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Wu, Jun; Wu, Jian; Rietveld, M. T.; Haggstrom, I.; Zhao, Haisheng; Xu, Zhengwen
Journal of geophysical research. Space physics, January 2017, 2017-01-00, 20170101, 2017, Letnik: 122, Številka: 1Journal Article
The experimental phenomena involving the changes in electron temperature and electron density as a function of pump frequency during an ionospheric heating campaign at European Incoherent Scatter near Tromsø, Norway, are reported. When the pump frequency is slightly above the fifth electron gyrofrequency, the UHF radar observation shows some apparent enhancements over a wide altitude range in radar echo, ion line, and electron density respectively, which are apparently altitude independent and consistent temporally with the upshifting and spread of plasma line around the reflection altitude. However, they do not, in fact, correspond to true increase in electron density. Based on some existing theories, some discussions are presented to try to explain the above enhancements and the upshifting and spread of plasma line. Even so, the mechanism remains to be determined. In addition, the observation also shows some enhancements in electron temperature as a function of pump frequency around the reflection altitude of the pump, which are dependent on the behavior of dispersion of the upper hybrid wave near the fifth electron gyrofrequency. Key Points UHF radar observed enhancements in electron density with an altitude extent do not, in fact, correspond to a true increase in electron density The upshifting and spread of plasma lines above pump frequency shows the correlation in heating cycle with the above enhancements The enhancement in electron temperature occurring as a function of pump frequency around the reflection altitude of the pump
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