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GEOMAGNETIC EFFECT ON DIURNAL VARIATION OF COSMIC RAY INTENSITY

Kazuaki Murakami

Abstract

It is assumed that the geomagnetic dipole axis is inclined with respect to the axis of the earth's rotation and the effect of this inclination on the diurnal variation of cosmic ray intensity is studied. This effect is plainly noticeable in the longitudinal dependence of the phase of the diurnal variation. Observed times of intensity maximum on a map and calculated times on the same map do not coincide. It is concluded that the geomagnetic field in the exosphere is to some extent distorted. This distortion and its effect on the latitudinal and longitudinal dependences of the diurnal variation of cosmic ray intensity are discussed. (auth)

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Key concepts: Earth's magnetic field, Diurnal temperature variation, Intensity (physics), Cosmic ray, Physics, Variation (astronomy), Geomagnetic pole, Geomagnetic secular variation