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Title:
Bidirectional about 1 MeV/amu ion intervals in 1973-1991 observed by the Goddard Space Flight Center instruments on IMP 8 and ISEE 3/ICE
Authors:
Richardson, I. G.; Reames, D. V.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 85, no. 2, p. 411-432. (ApJS Homepage)
Publication Date:
04/1993
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Interplanetary Medium, Ion Motion, Satellite Observation, Satellite-Borne Instruments, Solar Flux Density, Solar Wind, Explorer 50 Satellite, International Sun Earth Explorers
DOI:
10.1086/191769
Bibliographic Code:
1993ApJS...85..411R

Abstract

Bidirectional energetic ion flows (BIFs) in the solar wind at 1AU during 1973-1991 are examined on the basis of about 1 MeV/amu data from the Goddard Space Flight Center instruments on ISEE3/ICE and IMP 8. BIFs are observed more frequently around solar maximum, when they are observed about 12 percent of the time compared with about 5 percent at solar minimum. Intervals with durations greater than 4 hr are observed on average approximately every 3-4 d at solar maximum and every 2 wk at solar minimum, with about 33 percent of these intervals following within 2 d of an interplanetary shock. Various coronal mass ejection signatures and BIFs greater than 1 MeV/amu usually do not coincide exactly, and additional bidirectional ion events are identified.

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