Dependence of rigidity spectrum of solar semidiurnal variation of cosmic rays on the polarity state of polar magnetic field of the sun

Details Dependence of rigidity spectrum of solar semidiurnal variation of cosmic rays on the polarity state of polar magnetic field of the sun Dependence of rigidity spectrum of solar semidiurnal variation of cosmic rays on the polarity state of polar magnetic field of the sun

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1421n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1421-1431.

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6

Diurnal Variations, Polarized Radiation, Solar Cosmic Rays, Solar Magnetic Field, Solar Spectra, Muons, Solar Activity Effects, Telescopes

Scientific paper

Using data of cosmic ray muon intensities observed with the 17 directional telescopes at Nagoya during the period 1971-1988, the long-term modulation of the cosmic ray anisotropy of solar origin responsible for the solar semidiurnal variation has been studied. It is found that the 17 semidiurnal harmonic vectors suddenly change their relative configuration from a proper type to another on the harmonic dial for the polarity reversal of the polar magnetic field of the sun from 'positive' to 'negative' state, which occurred in the period 1979-1980, and the new type of the configuration has continued until now for all the negative state, even in the period of the minimum solar activity (1986). Using the coupling coefficients of the semidiurnal variation for various rigidity spectra, it is found that such a configuration change is due to the spectrum change of the anisotropy from 'soft' to 'hard'.

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