Physics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982nciml..33....9m&link_type=abstract
Nuovo Cimento, Lettere, Serie 2, vol. 33, Jan. 2, 1982, p. 9-13. Research sponsored by the Indian Space Research Organization.
Physics
1
Cosmic Rays, Interplanetary Magnetic Fields, Jupiter (Planet), Mesons, Particle Flux Density, Planetary Radiation, Diurnal Variations, Energetic Particles, Harmonic Analysis, Solar Cosmic Rays
Scientific paper
The question of whether any part of the high-energy cosmic rays observed at the earth originates at Jupiter is considered. A Chree analysis is presented for the differences of monthly average corrected meson intensities at Nagoya, Japan (vertical cut-off rigidity 11.5 GV) from the mean intensity, and a definite 13-month periodicity corresponding to the synodic period of Jupiter is noted. Examination of daily averages of cosmic ray intensity as a function of the relative positions of the earth and Jupiter reveals an increase in intensities when earth longitude in a reference system corotating with Jupiter with its center in the sun is between 150 and 290 deg, with a peak at 220 deg, when the earth and Jupiter are on the same magnetic field line. Analysis of the amplitude of the solar diurnal cosmic ray variation reveals a greater amplitude in the period most favorable for enhancement by cosmic rays from Jupiter than in the least favorable period. Results thus support the view that Jupiter is a source of high-energy cosmic rays which travel along the magnetic field line to earth.
Bose Saurabh K.
Ganguly S. R.
Mitra Bivas
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