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Combined Ulysses Solar Wind and SOHO Coronal Observations of Several West Limb Coronal Mass EjectionsFrom October 1996 to January 1997, Ulysses was situated roughly above the west limb of the Sun as observed from Earth at a heliocentric distance of about 4.6 AU and a latitude of about 25 deg. This presents the first opportunity to compare Solar and Heliospheric Observatory (SOHO) limb observations of coronal mass ejections (CMEs) directly with their solar wind counterparts far from the Sun using the Ulysses data. During this interval, large eruptive events were observed above the west limb of the Sun by the Large Angle Spectrometric Coronagraph (LASCO) on SOHO on October 5, November 28, and December 21-25, 1996. Using the combined plasma and magnetic field data from Ulysses, the October 5 event was clearly identified by several distinguishing signatures as a CME. The November 28 event was also identified as a CME that trailed fast ambient solar wind, although it was identified only by an extended interval of counterstreaming suprathermal electrons. The December 21 event was apparently characterized by a six-day interval of nearly radial field and a plasma rarefaction. For the numerous eruptive events observed by the LASCO coronagraph during December 23-25, Ulysses showed no distinct, CMEs, perhaps because of intermingling of two or more of the eruptive events. By mapping the Ulysses observations back in time to the Sun assuming a constant flow speed, we have identified intervals of plasma that were accelerated or decelerated between the LASCO and Ulysses observations.
Document ID
20010038225
Document Type
Reprint (Version printed in journal)
Authors
Funsten, H. O. (Los Alamos Scientific Lab. NM United States)
Gosling, J. T. (Los Alamos Scientific Lab. NM United States)
Riley, P. (Science Applications International Corp. San Diego, CA United States)
St.Cyr, O. C. (Naval Research Lab. Washington, DC United States)
Forsyth, R. J. (Imperial College London United Kingdom)
Howard, R. A. (Naval Research Lab. Washington, DC United States)
Schwenn, R. (Max-Planck-Inst. fuer Aeronomie Katlenburg-Lindau, Germany)
Date Acquired
August 20, 2013
Publication Date
February 28, 2001
Publication Information
Publication: An Investigation of the Large Scale Evolution and Topology of Coronal Mass Ejections in the Solar Wind
Issue: Appedix 8
ISSN: 0148-0227
Subject Category
Solar Physics
Report/Patent Number
Paper-1988JA900088
Distribution Limits
Public
Copyright
Other