Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.490 IF 1.490
  • IF 5-year value: 1.445 IF 5-year
    1.445
  • CiteScore value: 2.9 CiteScore
    2.9
  • SNIP value: 0.789 SNIP 0.789
  • IPP value: 1.48 IPP 1.48
  • SJR value: 0.74 SJR 0.74
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 88 Scimago H
    index 88
  • h5-index value: 21 h5-index 21
Volume 12, issue 2/3
Ann. Geophys., 12, 183–187, 1994
https://doi.org/10.1007/s00585-994-0183-4
© European Geosciences Union 1994
Ann. Geophys., 12, 183–187, 1994
https://doi.org/10.1007/s00585-994-0183-4
© European Geosciences Union 1994

  31 Jan 1994

31 Jan 1994

Role of interchange instability in flux transfer event origin

B. V. Rezhenov and Y. P. Maltsev B. V. Rezhenov and Y. P. Maltsev

Abstract. It is shown that the interaction of the interplanetary magnetic field (IMF), when it has southward component, with the geomagnetic field leads to the formation of an enhanced pressure layer (EPL) near the magnetopause. Currents flowing on the boundary between the EPL and the magnetosheath prevent the IMF from penetrating the magnetosphere. However, the outward boundary of the EPL is unstable. The interchange instability permanently destroys the EPL. Separate filaments of the EPL move away from the Earth. New colder plasma of the magnetosheath with a frozen magnetic field replaces the hotter EPL plasma, and the process of EPL formation and destruction repeats itself.

The instability increment is calculated for various magnitudes of the azimuthal wave number, ky, and curvature radius of the magnetic field lines, Rc. The disturbances with R-1eky≤4R-1e (where Re is the Earth's radius) and RcRe are the most unstable.

A possible result of the interchange instability of the EPL may be patchy reconnection, displayed as flux transfer events (FTEs) near the magnetopause.

Publications Copernicus
Download
XML
Citation