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F region ionosphere effects on the mapping accuracy of SuperDARN HF radar echoes

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journal contribution
posted on 2016-08-17, 15:18 authored by X.-C. Chen, D. A. Lorentzen, J. I. Moen, K. Oksavik, L. J. Baddeley, Mark Lester
Structured particle precipitation in the cusp is an important source for the generation of F region ionospheric irregularities. The equatorward boundaries of broad Doppler spectral width in Super Dual Auroral Radar Network (SuperDARN) data and the concurrent OI 630.0 nm auroral emission are good empirical proxies for the dayside open-closed field line boundary. However, SuperDARN currently employs a simple virtual model to determine the location of its echoes, instead of a direct calculation of the radio wave path. The varying ionospheric conditions could influence the final mapping accuracy of SuperDARN echoes. A statistical comparison of the offsets between the SuperDARN Finland radar spectral width boundary (SWB) and the OI 630.0 nm auroral emission boundary (AEB) from a meridian-scanning photometer (MSP) on Svalbard is performed in this paper. By restricting the location of the 630.0 nm data to be near local zenith where the MSP has the highest spatial resolution, the optical mapping errors were significantly reduced. The variation of the SWB-AEB offset confirms that there is a close relationship between the mapping accuracy of the HF radar echoes and solar activity. The asymmetric variation of the SWB-AEB offset versus magnetic local time suggests that the intake of high-density solar extreme ultraviolet ionized plasma from postnoon at subauroral latitudes could result in a stronger refraction of the HF radar signals in the noon sector, while changing the HF radar operating frequency also has a refraction effect that contributes to the final location of the HF radar echoes.

History

Citation

Radio Science, 2016, 51 (5), pp. 490-506

Author affiliation

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

Version

VoR (Version of Record)

Published in

Radio Science

Publisher

American Geophysical Union (AGU)

issn

0048-6604

eissn

1944-799X

Acceptance date

2016-04-28

Copyright date

2016

Available date

2016-11-19

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2016RS005957/abstract

Language

en