Correlated dynamical changes in the near-earth and distant magnetotail regions: ISEE 3
Journal Article
·
· J. Geophys. Res.; (United States)
During October 1982 and January-March 1983, ISEE 3 made its first traversals of the distant (r = 60-220 R/sub E/) geomagnetic tail. Throughout this period the Los Alamos ISEE 3 plasma electron instrument detected the tailward magnetosheath, magnetopause, plasma sheet, and tail lobes. For the entire tail traversal period, nearly continuous concurrent data were available from Los Alamos charged-particle analyzer instruments on board the spaecraft 1977-007, 1981-025, and 1982-019 at geostationary orbit (6.6 R/sub E/). Using these geostgationary orbit data in the local midnight sector, numerous substorm particle injection events were detected, allowing substorm onset determinations to accuracies of a few minutes. Remarkably high degrees of correlation between near-earth substorm events and ISEE 3 transitions from one magnetotail plasma regime to another were often found throughout the tail crossing. Particularly notable were periods of ''taillike'' magnetic field stretching at 6.6 R/sub E/ (substrom growth phases) and diametrical expansions of the distant tail seen by ISEE 3. Similarly, substorm expansion onsets seen at 6.6 R/sub E/ were followed by rapid apparent contractions of the translunar tail which took ISEE 3 into magnetosheath and/or boundary layer plasmas. At ISEE 3 distances beyond approx.200 R/sub E/ it is commonly observed that substgorm particle injection events at 6.6 R/sub E/ precede the occurrence of strong tailward plasma flow by approx.25 +- 5 min.
- Research Organization:
- Los Alamos National Laboratory, University of California
- OSTI ID:
- 6858978
- Journal Information:
- J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 89:A6; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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