On the correlation of coronal green-line intensity and solar wind velocity |
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Authors: | E. C. Roelof S. Cuperman A. Sternlieb |
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Affiliation: | (1) Applied Physics Laboratory, The Johns Hopkins University, Silver Spring, Md., U.S.A.;(2) Dept. of Physics and Astronomy, Tel Aviv University, Ramat-Aviv, Israel |
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Abstract: | Cross-correlation functions have been computed between green-line intensity (Kislovodsk) and Vela solar wind velocity January–June 1967. They are calculated separately for east and west limb observations in 5° latitude increments, and the solar wind velocites are correlated at their estimated emission times by correcting for the plasma Earth-Sun transit time using the observed velocities. The cross-correlation patterns appear to be dominated by two competing effects: a tendency of quasi-stationary green-line emission and solar wind velocity to anti-correlate; and a tendency of transient green-line emission and solar wind velocity enhancements to correlate positively. We also find evidence for simultaneous (same-day) emission brightenings over 2 to 4 limb quadrants. It is therefore recommended that, following a well-known practice in solar terrestrial studies, recurrent and transient events in both solar wind and green-line emissions should be studied separately. |
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