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| Titel |
Investigation of the relationship between optical auroral forms and HF radar E region backscatter |
| VerfasserIn |
S. E. Milan, Mark Lester, N. Sato, H. Takizawa, J.-P. Villain |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 6 ; Nr. 18, no. 6, S.608-617 |
| Datensatznummer |
250014016
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| Publikation (Nr.) |
 copernicus.org/angeo-18-608-2000.pdf |
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| Zusammenfassung |
The SuperDARN HF radars have been employed in
the past to investigate the spectral characteristics of coherent backscatter
from L-shell aligned features in the auroral E region. The present study
employs all-sky camera observations of the aurora from Husafell, Iceland, and
the two SuperDARN radars located on Iceland, Þykkvibær and Stokkseyri, to
determine the optical signature of such backscatter features. It is shown that,
especially during quiet geomagnetic conditions, the backscatter region is
closely associated with east-west aligned diffuse auroral features, and that the
two move in tandem with each other. This association between optical and radar
aurora has repercussions for the instability mechanisms responsible for
generating the E region irregularities from which radars scatter. This is
discussed and compared with previous studies investigating the relationship
between optical and VHF radar aurora. In addition, although it is known that E
region backscatter is commonly observed by SuperDARN radars, the present study
demonstrates for the first time that multiple radars can observe the same
feature to extend over at least 3 h of magnetic local time, allowing
precipitation features to be mapped over large portions of the auroral zone.
Key words: Ionosphere (particle precipitation; plasma
waves and instabilities) |
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