Hysteresis in solar wind power input to the magnetosphere

Minna Palmroth*, Pekka Janhunen, Tuija I. Pulkkinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We examine the clock angle dependence of the solar wind power input into the magnetosphere using the Grand Unified Magnetosphere Ionosphere Coupling Simulation (GUMICS-4). We compute the power input through the magnetopause systematically in four events where the solar wind parameters are otherwise kept constant, but the interplanetary magnetic field ( IMF) clock angle theta is rotated from 0 degrees to 360 degrees. We find that when the clock angle rotates from north to south, the power input is well represented by sin(2)(theta/2). However, during the return rotation from south to north, the power input in the simulation remains enhanced longer than a sin(2)(theta/2) dependence would indicate. We suggest that the enhanced energy input during the return rotation may be a consequence of the nature of the reconnection process at the magnetopause.

Original languageEnglish
Article number03107
Number of pages4
JournalGeophysical Research Letters
Volume33
Issue number3
DOIs
Publication statusPublished - 14 Feb 2006
MoE publication typeA1 Journal article-refereed

Keywords

  • GLOBAL MHD SIMULATION
  • MAGNETIC-FIELD
  • ENERGY INPUT
  • MODEL
  • RECONNECTION
  • MAGNETOPAUSE

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