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THE RELATIONSHIP BETWEEN FIELD-ALIGNED CURRENT AND SUBSTORM PHASE

Jiao Wei-xin.   

  1. Department of Geophysics, Peking University, Beijing 100871
  • Received:1994-12-31 Revised:1900-01-01 Online:1996-04-24 Published:1996-04-24

Abstract: ISEE 1 and 2 measurements of magnetic changes across nightside fieldaligned currents (FACs) in the inner magnetosphere are examined to determine the average ionospheric extrapolated characteristics and properties of regin 1 and 2 currents as a function of substorm phase. The properties of these currents studied include current intensity, density and layer width. It is found that there is a close relation between FACs and substorm phase. Both region 1 and region 2 currents intensity reach their peak during the expansion phase. The average value of intensity in region 1 is about 1.4 times greater in region 2. The current densities in region 1 and 2 behave same with current intensity, i.e from the growth phase to expansion phase, the density increases and from the expansion phase to the recovery phase it decreases.

Key words: Flywheel, Modulation equation, Numerical simulation