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Parhi et al. 1999
Parhi, S., Suess, S.T. and Sulkanen, M. (1999). Can Kelvin-Helmholtz instabilities of jet-like structures and plumes cause solar wind fluctuations at 1 AU?. Journal of Geophysical Research 104: doi: 10.1029/1999JA900041. issn: 0148-0227.

The long high-latitude sampling of Ulysses provides the opportunity to study fine structures. At latitudes poleward of ~-60¿ the solar wind had fluctuations in velocity gradients which were attributed to microstreams. The data also suggested fluctuations characterized by magnetic plus thermal pressure balance structures ('PBS'). At higher frequencies, MHD turbulence was observed and found to be less evolved than it is in the ecliptic but essentially independent of heliographic latitude. It is argued here that microstreams, PBS, and MHD turbulence could all be the remnants of mixing due to shear instabilities associated with plumes and other filamentary structures (jets) in coronal holes. To show this, we simulate a plume-like jet in the presence of an ambient magnetic field. We find that the presence of the ambient field reduces the growth rate of the instability, but the shear between a jet and its ambient still becomes unstable to the MHD Kelvin-Helmholtz instability when the shear speed is larger than the largest local magnetosonic speed, a condition probably satisfied for plumes. ¿ 1999 American Geophysical Union

BACKGROUND DATA FILES

Abstract

Keywords
Solar Physics, Astrophysics, and Astronomy, Coronal holes, Space Plasma Physics, Numerical simulation studies, Solar Physics, Astrophysics, and Astronomy, Corona, Atmospheric Composition and Structure, Middle atmosphere—energy deposition, Interplanetary Physics, Planetary bow shocks
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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