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 33, issue 8
Ann. Geophys., 33, 965–982, 2015
https://doi.org/10.5194/angeo-33-965-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Dynamic processes in geospace

Ann. Geophys., 33, 965–982, 2015
https://doi.org/10.5194/angeo-33-965-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 07 Aug 2015

Regular paper | 07 Aug 2015

Statistical analysis of storm-time near-Earth current systems

M. W. Liemohn1, R. M. Katus1,2, and R. Ilie1 M. W. Liemohn et al.
  • 1Atmospheric, Oceanic, and Space Sciences Department, University of Michigan, Ann Arbor, MI USA
  • 2Department of Physics and Astronomy, West Virginia University, Morgantown, WV USA

Abstract. Currents from the Hot Electron and Ion Drift Integrator (HEIDI) inner magnetospheric model results for all of the 90 intense storms (disturbance storm-time (Dst) minimum < −100 nT) from solar cycle 23 (1996–2005) are calculated, presented, and analyzed. We have categorized these currents into the various systems that exist in near-Earth space, specifically the eastward and westward symmetric ring current, the partial ring current, the banana current, and the tail current. The current results from each run set are combined by a normalized superposed epoch analysis technique that scales the timeline of each phase of each storm before summing the results. It is found that there is a systematic ordering to the current systems, with the asymmetric current systems peaking during storm main phase (tail current rising first, then the banana current, followed by the partial ring current) and the symmetric current systems peaking during the early recovery phase (westward and eastward symmetric ring current having simultaneous maxima). The median and mean peak amplitudes for the current systems ranged from 1 to 3 MA, depending on the setup configuration used in HEIDI, except for the eastward symmetric ring current, for which the mean never exceeded 0.3 MA for any HEIDI setup. The self-consistent electric field description in HEIDI yielded larger tail and banana currents than the Volland–Stern electric field, while the partial and symmetric ring currents had similar peak values between the two applied electric field models.

Please read the corrigendum first before accessing the article.
Publications Copernicus
Download
Notice on corrigendum

The requested paper has a corresponding corrigendum published. Please read the corrigendum first before downloading the article.

Short summary
The different electric current systems flowing in the near-Earth nightside magnetosphere each have a unique contribution to the magnetic and electric field distortion of geospace. This study quantifies the intensity and timing of five current systems as calculated from 90 storm events using an inner magnetospheric drift physics model. There is a systematic progression through the various current systems, leading to implications for nonlinear feedback on the geospace system.
The different electric current systems flowing in the near-Earth nightside magnetosphere each...
Citation