Correlation of Solar Wind Density and Speed between the Spacecraft SoHO and Wind

Details Correlation of Solar Wind Density and Speed between the Spacecraft SoHO and Wind Correlation of Solar Wind Density and Speed between the Spacecraft SoHO and Wind

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh51a..01o&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH51A-01

Physics

2159 Plasma Waves And Turbulence

Scientific paper

Correlations between solar wind measurements made on the spacecraft SoHO and Wind over the period from 1996, the minimum of solar cycle 23, through the end of 2005 are discussed. During this period SoHO was located at L1, 200 RE from the earth, while Wind, launched in November 1994, has spent most of the time in the interplanetary medium at distances of more than 100 RE from the earth. We have calculated in two-hour increments correlation coefficients for solar wind density and speed measured at the two spacecraft and find the yearly means of these show a decrease of 8% from solar minimum to solar maximum, while the sunspot number increased by more than an order of magnitude. During 2001 and 2003 when Wind was in a distant prograde orbit, and the two spacecraft were separated by ±400 RE, the correlation coefficients, averaged over 30 days on each side of the XGSE axis, were equal to within measurement uncertainty, indicating a scale length for density in the interplanetary medium of at least 400 RE. Yearly histograms of correlation coefficients for solar wind density are found to be bimodal, suggesting the existence of two distinct solar wind conditions. The larger correlations appear to be due to discontinuities and shocks, while the smaller are likely due to Alfvenic turbulence. The two populations suggest that the solar wind consists of generic turbulence from quiet sun regions interspersed with highly filamentary structures convected from regions near the solar surface. These bimodal distributions are less evident in the solar wind speed correlations.

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