Kelvin-Helmholtz Waves on the Dusk Flank Boundary Layer During Very Northward IMF Conditions: Observations and Simulations

Details Kelvin-Helmholtz Waves on the Dusk Flank Boundary Layer During Very Northward IMF Conditions: Observations and Simulations Kelvin-Helmholtz Waves on the Dusk Flank Boundary Layer During Very Northward IMF Conditions: Observations and Simulations

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm22a..01f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM22A-01

Physics

2724 Magnetopause And Boundary Layers, 2748 Magnetotail Boundary Layers, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2780 Solar Wind Interactions With Unmagnetized Bodies

Scientific paper

The Geotail spacecraft made an inbound passage perpendicular to the dusk magnetopause on August 1, 1998 when the interplanetary magnetic field had been very northward for more than 10 hours. As the spacecraft approached the magnetopause, boundary waves led to transitions between the magnetosheath and a fluctuating boundary region with magnetosheath-like densities and tailward velocities. The boundary waves are thought to be Kelvin Helmholtz waves and they had wave periods that gradually increased from 3 minutes in the outer boundary layer to 6 minutes at a location ~1 Re further in and 1 hour later. Velocity vectors initially rotated clockwise (looking down from the north) in the region where the magnetopause was being crossed before changing to counterclockwise at later times. Rapid magnetic field fluctuations with variations of 50 nT/s may be caused by twisting of the field by vortices. Such vortices could be important in transporting plasma to the magnetosheath where densities of 5/cc were observed. A global simulation of the event with the BATS_R_US code showed evidence of waves on the dusk boundary with wavelengths of ~10 Re and down tail phase velocities of ~150 km/s, a velocity that is comparable to the local flow velocity.

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