Strong Langmuir turbulence observed during EISCAT dual-radar high-frequency modification experiments

• Main Authors: Isham Arecibo, B. Isham, C. La Hoz, T. B. Leyser, M. T. Rietveld, T. Hagfors
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Langmuir; EISCAT
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.51.1414

. A major goal of ionospheric high power radio wave modification experiments is the unraveling of the physics of the plasma turbulence created by the high frequency (HF) pump wave. The signature of this turbulence can be seen in the plasma line spectrum obtained from an incoherent scatter (sometimes called Thomson scatter) very high or ultra high frequency (VHF or UHF) radar probe beam. Here we present data obtained from the first ever dual-radar chirped incoherent scatter observations. These data were taken at the EISCAT observatory in northern Scandinavia. EISCAT is unique in that it operates incoherent scatter systems at two distinct frequencies; it is also one of only three sites worldwide possessing co-located ISR and HF ionospheric modification facilities. The data show a pump-induced line at the pump reflection height along with enhancements along the natural Langmuir frequency profile just below the reflection altitude. Together, these characteristics provide an unmistakable si.