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When high power electromagnetic waves with frequencies near the peak plasma frequency are transmitted into the ionosphere, the parametric decay instability will be stimulated around the reflection altitude, which will excite Langmuir turbulence and enhance incoherent scatter spectra later. According to typical parameters of ionospheric modify-cation facilities at Tromse, the incoherent scatter spectra...
The polar winter ionospheric heating experiments with the heating frequency linearly varied are carried out on November 23, 2011 at Troms⊘, Norway. The heating waves were O-mode polarization. A double-peaked spectrum is present in the enhanced plasma lines which observed with UHF incoherent radar, and the two peaks are at different frequencies. The enhanced structure is present throughout all the...
We report on EISCAT ionospheric heating experiments carried out on 13 September 2010 at Tromsø, Norway. This paper focuses on the long-lasting enhanced ion- and plasma-lines observed by the VHF incoherent scatter radar. In previous experiments, the enhanced ion-lines observed by VHF radar lasted ~200ms. Observations of long-lasting enhanced ion- and plasma-lines in the VHF radar have not been reported...
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