Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..24c&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 24-1, CiteID 1386, DOI 10.1029/2001GL014087
Physics
15
Ionosphere: Polar Cap Ionosphere, Ionosphere: Plasma Convection, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Ionosphere: Ionosphere/Magnetosphere Interactions (2736)
Scientific paper
We present the first ever measurement of the full thermal plasma properties, of an ionospheric patch in full darkness in the noon region where patches are believed to form. Further these data present the first experimental evidence for the Lockwood and Carlson class of mechanisms for forming patches by plasma injection. These data were possible only because of a new measurement capability we had to develop. We introduce the capability here because it crosses the high-speed threshold that now allows study of a broader class of mesoscale plasma flow-transients, which are thought to occur over time scales near 2 minutes vice 8-10 minutes. Cumulatively such transients may significantly drive global convection. We demonstrate both the validity of and need for our new measurement capability, by presenting a transient flow reversal sweeping across a 500 by 1000 km area, with initial reversal in 4 minutes, and recovery within 6 minutes.
Carlson Herbert C.
Guio Pactrick
Moen Joran
Oksavik Kjellmar
van Eyken Anthony P.
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