Study of cosmic ray diurnal variation on a day-to-day basis

Details Study of cosmic ray diurnal variation on a day-to-day basis Study of cosmic ray diurnal variation on a day-to-day basis

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974prama...3...74a&link_type=abstract

Pramana, vol. 3, Aug. 1974, p. 74-88. Research supported by the Department of Space of India and National Academy of Sciences.

Computer Science

16

Anisotropy, Cosmic Rays, Diurnal Variations, Interplanetary Magnetic Fields, Particle Diffusion, Solar Wind, Convection Currents, Histograms, Interplanetary Medium, Long Term Effects, Magnetic Effects, Magnetic Field Configurations, Time Dependence

Scientific paper

Detailed analysis of the cosmic ray diurnal variation on a day-to-day basis to test the validity of a new concept which attributes this variation to variations in diffusion current. It is demonstrated that, on the average, the diurnal anisotropy of cosmic radiation may be completely understood as a superposition of simple convection and field-aligned diffusion. On a day-to-day basis, this concept holds good on more than 80% of the days investigated. On the remaining 20% of the days, transverse diffusion also plays an important role. On these days, the diurnal time of maximum shows a preference to occur either during early morning or late evening. Days on which transverse diffusion is predominant seem to occur in trains of two or more consecutive days. Such trains of days are usually associated with abrupt changes in the direction of the interplanetary magnetic field. The nonfield-aligned days are associated with the presence of large irregularities in the interplanetary magnetic field with scale sizes greater than four hours.

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