Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207..989p&link_type=abstract
Astrophysical Journal, vol. 207, Aug. 1, 1976, pt. 1, p. 989-993.
Astronomy and Astrophysics
Astrophysics
2
Annual Variations, Cosmic Rays, Galactic Radiation, Interplanetary Medium, Convection, Diffuse Radiation, Fourier Analysis, Interplanetary Magnetic Fields, Radiant Flux Density, Solar Orbits
Scientific paper
Annual and semiannual variations of the galactic cosmic rays and estimates of their radial derivatives have been used to determine the most significant terms at 1 AU in the convection-diffusion equation. It turns out that both the changes in sign and the absolute value of the semiannual variation may be explained through the interplay of convection, diffusion across magnetic field lines, and drift. Indeed, such sign changes seem to be associated with reversals of the sign in the predominant polarity of the interplanetary magnetic field.
Antonucci Ester
Perona G. E.
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