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Title: | Shear flow instabilities in the earth's magnetotail |
Authors: | Reddy, R.V. Lakhina, G.S. |
Keywords: | Magnetosphere Magnetotail Plasma sheet Inner ventral plasma sheet Outer central plasma sheet |
Issue Date: | 1996 |
Citation: | Ann. Geophysicae, v.14, p.786-793, 1996. |
Abstract: | Shear flow instability is studied in the Earth’s magnetotail by treating plasma as compressible. A dispersion relation is derived from the linearized MHD equations using the oscillating boundary conditions at the inner central plasma sheet/outer central plasma sheet (OCPS) interface and OCPS/plasma-sheet boundary layer (PSBL) interface, whereas the surface-mode boundary condition is used at the PSBL/lobe interface. The growth rates and the real frequencies are obtained numerically for near-Earth (\midX\mid\sim10-15 R E ) and far-Earth (\midX\mid\sim100 R E ) magnetotail parameters. The periods and wavelengths of excited modes depend sensitively on the value of plasma-sheet half thickness, L, which is taken as L=5 R E for quiet time and L=1 R E for disturbed time. The plasma-sheet region is found to be stable for constant plasma flows unless M A3 >1.25, where M A3 is the Alfvén Mach number in PSBL. For near-Earth magnetotail, the excited oscillations have periods of 2–20 min (quiet time) and 0.5-4 min (disturbed time) with typical transverse wavelengths of 2–30 R E and 0.5-6.5 R E , respectively; whereas for distant magnetotail, the analysis predicts the oscillation periods of \sim8-80 min for quiet periods and 2–16 min for disturbed periods. |
URI: | http://localhost:8080/xmlui/handle/123456789/38 |
Appears in Collections: | UAS_Reprints |
Files in This Item:
File | Description | Size | Format | |
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ReddyRV_LakhinaGS_AnneGeophys_1996.pdf | 2.41 MB | Adobe PDF | View/Open |
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