Spatial extent and dynamics of a thin current sheet during the substorm growth phase on December 10, 1996

T.I. Pulkkinen, DN Baker, LL Cogger, LA Frank, JB Sigwarth, S Kokubun, T Mukai, HJ Singer, JA Slavin, L Zelenyi

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Multispacecraft observations are analyzed to examine the dynamics of thin current sheet evolution during the early phases of a substorm during the period 0630-0800 UT on December 10, 1996, The ground signatures showed two activations, one latitudinally localized at 0731 UT and another, larger expansion around 0800 UT. A local model consisting of two current sheets (a thin current sheet and a thicker plasma sheet) was developed utilizing two-spacecraft magnetic field measurements within the magnetotail. Extension of the thin current sheet model to the inner magnetotail shows that during most of the growth phase, the thin current sheet intensified simultaneously and at the same fate in the mid- magnetotail (similar to 30 R-E) and near geosynchronous orbit. These results show that a thin current sheet extended from the near-geostationary region to the midtail, and that the entire current sheet responded to the driving in a coherent way. Furthermore, timings suggest that the onset-associated disturbances were observable in the midtail before the ground or geosynchronous signatures.

Original languageEnglish
Pages (from-to)28475-28490
Number of pages16
JournalJournal of Geophysical Research
Volume104
Issue numberA12
DOIs
Publication statusPublished - 1 Dec 1999
MoE publication typeA1 Journal article-refereed

Keywords

  • MAGNETIC-FIELD MODEL
  • BURSTY BULK FLOWS
  • PLASMA SHEET
  • TAIL
  • MAGNETOSPHERE
  • MAGNETOTAIL
  • RECONNECTION
  • GEOTAIL

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