Spatial Correlations of Day-to-Day Ionospheric Total Electron Content Variability Obtained from Ground-Based GPS

Details Spatial Correlations of Day-to-Day Ionospheric Total Electron Content Variability Obtained from Ground-Based GPS Spatial Correlations of Day-to-Day Ionospheric Total Electron Content Variability Obtained from Ground-Based GPS

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa53b1373s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA53B-1373

Physics

2400 Ionosphere (6929), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2443 Midlatitude Ionosphere

Scientific paper

We have studied the spatial correlations of day-to-day ionospheric total electron content (TEC) variations over a period of 4 months in 2004 (day 001-029, 080-110, 172-202, and 266-296) using more than 1000 ground- based GPS receivers. The spatial correlations were obtained in a 2-step process. Initially, the day-to-day variability was calculated by first mapping the observed slant TEC values for each 5-minute GPS ground receivers-satellite pair to the vertical using a simple geometrical factor and then differencing it with its corresponding value from the previous day. This resulted in more than 150 million differential vertical TEC (DVTEC) values. Next, statistic was performed on the differential vertical TEC values to obtain their spatial correlations. Our study indicates strong correlations between geomagnetic conjugate points and these correlations are larger at low latitudes (0.62-0.73) than at mid-latitudes (0.31-0.43). Typical correlation lengths, defined as the length at which the correlation coefficient drops to 0.7, were found to be larger at mid-latitudes than at low latitudes. The meridian correlation lengths are about 10 degrees and 5 degrees at middle and low latitudes, respectively. The zonal correlation lengths are approximately 20 degrees at mid-latitudes and 10 degrees at low latitudes. The correlation lengths are larger during daytime (1100-1300LT) than during nighttime (2300-0100LT). Our results indicate that the spatial correlation is largely independent of season. The local time and latitude dependence of the spatial correlation coefficients will be discussed.

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