Spurious sidereal daily variation of cosmic rays produced from stationary anisotropy of solar origin

Details Spurious sidereal daily variation of cosmic rays produced from stationary anisotropy of solar origin Spurious sidereal daily variation of cosmic rays produced from stationary anisotropy of solar origin

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ncimc...6..550n&link_type=abstract

Nuovo Cimento C, Serie 1, vol. 6C, Sept.-Oct. 1983, p. 550-565.

Physics

8

Cosmic Ray Showers, Diurnal Variations, Galactic Cosmic Rays, Interplanetary Magnetic Fields, Sidereal Time, Solar Terrestrial Interactions, Anisotropy, Ecliptic, Magnetic Rigidity, Particle Flux Density

Scientific paper

Several types of cosmic-ray (CR) sidereal diurnal variations (SDV) produced by stationary CR anisotropy of solar origin due to the obliquity of the ecliptic are considered, including the sector-structure-dependent SDV produced from the CR radial density gradient and the N-S asymmetric SDV produced from the bidirectional anisotropy responsible for the solar semidiurnal variation. Due to the obliquity, these variations show the characteristic eigenphase of 18 or 6 hours in sidereal time, depending on the kind of sector structure for the former and on the observation site for the latter. However the above eigenphase is only approximate and, when the effect of the inclination of the solar equatorial plane against the ecliptic plane on these variations is considered, the eigenphase lags by about 0.5 to 0.7 h, depending on the type of variation. An exact representation of these variations is given with the aim of eliminating them from the observed sidereal variation in order to determine the CR galactic anisotropy.

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