Physics – Plasma Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1447f&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 8, p. 1447-1450
Physics
Plasma Physics
6
Interplanetary Physics: Solar Cycle Variations, Interplanetary Physics: Solar Wind Plasma, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Space Plasma Physics
Scientific paper
The recently suggested solar wind quasi-invariant [QI≡(B2/8π)/(ρv2/2)] is a combination of magnetic field strength B, plasma density ρ and solar wind speed v. Measured in the solar wind near the Earth, the median value of QI was shown to be a reliable index of solar activity for the 28 year period holding a linear relation with sunspot numbers (SSN) with a high correlation coefficient (cc) of 0.98 [Osherovich, Fainberg and Stone, 1999]. Here, using hourly data from the Pioneer Venus Orbiter for the period from 1978-1988, we demonstrate that QI near Venus also closely follow SSN with a correlation coefficient of 0.94 for the yearly mean values. We found that the calibration coefficient between QIVenus and QIEarth is slightly larger than unity, namely, QIVenus=a*.QIEarth where a*=1.134+/-0.001. We suggest that, for any point in the heliosphere, QI can be viewed as a useful measure of solar activity.
Fainberg Joe
Osherovich Vladimir A.
Stone Robert G.
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