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

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

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2597o&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 16, p. 2597-2600

Physics

20

Interplanetary Physics: Solar Cycle Variations, Interplanetary Physics: Solar Wind Plasma, Global Change: Solar Variability

Scientific paper

Solar wind parameters, such as magnetic field strength B, plasma density ρ and bulk speed v correlate with solar cycle measured by sunspot numbers SSN. Using hourly data in the solar wind near the Earth, we show that the energy density ratio QI=(B2/8π)/(ρv2/2) has a correlation coefficient (cc) with SSN which is appreciably higher than for each of B, ρ and v taken separately. The proposed quasi-invariant is related to magnetic Mach number MA(QI=MA-2). The yearly median QI for the last 28 years holds a linear relation with SSN with high cc=0.98, which makes it the best index of solar activity derived from solar wind parameters so far.

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