Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa43a..05c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA43A-05
Physics
2407 Auroral Ionosphere (2704), 2481 Topside Ionosphere, 2494 Instruments And Techniques, 2704 Auroral Phenomena (2407), 6929 Ionospheric Physics (1240, 2400)
Scientific paper
The March 1-6, 2007 incoherent scatter radar (ISR) world day experiments coincided with the start of the International Polar Year. The primary objective of the March 1-6 campaign was to examine the distribution of the topside electron density by comparing GPS and high latitude ISR total electron content (TEC) measurements. A detailed comparison between TEC measurements from multiple GPS receivers either collocated or in close proximity to the Poker Flat, Alaska ISR (PFISR) facility will be presented. Similar observations from the Sondrestrom and EISCAT ISRs will also be discussed. Although the geomagnetic conditions during the March 1- 6 time period were primarily quiet (Kp = 1,2), there were a few periods of mild to moderate activity. The quiet time periods were used to determine the background conditions. At the beginning of the geomagnetically disturbed time period, the PFISR TEC observations revealed an increase of 1.5 TEC units approximately an hour after local noon (1:30 UT). This TEC enhancement also corresponded to an increase in the height of the F layer by tens of kilometers. Later that day, at approximately 12 UT, an enhanced E-region electron density distribution was observed for 2-3 hours. During these time periods, elevated TEC measurements were detected by several of the surrounding GPS receivers. Using the network of GPS receivers in Alaska and the directional capability of the PFISR radar, we will analyze the location and size of these enhancements and discuss possible source mechanisms.
Coster Anthea
Heinselman Craig
McCready Mary
Nicolls Michael
Rideout W.
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