Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....8145w&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #8145
Physics
Scientific paper
A pair of GPS scintillation monitors have been operating in Asmara at 15.4 N, 39.9 W {geographic} since September 2001, placed there because of earlier observations with an all-sky imager indicating the frequent appearance of plasma depletion plumes. The data presented are a preliminary count of occurrence frequency of scintillation, generally associated with equatorial spread-F (ESF) conditions, diurnally and seasonally. The monitors have a playback facility to evaluate the previous nights scintillation activity These displays consist of azimuth-elevation plots of GPS satellite location surrounded by circles of diameter proportional to the standard deviation of the average power received second by second. These time-varying plots were visually evaluated by an hourly index of 2 to indicate clear and strong occurrence, 1 to indicate doubtful or weak occurrence, and 0 to indicate no occurrence Averages of these hourly indices over two-week intervals gave occurrence frequencies that were then plotted as contours on a grid of local time versus semi-month. The contour plot shows maximum occurrence frequency of the GPS scintillations during the evening hours and around the equinoxes, as expected, but it also shows more scintillation on the summer side of the equinoxes than on the winter side, and more interseasonal scintillation than may have been expected. Separating the data according to the planetary geomagnetic index Kp suggests that there may be at least two phenomena responsible for the scintillations, ESF, being the more common one.
Kintner Paul M.
Mussie A.
Wiens Rudolph H.
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