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| Titel |
F-region ionosphere effects on the mapping accuracy of SuperDARN HF radar
echoes |
| VerfasserIn |
Xiangcai Chen, Dag Lorentzen, Jøran Moen, Kjellmar Oksavik, Lisa Baddeley, Mark Lester |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250129409
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| Publikation (Nr.) |
 EGU/EGU2016-9518.pdf |
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| Zusammenfassung |
| 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 (OCB). 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) in Longyearbyen
from December 1995 to January 2014 in wintertime is performed. By restricting
the location of the OI 630.0 nm data to be near local zenith, where the MSP has
the highest spatial resolution, the mapping errors were significantly reduced for
the AEB. 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
post-noon at sub-auroral latitudes could result in a stronger refraction of the HF
radar signals in the noon sector. The changing HF radar operating frequency also
has a refraction effect that contributes to the final location of the HF radar echoes. |
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