Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3861s&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
We examine the dependence of the solar plasma parameters observed near 1 AU upon the level of solar activity during the 33-year period 1965-1997. The interplanetary magnetic field (IMF) strength B and all the other plasma parameters namely: solar wind speed V, temperature T, number flux NV and entropy S display obvious solar as well as magnetic cycle variations. The product VB and the geomagnetic activity as characterized by the index Ap display both of those cycles as well. All of these parameters are negatively correlated with the level of solar activity, they lead the solar activity by 1-3 years. They are also positively correlated, as they lag (except the IMF strength) the sunspot number by 2-3 years. The solar wind proton density N is positively correlated with both of its speed V and temperature T during the odd solar cycle and negatively correlated with them during even cycles. The product VB is more related to the geomagnetic activity than the other interplanetary parameters.
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