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A classification of spectral populations observed in HF radar backscatter from the E region auroral electrojets

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journal contribution
posted on 01.02.2016, 11:25 by Stephen Eric Milan, M. Lester
Observations of HF radar backscatter from the auroral electrojet E region indicate the presence of five major spectral populations, as opposed to the two predominant spectral populations, types I and II, observed in the VHF regime. The Doppler shift, spectral width, backscatter power, and flow angle dependencies of these five populations are investigated and described. Two of these populations are identified with type I and type II spectral classes, and hence, are thought to be generated by the two-stream and gradient drift instabilities, respectively. The remaining three populations occur over a range of velocities which can greatly exceed the ion acoustic speed, the usual limiting velocity in VHF radar observations of the E region. The generation of these spectral populations is discussed in terms of electron density gradients in the electrojet region and recent non-linear theories of E region irregularity generation.

History

Citation

Annales Geophysicae, 2001, 19 (2), pp. 189-204 (16)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Annales Geophysicae

Publisher

European Geophysical Society

issn

0992-7689

eissn

1432-0576

Copyright date

2001

Available date

01/02/2016

Publisher version

http://www.ann-geophys.net/19/189/2001/

Language

en