2003
DOI: 10.1029/2003gl017981
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Firehose instability near substorm expansion‐phase onset?

Abstract: [1] The evolution of plasma ejected earthward from a patch of reconnection at $25 R E is studied using a double-adiabatic-MHD simulation of a thin filament. Firehose instability occurs in the simulation after a compressional shock reflects from the near-Earth region. The tailward-propagating compressional wave, which brakes the earthward flow in the filament, is characterized by strong magnetic fluctuations. Within the context of the Near-Earth-X-Line model of substorms, we suggest that firehose instability mi… Show more

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Cited by 3 publications
(6 citation statements)
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“…[20] In a related work Ji and Wolf [2003b] argue that the appearance of the anisotropy is a product of the near-Earth neutral line formation. Consequently, the observations of Pi-2 turbulence described here along the auroral field lines may be a signature of the flow braking from fast Earthward flows produced by a near-Earth neutral line.…”
Section: Discussionmentioning
confidence: 99%
“…[20] In a related work Ji and Wolf [2003b] argue that the appearance of the anisotropy is a product of the near-Earth neutral line formation. Consequently, the observations of Pi-2 turbulence described here along the auroral field lines may be a signature of the flow braking from fast Earthward flows produced by a near-Earth neutral line.…”
Section: Discussionmentioning
confidence: 99%
“…The firehose instability driven by p ∥ > p ⊥ pressure anisotropy is typically created by the Fermi acceleration mechanism due to rapid shortening of the flux tube length by convection or by bursty bulk flows. Bursty bulk flows increase the parallel pressure faster than the perpendicular pressure in the high‐β central plasma sheet driving the firehose instability [ Ji and Wolf , 2003a, 2003b]. A sufficiently large dawn‐to‐dusk electric field would also be expected to trigger the firehose instability and produce turbulent magnetic fluctuations by the conversion of anisotropy particle energy stored in the plasma pressures in the high‐β regions of the plasma sheet.…”
Section: Discussionmentioning
confidence: 99%
“… Ji and Wolf [2003a, 2003b] established that the firehose mechanism is set off during the rapid Earthward convection associated with bursty bulk flows. Other studies have suggested how the Pi2 pulsations and flow braking are related [ Shiokawa et al , 1998; Kepko and Kivelson , 1999, 2001].…”
Section: Discussionmentioning
confidence: 99%
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