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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-23
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-23
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 14 Mar 2019

Regular paper | 14 Mar 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Variation in altitude of high-frequency enhanced plasma line by the pump near the 5th electron gyro-harmonic

Jun Wu1, Jian Wu1, Michael T. Rietveld2, Ingemar Haggstrom3, Haisheng Zhao1, Tong Xu1, and Zhengwen Xu1 Jun Wu et al.
  • 1National Key laboratory of electromagnetic environment, China research institute of radio wave propagation, Beijing, 102206, China
  • 2EISCAT Scientific Association, 9027 Ramfjordbotn, Norway
  • 3EISCAT Scientific Association, 981 92 Kiruna, Sweden

Abstract. During an ionospheric heating campaign carried out at the European Incoherent Scatter Scientific Association (EISCAT), the ultra high frequency incoherent scatter (IS) radar observed a systematic variation in the altitude of the high-frequency enhanced plasma line (HFPL), which behaves depending on the pump frequency. Specifically, the HFPL altitude becomes lower when the pump lies above the 5th gyro-harmonic. The analysis shows that the enhanced electron temperature plays a decisive role in the descent in the HFPL altitude. That is, on the traveling path of the enhanced Langmuir wave, the enhanced electron temperature can only be matched by the low electron density at a lower altitude so that the Bragg condition can be satisfied, as expected from the dispersion relation of Langmuir wave.

Jun Wu et al.
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Jun Wu et al.
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