Production of artificial ionospheric layers by frequency sweeping near the 2nd gyroharmonic
- Resource Type
- Authors
- V. V. Paznukhov; Brenton Watkins; Todd Pedersen; Ryan Hamel; Michael McCarrick; Bodo W. Reinisch
- Source
- Annales Geophysicae, Vol 29, Pp 47-51 (2011)
- Subject
- Physics
Atmospheric Science
High Frequency Active Auroral Research Program
Transmitter
lcsh:QC801-809
Resonance
Geology
Astronomy and Astrophysics
Geophysics
Plasma
lcsh:QC1-999
Computational physics
lcsh:Geophysics. Cosmic physics
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)
Harmonic
lcsh:Q
Ionosphere
lcsh:Science
Ionosonde
Beam (structure)
lcsh:Physics
- Language
- English
- ISSN
- 1432-0576
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.