CORRELATED DYNAMICAL CHANGES IN THE NEAR-EARTH AND DISTANT MAGNETOTAIL REGIONS: ISEE 3.

During October 1982 and January-March 1983, ISEE 3 made its first traversals of the distant (r equals 60-220 R//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 geostationary satellites (6. 6 R//E). Using these geostationary 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. Similarly, substorm expansion onsets seen at 6. 6 R//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 approximately 200 R//E it is commonly observed that substorm particle injection events at 6. 6 R//E precede the occurrence of strong tailward plasma flow by approximately 25 plus or minus 5 min. These results suggest a close relationship between processes in the near-earth plasma sheet and the distant tail during substorms.