The Apparent Behavior of Electron Density during an Alternating O/X-Mode Heating Experiment

• Published in: Universe
• Main Authors: Zeyun Li, Qingfeng Li, Hanxian Fang, Hongwei Gong
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2021
• Subjects: ionospheric modification; plasma line; ion line; electron density; Elementary particle physics; QC793-793.5; Norway; Tromsø; EISCAT
• Online Access: https://doi.org/10.3390/universe7080274; https://doaj.org/article/80114ee5226047d09d9b57cd19239c81

We present the observations of the artificial ionospheric modification experiment of EISCAT on 18 October 2012 in Tromsø, Norway. When the pump of alternating O mode and X mode is switched on, the UHF radar observation shows some strong enhancements in electron density, ion lines and plasma lines. Based on some existing theories, we find the following: First, during the experiment, the frequency of plasma line ( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>L</mi></msub></mrow></semantics></math> ), ion line ( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mrow><mi>i</mi><mi>a</mi></mrow></msub></mrow></semantics></math> ) and pump ( <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>h</mi></msub></mrow></semantics></math> ) matches <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>L</mi></msub></mrow></semantics></math> = <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mi>h</mi></msub></mrow></semantics></math> − 3 <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>f</mi><mrow><mi>i</mi><mi>a</mi></mrow></msub></mrow></semantics></math> and = <math xmlns="http://www.w3.org/1998/Math/MathML" ...