Solar wind quasi-invariant as a heliospheric index of solar activity

Details Solar wind quasi-invariant as a heliospheric index of solar activity Solar wind quasi-invariant as a heliospheric index of solar activity

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506...43f&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

1

Solar Activity, Solar Wind, Interplanetary Magnetic Field

Scientific paper

Interplanetary magnetic field strength B, solar wind speed v and plasma density ρ all vary with sunspot numbers (SSN). The corresponding correlation coefficients (cc) are not high enough to establish any of these parameters as a close proxy for SSN. In contrast, the solar wind quasi-invariant [QI ≡ (B2/8π)/(ρv2/2)] recently suggested by Osherovich, Fainberg and Stone [1999] has a high cc = 0.98 for the median yearly value for the 28 year period measured in the solar wind near the Earth (1 AU). For the period 1978-1989, Voyager 2 measured B, v and ρ from 2 AU to 27 AU. In this paper we show that in spite of the orders of magnitude change of B and ρ at large heliospheric distances, QI measured by Voyager 2 stayed in the same range and followed SSN similar to QI measured near the Earth and near Venus. These results supply an observational test for any MHD model of the solar wind throughout the heliosphere that attempts to include the effects of solar cycle variability.

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