Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa33b..01p&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA33B-01
Physics
2437 Ionospheric Dynamics, 2441 Ionospheric Storms (7949), 2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting
Scientific paper
A comparison between results from the Global Ionosphere Thermosphere Model (GITM) and data from Millstone Hill during the September 2005 incoherent scatter world month (ISWM) is presented. One dimensional GITM is used to simulate the ionosphere for the entire month, and comparisons between electron densities, electron temperatures and ion temperatures are performed. It is found that 1D GITM can reproduce the state of the ionosphere to as high as 20% accuracy over the course of the month. The largest errors between the model and observations occur during the geomagnetic storm that begins on September 10th. Therefore, 3D GITM was also used to perform a more realistic simulation of the ionosphere during the storm. The model indicates that enhanced electron densities throughout the 10th are a result of upwelling of molecular rich (N2) air above Millstone Hill, which supports the conclusions made by Goncharenko et. al. (2006). A comparison of the results and the data show that the RMS errors using 3D GITM are not significantly better than the errors using 1D GITM. However, the cross correlation between 3D GITM and the observations, in most cases, is significantly higher than the cross correlation between 1D GITM and the observations. This indicates that the high latitude dynamics associated with the storm propagate to the mid-latitudes. Therefore, the global effects of a storm must be accounted for in order to accurately simulate the ionosphere in the Millstone Hill region.
Pawlowski David J.
Ridley Aaron J.
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