The Electromagnetic Emissions and Plasma Modulations at Middle Latitudes Related to SURA‐CSES Experiments in 2018

A total of 17 SURA‐China Seismo‐Electromagnetic Satellite (CSES) experiments in 2018 have been summarized and analyzed in multiple parameters detected in the topside ionosphere at altitude of 507 km from CSES. Most of them were fulfilled with underdense heating condition, and no any artificial densi...

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Bibliographic Details
Published in:Radio science 2020-08, Vol.55 (8), p.n/a
Main Authors: Zhang, Xuemin, Frolov, Vladimir, Shen, Xuhui, Wang, Yalu, Zhou, Chen, Lu, Hengxin, Huang, Jianping, Ryabov, Alexander, Zhai, Dulin
Format: Article
Language:English
Subjects:
Amplitude modulation
CSES
Daytime
electric field
Electric fields
Frequencies
High frequencies
Ionosphere
Night
Parameters
plasma modulation
Radio waves
SURA
Transmitters
underdense heating
Very Low Frequencies
X mode
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Summary:A total of 17 SURA‐China Seismo‐Electromagnetic Satellite (CSES) experiments in 2018 have been summarized and analyzed in multiple parameters detected in the topside ionosphere at altitude of 507 km from CSES. Most of them were fulfilled with underdense heating condition, and no any artificial density duct had been detected onboard CSES, but some plasma perturbations were actually observed in lower and topside ionosphere. Among them, different modulated waves were also transmitted by [power on, power off] and amplitude modulation modes on the pumping high‐frequency (HF) wave from SURA, and some were illustrated in HF electric field from CSES in local nighttime, one being verified at fmod in single component of very low frequency (VLF) electric field in local daytime. In addition, X mode‐emitted HF waves excited a filamentary structure on the existing VLF transmitters in local daytime, being different with those in O‐mode HF waves to enhance the VLF transmitter signals and widen their frequency band in local nighttime. These phenomena and their coupling process were discussed finally on the interaction of radio waves with plasma parameters in ionosphere. Key Points The SURA antenna pattern was measured, and the CSES HF receiver was tested One AM signal at fmod = 2,017 Hz was detected in VLF electric field due to the nonlinear demodulation under geomagnetic disturbed condition An interesting filamentary special structure occurred on the signal at 19 kHz under X‐mode pumping due to lower ionosphere heating
ISSN:0048-6604
1944-799X
DOI:10.1029/2019RS007040