Stimulated electromagnetic emissions spectrum observed during an X-mode heating experiment at the European Incoherent Scatter Scientific Association

• Published in: Earth and Planetary Physics
• Main Authors: Xiang Wang, Chen Zhou, Tong Xu, Farideh Honary, Michael Rietveld, Vladimir Frolov
• Format: Article in Journal/Newspaper
• Language: English
• Published: Science Press 2019
• Subjects: artificial ionosphere modification; stimulated electromagnetic emissions; extraordinary electromagnetic wave; european incoherent scatter scientific association (eiscat); Science; Q; Geophysics. Cosmic physics; QC801-809; Environmental sciences; GE1-350; Norway; Tromsø; EISCAT
• Online Access: https://doi.org/10.26464/epp2019042; https://doaj.org/article/21396cbbb21b413ab65c8030ea3169b6

An extraordinary (X-mode) electromagnetic wave, injected into the ionosphere by the ground-based heating facility at Tromsø, Norway, was utilized to modify the ionosphere on November 6, 2017. The high-power high-frequency transmitter facility located at Tromsø belongs to the European Incoherent Scatter Scientific Association. In the experiment, stimulated electromagnetic emission (SEE) spectra were observed. A narrow continuum occurred under cold-start conditions and showed an overshoot effect lasting several seconds. Cascading peaks occurred on both sides of the heating frequency only in the preconditioned ionosphere and also showed an overshoot effect. These SEE features are probably related to the ponderomotive process in the X-mode heating experiment and are helpful for understanding the physical mechanism that generated them during the X-mode heating experiment. The features observed in the X-mode heating experiments are novel and require further investigation.