Correlation of high latitude coronal holes with solar wind streams far above or below the ecliptiic

Physics

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Coronal Holes, Solar Wind, Solar Wind Velocity, Data Correlation, Interplanetary Space, Polar Regions, Scintillation, Synoptic Measurement

Scientific paper

For the 2.5-year period from January 1, 1977 to June 30, 1979, the positions of high latitude coronal holes, obtained from the He 10830 A synoptic maps, have been correlated with the velocities of solar wind streams, determined from interplanetary scintillation, that would have originated from these coronal holes. From 24 cases analyzed, it is found that these high latitude coronal holes are often, but not always, correlated with high speed solar wind streams. The lack of a much stronger correlation may be due to uncertainties in the boundaries of the coronal holes and in the velocities of the solar wind streams. It might also be due to the deflection or attenuation of relatively weak solar wind streams in interplanetary space.

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