMF.

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