The main features of solar wind plasma correlations of importance to space weather strategy

Details The main features of solar wind plasma correlations of importance to space weather strategy The main features of solar wind plasma correlations of importance to space weather strategy

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64..737d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 5-6, p. 737-742.

Physics

2

Scientific paper

In this work solar wind measurements from several spacecraft were used to investigate the correlations of solar wind plasma parameters. These results provide a test of the concept of predicting space weather by monitoring the condition of the solar wind at a large distance (up to 230Re, the L1 point) upstream from the Earth. We compared the ion flux and bulk velocity time behavior measured by widely-separated spacecraft: the spacecraft pairs INTERBALL-1 and IMP 8 (separations up to 30Re), INTERBALL-1 and WIND, and IMP 8 and WIND (both with separations up to 250Re). The average value of the ion flux correlation coefficient is about 0.73. But in some cases the plasma parameters from two spacecraft are very different in both behavior and value, so correlations are very poor. The technique of multifactorial analysis was used to obtain the physical dependences of the correlations on the spacecraft separation and on different plasma and magnetic field parameters. We found that the correlation values have a weak but significant dependence on the separation perpendicular to the Sun-Earth line (YZse-separations up to 90Re). The most important factors influencing the correlation level are density (or ion flux) variability, the direction of the IMF vector to the Sun-Earth line (cone angle), and the solar wind bulk velocity.

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