Comparison Between GAIM and LLIONS in the Jicamarca Low Latitude Sector During the First CAWSES Space Weather Campaign

Details Comparison Between GAIM and LLIONS in the Jicamarca Low Latitude Sector During the First CAWSES Space Weather Campaign Comparison Between GAIM and LLIONS in the Jicamarca Low Latitude Sector During the First CAWSES Space Weather Campaign

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa33a1142a&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA33A-1142

Physics

2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2447 Modeling And Forecasting

Scientific paper

The Utah State University (USU) Global Assimilation of Ionospheric Measurements (GAIM) Model has been compared to the Space Environment Corporation (SEC) Low Latitude IONospheric Sector (LLIONS) model for the period 20 March 2004 through 14 April 2004. This period includes the first CAWSES space weather period. The objective of this comparison is to assess how the data assimilation in the GAIM Kalman filter is able to reorganize the low-latitude ionospheric morphology, specifically the locations and intensities of the Equatorial Anomaly peaks. The LLIONS approach uses observations in the Jicamarca sector to modify the electric field driver, which is the dominant transport mechanism for the equatorial ionosphere. In this study, the observations from magnetometers and digisondes are only able to modify the vertical ExB drift velocities during sunlit conditions. Hence, the primary comparisons are for daytime low latitudes along the Jicamarca longitude sector. At night, only the GAIM assimilation reveals the marked structuring of the equatorial ionosphere. Results are presented contrasting a range of geomagnetic quiet-to-disturbed conditions. These comparisons include not only TEC, but also F-region electron density profiles as a function of latitude and local time.

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