North-South asymmetry in the electron and proton fluxes: dependences on their energy and on solar activity

Details North-South asymmetry in the electron and proton fluxes: dependences on their energy and on solar activity North-South asymmetry in the electron and proton fluxes: dependences on their energy and on solar activity

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.3948g&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The value and sign of the North-South asymmetry in the electron and proton fluxes of low (Ee = 0.19-3.0 MeV, Ep = 1.0-60.0 MeV) and high (Ee ≥7.0 MeV, Ep ≥ 500.0 MeV) energies are studied as dependent on the particle energy. The Cosmos-900, Ohzora, and Intercosmos-19 (polar caps) data are used. The North-South asymmetry value and sign are treated to depend on solar activity and on the IMF sector structure and sign (Gorchakov et al.,1987). The high-energy data show that concentrations of galactic cosmic rays in the northern and southern heliosphere may be different with the excess value and sign being dependent on particle energy. The IMF sector structure effect reduces usually to variations in the value, rather than sign, of the asymmetry (Gorchakov et al., 1997). The North-South asymmetry in the low-energy electron fluxes is mostly negative during positive Bz and sunward IMF (Gorchakov et al.,1995). The value of the asymmetry in galactic cosmic rays has been found to increase little with rising energy, and the asymmetry sign to reverse during the solar maximum. The asymmetry sign of the low-energy electron fluxes is predominantly opposite in phase to the highand lowenergy proton fluxes. The drift effects are assumed to depend on the product of the signs of particle charge and IMF sector, rather than on either of the signs separately.The results are compared with the ballon and satellite Meteor measurements in 1977-2000 years.

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