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| Titel |
Production of artificial ionospheric layers by frequency sweeping near the 2nd gyroharmonic |
| VerfasserIn |
T. Pedersen, M. McCarrick, B. Reinisch, B. Watkins, R. Hamel, V. Paznukhov |
| 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 ; 29, no. 1 ; Nr. 29, no. 1 (2011-01-05), S.47-51 |
| Datensatznummer |
250016946
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| Publikation (Nr.) |
 copernicus.org/angeo-29-47-2011.pdf |
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| Zusammenfassung |
| Artificial ionospheric plasmas descending from the background F-region have
been observed on multiple occasions at the High Frequency Active Auroral
Research Program (HAARP) facility since it reached full 3.6 MW power.
Proximity of the transmitter frequency to the 2nd harmonic of the
electron gyrofrequency (2fce) has been noted as a requirement for their
occurrence, and their disappearance after only a few minutes has been
attributed to the increasing frequency mismatch at lower altitudes. We
report new experiments employing frequency sweeps to match 2fce in the
artificial plasmas as they descend. In addition to revealing the dependence
on the 2fce resonance, this technique reliably produces descending
plasmas in multiple transmitter beam positions and appears to increase their
stability and lifetime. High-speed ionosonde measurements are used to
monitor the altitude and density of the artificial plasmas during both the
formation and decay stages. |
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