Evidence of High Power HF Radiowave Self-Focusing in the Ionosphere: Preliminary Report of SURA-WIND Observations
NAVAL RESEARCH LAB WASHINGTON DC
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Experiments are currently being conducted using the Russian SURA ionospheric research facility in conjunction with the NASAWIND satellite. One objective is to investigate the effects of interactions of high power, high frequency radiowaves with the earths ionosphere. Recent experiments indicate that structured space plasmas along the propagation path impose a power law spectrum of intensity fluctuations on the transmitted waves, similar to scintillations. However, because the transmitted wave frequencies are near ionospheric plasma frequencies, other types of wave-plasma interactions may occur. One possible wave-plasma interaction is the self-focusing instability. In this brief report, we discuss preliminary results that suggest self-focusing was observed. The measurements can provide an important new diagnostic tool of high power radiowave interactions with the underdense ionosphere.
- Atmospheric Physics