Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33b1644c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA33B-1644
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection (2760), 2481 Topside Ionosphere, 2494 Instruments And Techniques, 2704 Auroral Phenomena (2407)
Scientific paper
Since the early 1990's, comparisons of the measured total electron content (TEC) have been made between GPS and incoherent scatter radar (ISR). This was first done in 1990 using data collected at the Millstone Hill ISR site in Westford, MA. The Millstone Hill ISR can measure electron density up to approximately 800 km, depending on the amount of signal integration and/or the total amount background ionization. The initial ISR and GPS TEC comparisons were somewhat surprising in that the differences between these measurements varied significantly depending on the geomagnetic conditions. Prior to a geomagnetic storm, there were indications that as much as 20 percent of the background TEC was observed to be above 800 km. Directly after the geomagnetic storm, the average difference between the ISR and GPS TEC measurements was almost zero. This has been recently explained by the IMAGE satellite observations of the plasmaspheric drainage plumes which effectively drain plasma from the plasmasphere out into space during geomagnetically active conditions. Here, we will report on comparisons of the GPS and ISR estimates of the TEC in the high latitudes from the first year of the IPY, March 1, 2007 through March 1, 2008. Our analysis will focus on data from the ISRs associated with the high latitudes: the Poker Flat radar in Alaska, the EISCAT radar in Svalbard, the Sondrestrom radar in Greenland, and the Millstone Hill radar in Massachusetts. During this time period, the Poker Flat (PFISR) and EISCAT Svalbard (ESR) radars ran continuously. The Millstone Hill and Sondrestrom ISRs ran bi-weekly throughout the year. These comparisons will utilize TEC data from the Madrigal database that was estimated from the global network of GPS receivers. In addition, TEC data collected from individual GPS receivers located near the ISRs will be examined. The GPS versus ISR TEC comparisons will be used to study the variation of the high altitude electron content as a function of latitude, geomagnetic conditions, and season.
Coster Anthea J.
Rideout W. E.
Zhang Sheng
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