Substorm variations of the magnetotail plasma sheet fromXSM≈ −6REtoXSM≈ −60RE
作者:
E. W. Hones,
J. R. Asbridge,
S. J. Bame,
S. Singer,
期刊:
Journal of Geophysical Research
(WILEY Available online 1973)
卷期:
Volume 78,
issue 1
页码: 109-132
ISSN:0148-0227
年代: 1973
DOI:10.1029/JA078i001p00109
数据来源: WILEY
摘要:
We report a study of the substorm‐related variations of the magnetotail plasma sheet. The study uses data, much of it previously published, obtained by Vela and Imp satellites in the range −6RE>XSM>−60RE, whereXSMis geocentric distance measured along the solar magnetosphericxaxis. Evidence is presented that the thickening or recovery of the plasma sheet, which has been shown in Vela satellite measurements (atγ≈ 18RE) to occur late in substorms, is causally related to a rapid poleward shift or ‘leap’ of the principal current of the auroral electrojet evidenced by recovery of magnetic bays at auroral latitudes (65° ≲ λm≲ 70°) and their onset at low polar cap latitudes (e.g., λm≈ 74°). That is, it appears to be inaccurate to regard the thickening of the plasma sheet in the far magnetotail as a process that commences near the earth at the onset of the expansive phase of a substorm and moves more or less uniformly out into the tail as the expansive phase of the substorm evolves. A schematic description of the responses of the plasma sheet to a substorm, based on this study and previou
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