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Pioneer and Voyager observations of the solar wind at large heliocentric distances and latitudesData obtained from the electrostatic analyzers aboard the Pioneer 10 and 11 spacecraft and from the Faraday cup aboard Voyager 2 were used to study spatial gradients in the distant solar wind. Prior to mid-1985, both spacecraft observed nearly identical solar wind structures. After day 150 of 1985, the velocity structure at Voyager 2 became flatter, and the Voyager 2 velocities were smaller than those observed by Pioneer 11. It is suggested that these changes in the solar wind at low latitudes may be related to a change which occurred in the coronal hole structure in early 1985.
Document ID
19890045672
Document Type
Reprint (Version printed in journal)
Authors
Gazis, P. R. (NASA Ames Research Center; Mycol, Inc. Moffett Field, CA, United States)
Mihalov, J. D. (NASA Ames Research Center Moffett Field, CA, United States)
Barnes, A. (NASA Ames Research Center Moffett Field, CA, United States)
Lazarus, A. J. (MIT Cambridge, MA, United States)
Smith, E. J. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 14, 2013
Publication Date
March 1, 1989
Publication Information
Publication: Geophysical Research Letters
Volume: 16
ISSN: 0094-8276
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NGL-22-009-015
CONTRACT_GRANT: NAG5-584
CONTRACT_GRANT: NAS2-12376
PROJECT: PROJECT VOYAGER
OTHER: JPL-957781
Distribution Limits
Public
Copyright
Other