Simultaneous Observations of ELF/VLF Rising-Tone Quasiperiodic Waves and Energetic Electron Precipitations in the High-Latitude Upper Ionosphere
Simultaneous Observations of ELF/VLF Rising-Tone Quasiperiodic Waves and Energetic Electron Precipitations in the High-Latitude Upper Ionosphere
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高纬度电离层上部 ELF/VLF 升调准周期波和高能电子降水的同时观测
DOI：
10.1029/2019ja027574
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发表时间：
2020
影响因子：
2.8
通讯作者：
Guo Feng
中科院分区：
文献类型：
--
作者：
Zhima Zeren;Huang Jianping;Shen Xuhui;Xia Zhiyang;Chen Lunjin;Piersanti Mirko;Yang Yanyan;Wang Qiao;Zeng Li;Lei Jungang;Chu Wei;Yan Rui;Zhao Shufan;Hu Yunpeng;Guo Feng
太阳同步圆轨道中国地震电磁卫星（CSES）记录了高纬电离层中伴随同时高能电子沉淀的准周期（QP）波。 CSES观察到的QP波的新特征是明显的升调结构和非常短的重复周期，这是以前的研究中没有经常报道的。 QP波的重复周期从大约1秒到超过20秒不等，波谱特性显示出动态结构和清晰的截止频率。大多数QP波出现在地磁纬度50度到65度左右，L壳层3.5度到4度左右，大部分出现在等离子层顶内。 QP 波以右手偏振向递减的 L 壳方向倾斜传播，波法线角从 30 度到 50 度不等。在检查的 68 个事件中，其中 19 个在波浪事件的某些部分显示出超低频 (ULF) 磁场脉动的同步变化。高能电子主要以双峰模式沉淀（类似于 400 至 550 keV 和类似于 700 至 800 keV）。没有发现明显的周期性沉淀通量。高能电子驱动自由能来调制哨声波的估计时间间隔从 0.04 到 30 度秒不等，这与观察到的重复周期（10 到 20 秒以上）大致一致。对于快速重复周期（类似于 1 至 2 秒）的 QP 波，很可能是由共轭电离层中的极/极低频（ELF/VLF）哨声模式波包的反弹引起的。
The quasiperiodic (QP) waves accompanied by simultaneous energetic electron precipitations in the high-latitude ionosphere were recorded by the sun-synchronous circular orbit China Seismo-Electromagnetic Satellite (CSES). The new features of QP waves observed by CSES are the well-pronounced rising-tone structures and very short repetition periods, which are not ofen reported by previous studies. The repetition period of QP waves varies from similar to 1 to over 20 s, with wave spectral properties displaying dynamic structures and clear cutoff frequencies. The majority of QP waves appear at geomagnetic latitudes from similar to 50 degrees to 65 degrees, and L shell from similar to 3.5 to 4, mostly inside the plasmapause. The QP waves obliquely propagate towards decreasing L shell directions with right-handed polarization, with wave normal angles varying from similar to 30 degrees to 50 degrees. Out of the 68 events examined, 19 of them show synchronous variations of ultralow frequency (ULF) magnetic field pulsations in certain portions of the wave event. The energetic electrons predominately precipitate in a double-peak pattern (similar to 400 to 550 keV and similar to 700 to 800 keV). No clear periodic precipitating fluxes were found. The estimated time interval of energetic electrons driving free energy to modulate the whistler-mode waves varies from 0.04 to 30 degrees s, which is roughly consistent with the observed repetition periods (10 to over 20 s). For the fast repetition period (similar to 1 to 2s) QP wave, it is likely caused by the bouncing of the extremely/very low frequency (ELF/VLF) whistler-mode wave packets from the conjugate ionosphere.