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| Titel |
Artificial E-region field-aligned plasma irregularities generated at pump frequencies near the second electron gyroharmonic |
| VerfasserIn |
D. L. Hysell, E. Nossa |
| 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 ; 27, no. 7 ; Nr. 27, no. 7 (2009-07-07), S.2711-2720 |
| Datensatznummer |
250016583
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2711-2009.pdf |
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| Zusammenfassung |
| E region ionospheric modification experiments have been
performed at HAARP using pump frequencies about 50 kHz above and below
the second electron gyroharmonic frequency. Artificial E region
field-aligned plasma density irregularities (FAIs) were created and
observed using the imaging coherent scatter radar near Homer, Alaska.
Echoes from FAIs generated with pump frequencies above and below
2Ωe did not appear to differ significantly in experiments
conducted on summer afternoons in 2008, and the resonance instability
seemed to be at work in either case. We argue that upper hybrid wave
trapping and resonance instability at pump frequencies below the
second electron gyroharmonic frequency are permitted theoretically
when the effects of finite parallel wavenumbers are considered. Echoes
from a sporadic E layer were observed to be somewhat weaker when
the pump frequency was 50 kHz below the second electron gyroharmonic
frequency. This may indicate that finite parallel wavenumbers are
inconsistent with wave trapping in thin sporadic E ionization
layers. |
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