Bidirectional approximately 1 MeV AMU -1 Ion Intervals in 1973--1991 Observed by the Goddard Space Flight Center Instruments on IMP 8 and ISEE 3/ICE
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.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- April 1993
- DOI:
- 10.1086/191769
- Bibcode:
- 1993ApJS...85..411R
- Keywords:
-
- Interplanetary Medium;
- Ion Motion;
- Satellite Observation;
- Satellite-Borne Instruments;
- Solar Flux Density;
- Solar Wind;
- Explorer 50 Satellite;
- International Sun Earth Explorers;
- Solar Physics;
- SUN: SOLAR WIND;
- SUN: PARTICLE EMISSION