Oscillatory braking of BBFs and associated ionospheric response (Invited)

Details Oscillatory braking of BBFs and associated ionospheric response (Invited) Oscillatory braking of BBFs and associated ionospheric response (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm52a..01p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM52A-01

Physics

[2407] Ionosphere / Auroral Ionosphere, [2409] Ionosphere / Current Systems, [2764] Magnetospheric Physics / Plasma Sheet, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

Chen and Wolf [1999] used a thin-filament theory to construct a 2D model of a bursty bulk flow (BBF) motion inside the plasma sheet. The modeling revealed that the low-entropy filament overshoots its equilibrium position and executes a heavily damped oscillation about that position. In this presentation we demonstrate the multiple overshoot and rebound of a BBF observed by the five THEMIS probes on 17 March 2008 just after 10:22 UT. We show that the BBF oscillatory braking was accompanied by interlaced enhancements and depletions of radial pressure gradients. The earthward and tailward flow bursts formed vortices with opposite sense of rotation. Additionally, we study the ionosphere response to the oscillatory braking. We traced the plasma sheet double-vortex system down to earth using the equivalent ionospheric current patterns, which were produced with the help of the ground-based THEMIS magnetometer array. The upward and downward field-aligned currents corresponding to the two vortices were modulated by the oscillatory flow motion in the plasma sheet. This modulation appeared to be the root of the observed Pi2 pulsations. The all-sky imager observations at Fort Yukon showed the auroral streamers that extended southward during the earthward flow bursts, and retreated northward during the tailward rebounds. The streamers became hook-shaped when the flow bursts stopped. Chen, C. X., and R. A. Wolf (1999), Theory of thin-filament motion in Earth’s magnetotail and its application to bursty bulk flows, J. Geophys. Res., 104, 14,613-14,626, doi:10.1029/1999JA900005.

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