On the altitudinal profile of auroral radar backscatter
Article first published online: 7 DEC 2012
Copyright 1985 by the American Geophysical Union.
Volume 20, Issue 4, pages 735–739, July-August 1985
How to Cite
1985), On the altitudinal profile of auroral radar backscatter, Radio Sci., 20(4), 735–739, doi:10.1029/RS020i004p00735.(
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 13 FEB 1985
- Manuscript Received: 1 NOV 1984
It is assumed that an aspect sensitivity value of 10 dB/deg is a common and inherent property of any auroral backscatter radar. Based on this assumption the altitudinal profiles of auroral backscatter (APB) are calculated. For radar frequencies smaller than about 70 MHz and moderate to high E layer electron densities the APB's have double maxima structures due to the radio wave ionospheric refraction. For frequencies 70–120 MHz, the APB's exhibit only single-maximum profiles. However, even in this case, there remains an altitudinal control of the APB's by the E region electron densities. It is found that there exists strong restriction on the E region altitudes producing auroral radar backscatter for all frequencies. This effect, which is closely related to the height variation of the zero aspect angle surfaces, also causes variations of the APB with range and azimuth.