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Latitude dependence of solar wind velocity observed at not less than 1 AUThe large-scale solar wind velocity structure in the outer heliosphere has been systematically analyzed for Carrington rotations 1587-1541 (March 1972 to April 1976). Spacecraft data were taken from Imp 7/8 at earth, Pioneer 6, 8, and 9 near 1 AU, and Pioneer 10 and 11 between 1.6 and 5 AU. Using the constant radial velocity solar wind approximation to map all of the velocity data to its high coronal emission heliolongitude, the velocity structure observed at different spacecraft was examined for latitudinal dependence and compared with coronal structure in soft X-rays and H-alpha absorption features. The constant radial velocity approximation usually remains self-consistent in decreasing or constant velocity solar wind out to 5 AU, enabling us to separate radial from latitudinal propagation effects. Several examples of sharp nonmeridional stream boundaries in interplanetary space (about 5 deg latitude in width), often directly associated with features in coronal X-rays and H-alpha were found.
Document ID
19810038514
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mitchell, D. G.
(NASA Ames Research Center Moffett Field, CA, United States)
Roelof, E. C.
(Johns Hopkins University Applied Physics Laboratory, Laurel, Md., United States)
Wolfe, J. H.
(NASA Ames Research Center Mountain View, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
Solar Physics
Accession Number
81A22918
Distribution Limits
Public
Copyright
Other

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