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| Titel |
Determination of the electron temperature in the modified ionosphere over HAARP using the HF pumped Stimulated Brillouin Scatter (SBS) emission lines |
| VerfasserIn |
P. A. Bernhardt, C. A. Selcher, R. H. Lehmberg, S. Rodríguez, J. Thomason, M. McCarrick, G. Frazer |
| 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. 12 ; Nr. 27, no. 12 (2009-12-04), S.4409-4427 |
| Datensatznummer |
250016720
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4409-2009.pdf |
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| Zusammenfassung |
| An ordinary mode electromagnetic wave can decay into an ion acoustic wave
and a scattered electromagnetic wave by a process called stimulated
Brillouin scatter (SBS). The first detection of this process during
ionospheric modification with high power radio waves was reported by Norin
et al. (2009) using the HAARP transmitter in Alaska. Subsequent experiments
have provided additional verification of this process and quantitative
interpretation of the scattered wave frequency offsets to yield measurements
of the electron temperatures in the heated ionosphere. Using the SBS
technique, electron temperatures between 3000 and 4000 K were measured over
the HAARP facility. The matching conditions for decay of the high frequency
pump wave show that in addition to the production of an ion-acoustic wave,
an electrostatic ion cyclotron wave may also be produced by the generalized
SBS processes. Based on the matching condition theory, the first profiles of
the scattered wave amplitude are produced using the stimulated Brillouin
scatter (SBS) matching conditions. These profiles are consistent with
maximum ionospheric interactions at the upper-hybrid resonance height and at
a region just below the plasma resonance altitude where the pump wave
electric fields reach their maximum values. |
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