Hysteresis in solar wind power input to the magnetosphere

Tutkimustuotos: Lehtiartikkelivertaisarvioitu



  • Finnish Meteorological Institute
  • University of Helsinki
  • Los Alamos Natl Lab, Los Alamos National Laboratory, United States Department of Energy (DOE)


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.


JulkaisuGeophysical Research Letters
TilaJulkaistu - 14 helmikuuta 2006
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 2606075