Azimuthal modulation of the event rate of cosmic ray extensive air showers by the geomagnetic field

Details Azimuthal modulation of the event rate of cosmic ray extensive air showers by the geomagnetic field Azimuthal modulation of the event rate of cosmic ray extensive air showers by the geomagnetic field

1999-03-23

arxiv.org/abs/astro-ph/9903337v1

JETP Lett. 69 (1999) 288-293

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures in ps files

Scientific paper

10.1134/1.568025

The Earth's magnetic field effect on the azimuthal distribution of extensive air showers (EAS) of cosmic rays has been evaluated using a bulk of the Yakutsk array data. The uniform azimuthal distribution of the EAS event rate is rejected at the significance level 10^(-14). Amplitude of the first harmonics of observed distribution depends on zenith angle as A1=0.2*sin^2(theta) and is almost independent of the primary energy; the phase coincides with the magnetic meridian. Basing upon the value of measured effect, the correction factor has been derived for the particle density depending on a geomagnetic parameter of a shower.

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