Correlation of Solar Wind Features Observed From Spacecraft Well-Separated in YGSE

Details Correlation of Solar Wind Features Observed From Spacecraft Well-Separated in YGSE Correlation of Solar Wind Features Observed From Spacecraft Well-Separated in YGSE

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh21c0436l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH21C-0436

Physics

7899 General Or Miscellaneous, 2100 Interplanetary Physics, 2102 Corotating Streams, 2164 Solar Wind Plasma

Scientific paper

How can we improve the predictive capabilities of pairs of LWS Sentinal observers? One contribution is the determination of the correlation and time delay of similar features in the solar wind observed from spacecraft well-separated in YSE (e.g., Wind and ACE in 2000 to 2001). Such correlation can yield information about the variability of the solar source of the wind as well as about evolution of the features between the observing points. If the source of the features were time-independent, one would expect features other than shocks to be corotating with the Sun and thus normals to their fronts would be aligned perpendicular to the Parker spiral. But earlier studies by our group as well as by others have indicated that the normals to the fronts lie between radial and the direction expected for corotation. Thus our goal is to.establish the nature of corotating vs. features with radially-oriented normals. By eliminating shocks and by insisting that the features show good, simultaneous correlation in at least three parameters (among velocity, density, thermal speed, and magnetic field) as well as pressure-balance, we have identified a set of features that are clearly corotating. Without such stringent selection criteria, we reproduce the results of earlier studies which show that the average alignment of normals to the fronts of correlated features to be between radial and that expected for corotation. We also examine several events with excellent correlations with delays that fall outside the range expected for either corotating or radial features.

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