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| Titel |
Low-frequency ionospheric sounding with Narrow Bipolar Event lightning radio emissions: energy-reflectivity spectrum |
| VerfasserIn |
A. R. Jacobson, R. Holzworth, X.-M. Shao |
| 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 (2008-06-27), S.1793-1803 |
| Datensatznummer |
250016146
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| Publikation (Nr.) |
 copernicus.org/angeo-26-1793-2008.pdf |
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| Zusammenfassung |
| We analyze data on radio-reflection from the D-region of the lower
ionosphere, retrieving the energy-reflection coefficient in the frequency
range ~5–95 kHz. The data are the same as developed for a recent
study of ionospheric-reflection height, and are based on recordings of
powerful (multi-Gigawatt) radio emissions from a type of narrow (~10 μs) lightning discharge known as "Narrow Bipolar Events". The
sequential appearance of first the groundwave signal, and then the
ionospheric single-hop reflection signal, permits us to construct the
energy-reflection ratio. We infer the energy reflection's statistical
variation with solar zenith angle, angle-of-incidence, frequency, and
propagation azimuth. There is also a marginally-significant response of the
energy reflectivity to solar X-ray flux density. Finally, we review the
relationship of our results to previous published reports. |
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