The Distant Magnetotail Under Long Duration, Very Northward IMF Conditions: October 22-24, 2003

Details The Distant Magnetotail Under Long Duration, Very Northward IMF Conditions: October 22-24, 2003 The Distant Magnetotail Under Long Duration, Very Northward IMF Conditions: October 22-24, 2003

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm22a..03f&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM22A-03

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet

Scientific paper

A unique 32 hour interval of very northward Interplanetary Magnetic Field (IMF) on October 22-24, 2003 created a exceptionally thick cold dense magnetotail plasma sheet, a small polar cap and accompanying small tail lobe. These features were detected by the Cluster DMSP and FAST spacecraft and modeled by a global simulation as describe in recent papers by Oieroset et al. (2005) and Li et al. (2005). During the same interval the Wind spacecraft was passing through the center of the magnetotail about 130 Re downstream of Earth. Wind results that will be described reveal a very unusual magnetotail characterized by (1) continual tailward flow of 200-400 km/s with densities in the range 0.2-3/cc, both of which are clearly less than expected in the magnetosheath, (2) velocity waves of 100 to 200 km/s peak-to-peak amplitude and periods of 10 to 20 minutes superposed on the downstream flow, and (3) a mostly northward Bz magnetic field component with an often larger-magnitude Bx component whose sign reversal indicates crossings between the two hemispheres of the tail. The results appear to be consistent with the reported simulation that showed high latitude cusp reconnection and subsequent downtail flow of closed field lines, but the waves may be consistent with the Kelvin-Helmholtz instability often thought to occur during northward IMF conditions. Oieroset, M., J. Raeder,T. D. Phan, S. Wing, J. P. McFadden, W. Li, M. Fujimoto, H. Re`me, and A. Balogh (2005), Geophys. Res. Lett., 32, L12S07, doi:10.1029/2004GL021523. Li, W., J. Raeder, J. Dorelli, M. Oieroset, and T. D. Phan (2005), Geophys. Res. Lett., 32, L12S08, doi:10.1029/2004GL021524.

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