Pitch-angle dependence of cosmic-ray percentage modulation in interplanetary space

Details Pitch-angle dependence of cosmic-ray percentage modulation in interplanetary space Pitch-angle dependence of cosmic-ray percentage modulation in interplanetary space

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978izyak..42.1043d&link_type=abstract

(Vsesoiuznaia Konferentsiia po Kosmicheskim Lucham, Yakutsk, USSR, June 1977.) Akademiia Nauk SSSR, Izvestiia, Seriia Fizicheska

Physics

Cosmic Rays, Forbush Decreases, Pitch (Inclination), Interplanetary Magnetic Fields, Magnetically Trapped Particles, Solar Wind

Scientific paper

Spectroscopic data collected in the stratosphere are used to study the pitch-angle dependence of the percentage modulation of galactic cosmic rays during a Forbush decrease. The results obtained demonstrate that modulation amplitude depends significantly on the pitch angle of cosmic-ray particles in the interplanetary magnetic field during Forbush decreases. Based on the results, it is suggested that: (1) field structures similar to magnetic traps and with a characteristic size exceeding 1 AU are formed in the region of earth's orbit during Forbush decreases and might be produced by high-speed solar-wind streams; (2) the degree of regularity of the interplanetary magnetic field outside the traps is relatively high; (3) modulation is due to particle cooling during propagation in the regular solar-wind fields; and (4) the difference in modulation amplitude at large and small pitch angles may be explained by a difference between the cooling times of trapped and propagating particles.

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