Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa44a..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA44A-02
Other
[2407] Ionosphere / Auroral Ionosphere, [2439] Ionosphere / Ionospheric Irregularities, [2441] Ionosphere / Ionospheric Storms, [2475] Ionosphere / Polar Cap Ionosphere
Scientific paper
While GPS phase scintillations have been observed at high latitudes (primarily in the Northern Hemisphere) for several years, there remains ambiguity as to what degree the observations are due to F region irregularities formed from gradient-drift instabilities and related processes, versus E and F region structuring due to particle precipitation. One possible way to determine between the two processes is to correlate GPS scintillation observations with observations of auroral structuring from All Sky Imagers (ASI). Unfortunately, there have only been two unambiguous events where there are clear correlations between GPS scintillations and auroral structuring in the literature. In January 2010, an agreement was made between NSF, the British Antarctic Survey, and the University of Bath, UK to allow the installation of a Bath GPS scintillation receiver at South Pole Station. In December 2010, the first of three GPS scintillation receivers to be installed remotely at AGO stations was installed at the AGO station located at P3 (82.755 S, 28.577 E). Both South Pole and P3 have All Sky Imagers (ASI) co-located with the GPS scintillation receivers. Thus, for the first time we have the ability to conduct long term studies correlating GPS scintillations with observations from ASIs. This paper reports on a case study event from May 20, 2010. On that date the ASI located at South Pole observed significant auroral structuring over most of the day. Simultaneously, the GPS receiver at South Pole observed significant amounts of phase scintillations over several hours. Analysis of the observations over the day focuses on whether or not the ASI observations and GPS scintillation observations are correlated in space and time. If there is a strong correlation, then the interesting research question is are the scintillation observations primarily due to temporal variations of auroral precipitation, or spatially structuring of auroral forms that are moving across the GPS field of view with constant drift velocity? Results will be presented on the correlations between ASI observations of auroral structures and GPS scintillations for the May 20 event, and as to what are the physical causes of the observed GPS scintillations. In addition, if time permits, initial results from analysis of several other similar events on other days will be presented for both South Pole and the AGO site P3.
Bust Gary S.
Kinrade John
Mitchell Charles
Murr David
Weatherwax Allan T.
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