New Interest Blooms in the Mid-latitude Ionosphere

Details New Interest Blooms in the Mid-latitude Ionosphere New Interest Blooms in the Mid-latitude Ionosphere

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41c..03k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41C-03

Other

2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting, 2471 Plasma Waves And Instabilities

Scientific paper

With the advent of CCD imagers and lidars the mid-latitude ionosphere has suddenly become interesting again. In the F-region images at 6300, 5577 and 7774 angstroms has revealed mesoscale structures filling the night sky and moving in a southwestward direction. These have some of the properties of the theory proposed by Perkins in 1973 but move in exactly the wrong direction. Simultaneous radar and airglow data though have shown that their nonlinear behavior is quite different than linear theory suggests. Thus we are in the next phase of understanding this process similar to the condition in Equatorial Spread F in 1975. As then we need good simulations which must necessarily be in 3-dimensions. Another surprise is that attempts to validate assimilative models have shown some perplexing issues to be resolved. Modest magnetic activity seems to push the Appleton Anomaly to Arecibo's latitude with large TEC's and steep latitudinal gradients. Observation of 300 TEC units over Florida is also difficult to understand. In the E-region new emphasis on neutral atmospheric instabilities has begun. The rocket TMA releases show huge winds all the time, winds which are Richardson Number unstable. Clear correlations between lidar and radar disturbances seem to verify this and new theoretical work on neutral wind driven instabilities also are relevant. In the D-region dust detectors have finally been invented and flown on rockets. Heterogeneous chemistry seems to be occurring in one data set. Mid-latitudes are alive and well and should provide some great science in the coming decade.

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