Possible theoretical explanations for occasional days of non-field-aligned diffusion at neutron monitor energies

Details Possible theoretical explanations for occasional days of non-field-aligned diffusion at neutron monitor energies Possible theoretical explanations for occasional days of non-field-aligned diffusion at neutron monitor energies

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....3..899f&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 3. (A76-26851

Physics

2

Cosmic Rays, Diurnal Variations, Interplanetary Magnetic Fields, Neutron Scattering, Particle Diffusion, Anisotropy, Monitors, Particle Energy, Plasma-Particle Interactions, Solar Wind

Scientific paper

It has been shown previously (Anath et al., 1973 and Kane, 1974) that 20 to 25% of days, the diffusion component of the cosmic-ray neutron diurnal anisotropy is directed more than 30 degrees away from the ecliptic projection of the interplanetary magnetic field averaged over the same 24 hours. A number of explanations for this deviation are discussed and it is concluded that transverse gradient drifts due to gradients perpendicular to the ecliptic are likely, that diurnal variations in the diffusion component of the neutron anisotropy may affect results from single stations and that the 24 hour mean interplanetary magnetic field may not be the field appropriate to the streaming equation at neutron monitor energies.

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