Synthesis models of dayside field-aligned currents for strong interplanetary magnetic field by

Masakazu Watanabe, Takesi Iijima, Frederick J. Rich

Research output: Contribution to journalArticle

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Abstract

Using particle and magnetic field data acquired with DMSP-F6 and DMSP-F7 satellitesw, e have investigatedin terplanetarym agneticf ield (IMF) By dependenceo f the globalp attern of plasmar egime and field-alignedc urrents(FACs) on dayside high latitudes during strong IMF By (averaged |By| > 3.7 nT) andg eomagneticadllyis turbed (mainly IMF Bz < 0) periods. From particle data we have identified five plasma regimes: inner plasma sheet, outer plasma sheet, cleft, cusp, and mantle. All the plasma domains exceptt he inner plasmas heets howB y dependencein spatiald istribution.R egion 1 and “traditional cusp” currents appear in cusp/mantle domains, which we call midday region 1 and region 0 currents, r espectivelyi,n this paper. These currentsp erfectlyr everset heir flow directions depending on IMF By polarity. Traditional region 1 currents occurring in cleft and outer plasma sheet almost always flow into the ionosphere in the prenoon sector and flow awayf rom the ionospherein the postnoons ectorr egardlesso f By polarity. Thus the midday region 1 and region 0 current system that appears at local noon is not a simple continuation of flankside region 1/region 2 current system. Midday region 1 and region 0 currentsa re not necessarilyb alancedi n intensity;r egion 0 current intensityo ccasionally exceeds midday region 1 current intensity. Furthermore, intensity imbalance also appears in cleft-associatedre gion 1 currents;t hat is, region 1 current in the farside cleft from the reconnections ite (“downstreamsidec”l eft) is larger than region 1 current in the nearside cleft (“upstreamsidec” left). On the basiso f theseo bservationafla ctsw e discussth e sourcem echanismos f the daysideF AC system(1) directlyc oupledg enerationo f region0 and midday region 1 current in the cusp/mantle domainsa round noon and (2) generation of extra region 0 current in the tail magnetopausew hich is connectedt o the extra downs treamside cleft-associated region 1 current.

Original languageEnglish
Article number96JA00482
Pages (from-to)13,303-13,319
JournalJournal of Geophysical Research
Volume101
Issue numberA6
DOIs
Publication statusPublished - Jan 1 1996

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field aligned currents
interplanetary magnetic fields
magnetic fields
Magnetic fields
magnetic field
Plasmas
synthesis
cusps
IMF
tail
plasma
Earth mantle
noon
Ionosphere
dimethylsulfoniopropionate
polarity
mantle
polar regions
ionospheres
alternating current

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Synthesis models of dayside field-aligned currents for strong interplanetary magnetic field by. / Watanabe, Masakazu; Iijima, Takesi; Rich, Frederick J.

In: Journal of Geophysical Research, Vol. 101, No. A6, 96JA00482, 01.01.1996, p. 13,303-13,319.

Research output: Contribution to journalArticle

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