Correlation of High Latitude Coronal Holes with Solar Wind Streams High Above or Below the Ecliptic

This report has correlated the positions of high latitude coronal holes as determined from the Helium 10830 A spectroheliograms, with the velocities of solar wind streams high above or below the ecliptic, which could have originated from the same positions as the coronal holes. The solar wind speeds...

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Bibliographic Details
Main Authors: Baker,Kile B, Papagiannis,Michael D
Format: Report
Language:English
Subjects:
Astrophysics
Coronal holes
HIGH LATITUDES
INTERPLANETARY SPACE
PE61102F
SCINTILLATION
SOLAR CORONA
SOLAR WIND
SPECTROHELIOGRAPHS
WIND VELOCITY
WUAFGL2311G3BB
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Summary:This report has correlated the positions of high latitude coronal holes as determined from the Helium 10830 A spectroheliograms, with the velocities of solar wind streams high above or below the ecliptic, which could have originated from the same positions as the coronal holes. The solar wind speeds were determined from interplanetary scintillation (IPS) measurements made at the University of California at San Diego and at the Toyokawa Observatory in Japan. The correlation covered the two and a half year period, January 1, 1977 to June 30, 1979, during which there were no large equatorial coronal holes present, since we were approaching solar maximum. We have found that these high latitude coronal holes are often, but not always, correlated to high speed solar wind streams. The lack of a clearer correlation can be attributed to uncertainties in the solar wind velocities obtained from IPS measurements, to uncertainties in the exact boundaries of the coronal holes, and to the deflection or attenuation of relatively weak solar wind streams in interplanetary space.