Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0471n&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0471
Physics
2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2447 Modeling And Forecasting
Scientific paper
A good assumption in most cases, and one that is used often as a boundary condition, is that there is very little shear in the neutral wind in the thermosphere. However, we have noticed that in cases of strong density perturbations, such as a sudden rise in the height of the F peak, there are often strong shears in the neutral wind as ion drag drives the wind, overpowering viscocity. On April 17, 2002, during an intense geomagnetic storm, there was strong electron density depletion over the Arecibo Observatory accompanied by a significant shear in the neutral wind. Neutral winds over Arecibo are calculated using the standard Burnside method, and we compare the results to FPI measured winds to ensure that we reproduce the correct trend. We compare the predicted neutral wind from TIMEGCM to the calculated wind over Arecibo, and note that TIMEGCM does not predict this shear. We present a local model based on first principles to attempt to recreate this shear. We also compare the forcing terms from TIMEGCM, our local model, and the actual data.
Kelley Michael C.
Makela Jarmo
Nicolls Michael J.
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