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Structure and detection of Kelvin-Helmholtz vortices in the ... - GPSM

Structure and detection of Kelvin-Helmholtz vortices in the ... - GPSM

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Introduction<br />

Observations show:<br />

The magnetopause boundary layer gets THICK at low latitudes,<br />

<strong>and</strong> <strong>the</strong> plasma sheet becomes COLD <strong>and</strong> DENSE, dur<strong>in</strong>g<br />

Northward <strong>in</strong>terplanetary magnetic field (IMF) periods.<br />

(e.g., Mitchell et al., 1987; Terasawa et al., 1997)<br />

These facts suggest significant transport <strong>of</strong> solar w<strong>in</strong>d<br />

plasmas <strong>in</strong>to <strong>the</strong> magnetosphere under northward IMF<br />

conditions.<br />

What is <strong>the</strong> transport mechanism<br />

□ Magnetic reconnection (e.g., Song & Russell, 1992)<br />

□ Transport through <strong>Kelv<strong>in</strong></strong>-<strong>Helmholtz</strong> <strong>in</strong>stability (KHI)<br />

(e.g., Fujimoto & Terasawa, 1994)<br />

□ Diffusion via wave-particle <strong>in</strong>teractions, such as via K<strong>in</strong>etic<br />

Alfven waves (e.g., Johnson & Cheng, 1997)

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