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| Titel |
Effects of multiple scatter on the propagation and absorption of electromagnetic waves in a field-aligned-striated cold magneto-plasma: implications for ionospheric modification experiments |
| VerfasserIn |
T. R. Robinson |
| 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 ; 20, no. 1 ; Nr. 20, no. 1, S.41-55 |
| Datensatznummer |
250014341
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| Publikation (Nr.) |
 copernicus.org/angeo-20-41-2002.pdf |
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| Zusammenfassung |
A new theory of the
propagation of low power electromagnetic test waves through the upper-hybrid
resonance layer in the presence of magnetic field-aligned plasma density
striations, which includes the effects of multiple scatter, is presented. The
case of sinusoidal striations in a cold magnetoplasma is treated rigorously and
then extended, in an approximate manner, to the broad-band striation spectrum
and warm plasma cases. In contrast to previous, single scatter theories, it is
found that the interaction layer is much broader than the wavelength of the
test wave. This is due to the combined electric fields of the scattered waves
becoming localised on the contour of a fixed plasma density, which corresponds
to a constant value for the local upper-hybrid resonance frequency over the
whole interaction region. The results are applied to the calculation of the
refractive index of an ordinary mode test wave during modification experiments
in the ionospheric F-region. Although strong anomalous absorption arises, no
new cutoffs occur at the upper-hybrid resonance, so that in contrast to the
predictions of previous single scatter theories, no additional reflections
occur there. These results are consistent with observations made during
ionospheric modification experiments at Tromsø, Norway.
Key words. Ionosphere (active
experiments; ionospheric irregularities) Radio science (ionospheric
propagation) |
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