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Impact of the Ionosphere Disturbed by Rocket Plume on OTHR Radio Wave Propagation
Radio Science ( IF 1.6 ) Pub Date : 2021-01-27 , DOI: 10.1029/2020rs007183
Xin Ma 1 , Hanxian Fang 1, 2 , Sicheng Wang 1 , Shujie Chang 1
Affiliation  

The main chemicals of rocket exhaust plume are released into the ionosphere, which cause three‐dimensional (3‐D) disturbances. By simulating the disturbance, we investigate the influence of ionospheric disturbance by the chemical release on the propagation of over‐the‐horizon radar (OTHR) waves. Based on the absorption simulation model, the absorption loss of OTHR waves caused by rocket plume was simulated. Using 3‐D digital ray tracing, we simulated the propagation path of radio waves in the “ionospheric hole” region. The simulation results show that the absorption loss of short waves decreases with an increase in the frequency and elevation angle of the ray. The absorption loss in the year of high solar activity is significantly higher than that in the year of low solar activity. The absorption value is largest at noon and smallest at night. In terms of seasonal variation, the absorption of radio waves is strongest in summer and weakest in winter. Additionally, the ionospheric hole area increases with the release time. The 6 MHz high‐frequency waves cannot reach the disturbance height and are completely reflected to the ground. Most of the 8 MHz radio waves are reflected to the ground, and some of them pass through the ionosphere. The radio waves at 10, 15, and 20 MHz can pass through the hole area of the ionosphere. Moreover, the ionospheric disturbance generated by the plume has a focusing effect on the propagation of OTHR shortwaves. With the increase in radio frequency, the focusing height gradually increases, and the focusing effect gradually weakens.

中文翻译:

火箭羽干扰电离层对OTHR无线电波传播的影响

火箭尾气羽流中的主要化学物质释放到电离层中,从而引起三维(3D)扰动。通过模拟扰动,我们研究了化学释放对电离层扰动对超视距雷达(OTHR)波传播的影响。在吸收模拟模型的基础上,模拟了火箭羽流对OTHR波的吸收损失。使用3D数字射线追踪,我们模拟了“电离层孔”区域中无线电波的传播路径。仿真结果表明,短波的吸收损耗随着射线频率和仰角的增加而减小。高太阳活动年的吸收损失明显高于低太阳活动年的吸收损失。吸收值在中午最大,在晚上最小。就季节变化而言,无线电波的吸收在夏季最强,而在冬季最弱。另外,电离层孔的面积随释放时间的增加而增加。6 MHz的高频波无法达到干扰高度,并且会完全反射到地面。大多数8 MHz无线电波都反射到地面,其中一些通过电离层。10、15和20 MHz的无线电波可以穿过电离层的孔区域。此外,羽流产生的电离层扰动对OTHR短波的传播具有集中作用。随着射频的增加,聚焦高度逐渐增加,聚焦效果逐渐减弱。电离层孔的面积随释放时间的增加而增加。6 MHz的高频波无法达到干扰高度,并且会完全反射到地面。大多数8 MHz无线电波都反射到地面,其中一些通过电离层。10、15和20 MHz的无线电波可以穿过电离层的孔区域。此外,羽流产生的电离层扰动对OTHR短波的传播具有集中作用。随着射频的增加,聚焦高度逐渐增加,聚焦效果逐渐减弱。电离层孔的面积随释放时间的增加而增加。6 MHz的高频波无法达到干扰高度,并且会完全反射到地面。大多数8 MHz无线电波都反射到地面,其中一些通过电离层。10、15和20 MHz的无线电波可以穿过电离层的孔区域。此外,羽流产生的电离层扰动对OTHR短波的传播具有集中作用。随着射频的增加,聚焦高度逐渐增加,聚焦效果逐渐减弱。其中一些穿过电离层。10、15和20 MHz的无线电波可以穿过电离层的孔区域。此外,羽流产生的电离层扰动对OTHR短波的传播具有集中作用。随着射频的增加,聚焦高度逐渐增加,聚焦效果逐渐减弱。其中一些穿过电离层。10、15和20 MHz的无线电波可以穿过电离层的孔区域。此外,羽流产生的电离层扰动对OTHR短波的传播具有集中作用。随着射频的增加,聚焦高度逐渐增加,聚焦效果逐渐减弱。
更新日期:2021-01-27
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