Evidence for Depletion Layers at the Dayside Magnetopause for IMF Orientations with Southward Components

Details Evidence for Depletion Layers at the Dayside Magnetopause for IMF Orientations with Southward Components Evidence for Depletion Layers at the Dayside Magnetopause for IMF Orientations with Southward Components

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32c..05m&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM32C-05

Physics

2724 Magnetopause, Cusp, And Boundary Layers, 2728 Magnetosheath, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The equatorward precession of Polar's apogee allowed the satellite to execute prolonged south-to-north skimming orbits along the dayside magnetopause during the equinoctial months of 2000 and 2001. Particle and field measurements during these skimming passes give new perspectives of the magnetopause and adjacent magnetosheath. Correlations between magnetic field variations observed at an upstream monitor and in the magnetosheath were established, considering variable lag times due to tilted phase fronts in the solar wind. Combining these results with MHD simulation results using the MRC Integrated Space Weather Model, we predict and observe depletion layers for two categories of events with southward IMF components, in addition to those normally observed with northward IMF. Depletion was seen at the velocity separator connecting the two high-latitude merging sites in each hemisphere. Flux piles up in this stagnation region until the field lines drape to the high-latitude merging site. This is enhanced by the presence of dipole tilt or a BX component. In addition the simulations show that the high-altitude cusps move toward the equator and shoulders develop in the open magnetic field configuration above the cusp for strongly driven conditions. The shoulder will be strongest in the hemisphere tilted toward the Sun. The shoulder slows the flux approaching the magnetopause, and the resulting pile up creates a depletion layer above the cusp during active events with large southward IMF. Observations from the March 31, 2001 storm are consistent with the existence of these shoulder depletion layers.

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