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Modeling of a Prebreakup Arc and Substorm Onset by the “Minimum-B” Model

  • Yu. I. Galperin
Part of the NATO Science Series book series (ASIC, volume 537)

Abstract

High-resolution ground-based optical measurements of pre-breakup arc and substorm onset published by J.Deehr, 1994 are analyzed. They are interpreted as showing the effects of deepening of the magnetic field minimum in the plasma sheet which precedes the substorm onset, in full accord with the concepts of the “Minimum-B” theory and its extension for the substorm onset mechanism. The “Minimum-B” theory, or model is briefly reviewed. It was proposed by Galperin et al., 1992 for the generation of a double-sheet field-aligned current (FAC) Ioop feeding the stable homogeneous prebreakup auroral arc. The theory predicted a minimum in the radial magnetic field profile in the neutral sheet down to ~5 nT or Iower, as a steady double-sheet FAC generator. For a prebreakup arc this generator the “root of the arc” is Iocated at the inner edge (or at an outward gradient) of the cross-tail Iinear current density. In a unique case during a long period of Stationary Magnetospheric Convection on November 24, 1981, the radial magnetic field profile was determined by Sergeev et al., 1996 by two different methods. Both methods consistently showed a deep minimum at the predicted place. Comparisons with simultaneous particle and field measurements from the near-Earth AUREOL-3 sateIIite in the frame of the “Minimum-B” theory (Galperin and Bosqued, 1998) have shown a good quantitative agreement in the FAC Iocation and its double-sheet pattern. An extension of this theory to substorm onset was suggested. It supposed a deepening of the magnetic field minimum till a “critical” Iow value at which some cross-tail current instabilities or other instabilities Iead to a “current disruption”. The ground-based optical measurements mentioned above show several features consistent with the prediction of the magnetic field minimum deepening as a distinct effect during the growth phase just before the substorm.

Keywords

Current Sheet Plasma Sheet Alfven Wave Substorm Onset Neutral Sheet 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Yu. I. Galperin
    • 1
  1. 1.Space Research Institute of Russian Academy of SciencesMoscowRussia

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