Physics – Plasma Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3901107l&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 1, CiteID L01107
Physics
Plasma Physics
Ionosphere: Auroral Ionosphere (2704), Ionosphere: Particle Acceleration, Ionosphere: Plasma Waves And Instabilities (2772), Ionosphere: Topside Ionosphere, Space Plasma Physics: Wave/Particle Interactions (2483, 6984)
Scientific paper
Using a multi-payload sounding rocket mission, we present the first direct measurement of velocity shear in the topside auroral ionosphere. In regions of large, ˜200 mV/m, transient electric fields we directly measure differences in the plasma drift velocity. From these differences, shear frequencies reaching ±6Hz are measured. These directly measured shears are compared with the shear inferred from single payload measurements. It is shown this traditional measurement of shear overestimates the shear frequency by a factor of two for this event, highlighting the importance of the temporal component of near-DC electric field structures. Coincident with these strong fields and shears are enhanced emissions of broadband, extremely low frequency (BB-ELF) plasma waves, and a narrowband wave emission near the H+-O+ bi-ion resonant frequency.
Kintner Paul M.
Lundberg E. T.
Lynch Kristina Anne
Mella M. R.
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