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| Titel |
D region HF radar echoes associated with energetic particle precipitation and pulsating aurora |
| VerfasserIn |
S. E. Milan, K. Hosokawa, Mark Lester, N. Sato, H. Yamagishi, F. Honary |
| 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 ; 26, no. 7 ; Nr. 26, no. 7 (2008-07-14), S.1897-1904 |
| Datensatznummer |
250016155
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| Publikation (Nr.) |
 copernicus.org/angeo-26-1897-2008.pdf |
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| Zusammenfassung |
| Milan et al. (2001) identified a class of narrow,
slow-moving HF radar backscatter echoes which originate between altitudes of
80 and 100 km, the ionospheric D- and lower E-regions. These echoes appeared
to be associated with the occurrence of pulsating aurora, which are known to
be created by energetic electrons capable of penetrating to D region
altitudes. In this study we show that these echoes are observed in tandem
with enhancements in cosmic noise absorption (auroral absorption),
additional evidence that energetic (>30 keV) particle precipitation is
responsible for generating the irregularities from which a radar can
scatter. In addition, we show that the D region backscatter echoes occur
predominantly in the post-midnight sector during substorm recovery phase, in
common with auroral absorption events and pulsating aurora. |
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