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Ann. Geophys., 24, 1333-1342, 2006
www.ann-geophys.net/24/1333/2006/
© European Geosciences Union 2006
F-region electron density and Te / Ti measurements using incoherent scatter power data collected at ALTAIR
M. Milla and E. Kudeki
Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Illinois, USA
Abstract. The ALTAIR UHF radar was used in an incoherent scatter experiment to observe
the low-latitude ionosphere during the Equis 2 rocket campaign. The
measurements provided the first high-resolution electron density maps of the
low-latitude D- and E-region in the Pacific sector and also
extended into the F-region and topside ionosphere. Although the
sampling frequency was well below the Nyquist frequency of F-region
returns, we were able to estimate Te / Ti ratio and infer unbiased electron
density estimates using a regularized inversion technique described here. The
technique exploits magnetic aspect angle dependence of ISR cross-section for
Te>Ti.
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