Temporal and Spatial Variability Studies Using two High Latitude Tomography Arrays

Details Temporal and Spatial Variability Studies Using two High Latitude Tomography Arrays Temporal and Spatial Variability Studies Using two High Latitude Tomography Arrays

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31a13b&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31A-13

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2407 Auroral Ionosphere (2704), 6982 Tomography And Imaging

Scientific paper

This paper will present recent results from data collected from two high latitude tomographic arrays. One array consists of four receivers and is located on the Western coast of Greenland. This array is operated by Applied Research Laboratories, the University of Texas at Austin (ARL:UT) in collaboration with the Danish Meteorological Institute and SRI International. The other array is located in Alaska and consists of six receivers along approximately a 145 W. longitude meridian. Three of the receivers are operated by University of Alaska Fairbanks Geophysical Institute in collaboration with ARL:UT. The other three receivers are operated by Northwest Research Associates Inc. We will present tomographic reconstructions of electron density from both arrays. The tomographic results allows investigation of variability on time scales of approximately 30 minutes and longer. In addition, by comparing tomographic inversions from the two arrays we can investigate the longitudinal dependence of variability. Further, the effects of variability in latitude and altitude can be studied, since tomography provides an estimate of electron density over a large latitude and altitude range. In addition, variability can be investigated by studying TEC measurements from individual receivers within the Greenland and Alaska arrays. At high latitudes there are often multiple satellites being tracked simulteneously and the TEC data from multiple satellites allow investigation of both spatial and temporal variability. The coherent ionospheric doppler receivers (CIDR) developed at ARL:UT are capable of tracking up to three satellites simulteneously. The Greenland array entirely consists of CIDR receivers, while two of the receivers in Alaska are CIDR receivers. We will present results from studying such ``multiple satellite'' events, and discuss to what degree the observed differences in TEC are due to temporal variability, spatial variability, or both.

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