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Wu, Jun; Wu, Jian; Rietveld, M. T.; Haggstrom, I.; Xu, Zhengwen; Zhao, Haisheng
Journal of geophysical research. Space physics, January 2018, 2018-01-00, 20180101, 2018, Letnik: 123, Številka: 1Journal Article
The ultrahigh‐frequency observation during an ionospheric heating experiment on 11 March 2014 at the European Incoherent Scatter Scientific Association Tromsø site illustrated a remarkable extension of observing altitudes of the enhanced plasma line and the ion line, implying that the enhanced ion acoustic wave and Langmuir wave should satisfy the Bragg condition within the extending altitude range. An analysis shows that the dependence of the wave number of the traveling ion acoustic wave on the profiles of enhanced electron temperature and ion mass, as are expected from the dispersion relation of the ion acoustic wave, leads to the extension of observing altitudes of the enhanced ion line. In addition, the altitude extension of the enhanced plasma line is dependent mainly on the profile of the electron density, although it is not independent of the profile of the electron temperature. Considering a small gradient profile of electron density, however, the enhanced electron temperature, as well as the thermal conduction along the magnetic field, may lead to the altitude extension of the enhanced plasma line. Key Points Enhanced plasma line and ion lines were observed by UHF ISR within the extending altitude range, where Bragg condition should be satisfied Within the altitude range, electron temperature and ion mass compensate each other so that ion acoustic wave satisfies Bragg condition For a small gradient profile of density, temperature and density compensate each other so that Langmuir wave satisfies Bragg condition
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