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Title: F region ionosphere effects on the mapping accuracy of SuperDARN HF radar echoes
Authors: Chen, X.-C.
Lorentzen, D. A.
Moen, J. I.
Oksavik, K.
Baddeley, L. J.
Lester, Mark
First Published: 19-May-2016
Publisher: American Geophysical Union (AGU)
Citation: Radio Science, 2016, 51 (5), pp. 490-506
Abstract: 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.
DOI Link: 10.1002/2016RS005957
ISSN: 0048-6604
eISSN: 1944-799X
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © American Geophysical Union (AGU), 2016. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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