Solar wind composition from sector boundary crossings and coronal mass ejectionsUsing the Ion Composition Instrument (ICI) on board the ISEE-3/ICE spacecraft, average abundances of He-4, He-3, O, Ne, Si, and Fe have been determined over extended periods. In this paper the abundances of He-4, O, Ne, Si, and Mg obtained by the ICI in the region of sector boundary crossings (SBCs), magnetic clouds and bidirectional streaming events (BDSs) are compared with the average abundances. Both magnetic clouds and BDSs are associated with coronal mass ejections (CMEs). No variation of abundance is seen to occur at SBCs except for helium, as has already been observed. In CME-related material, the abundance of neon appears to be high and variable, in agreement with recent analysis of spectroscopic observations of active regions. We find that our observations can be correlated with the magnetic topology in the corona.
Document ID
19930049633
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ogilvie, K. W. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Coplan, M. A. (Maryland Univ. College Park, United States)
Geiss, J. (Bern Univ. Switzerland)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Solar Wind Seven; Proceedings of the 3rd COSPAR Colloquium, Goslar, Germany, Sept. 16-20, 1991 (A93-33554 13-92)