Direct comparison between magnetospheric plasma waves and polar mesosphere winter echoes in both hemispheres
Direct comparison between magnetospheric plasma waves and polar mesosphere winter echoes in both hemispheres
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两半球磁层等离子体波与极地中间层冬季回波的直接比较
DOI：
10.1029/2019ja026891
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
T.
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文献类型：
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作者：
Tanaka;Y.-M.;T. Nishiyama;A. Kadokura;M. Ozaki;Y. Miyoshi;K. Shiokawa;S.-I. Oyama;R. Kataoka;M. Tsutsumi;K. Nishimura;K. Sato;Y. Kasahara;A. Kumamoto;F. Tsuchiya;M. Fukizawa;M. Hikishima;S. Matsuda;A. Matsuoka;I. Shinohara;M. Nose;T.
本文首次直接比较了南极Syowa站(SYO；−69.00°S，39.58°E)的南极Syowa中层、平流层和对流层/非相干散射雷达(SYO；)和挪威的Alomar雷达系统(69.30°N，16.04°E)的ARASE卫星和高功率大气雷达同时观测到的磁层等离子体波和极地中层冬季回波(PMWE)。PMWE是在2017年3月21日格林尼治标准时间03-07时观测到的，恰好在高速太阳风流前方的共旋相互作用区到达之后。在此期间，04UT出现了一次孤立的亚暴。电磁离子回旋(EMIC)波和哨声模式和声波在磁赤道附近同时观测到，并表现出与PMWE相似的时间变化。这些结果表明，和声波和EMIC波是包括相对论电子在内的高能电子沉淀的驱动力，这使得PMWE可以在55到80公里的高度被探测到。用38.2 MHz成像测速仪测量的宇宙噪声吸收和在SYO用中频雷达测量的55-70公里处的低空回波也支持相对论电子沉淀。我们提出了一种可能的情景，在近地空间观察到的各种现象，如磁层等离子体波(EMIC波和和声波)、脉动极光、宇宙噪声吸收和PMWE，可以通过包含共转相互作用区的高速太阳风与磁层之间的相互作用来解释。
We present the first and direct comparison between magnetospheric plasma waves and polar mesosphere winter echoes (PMWE) simultaneously observed by the conjugate observation with Arase satellite and high‐power atmospheric radars in both hemispheres, namely, the Program of the Antarctic Syowa Mesosphere, Stratosphere, and Troposphere/Incoherent Scatter Radar at Syowa Station (SYO; −69.00°S, 39.58°E), Antarctica, and the Middle Atmosphere Alomar Radar System at Andøya (AND; 69.30°N, 16.04°E), Norway. The PMWE were observed during 03–07 UT on 21 March 2017, just after the arrival of corotating interaction region in front of high‐speed solar wind stream. An isolated substorm occurred at 04 UT during this interval. Electromagnetic ion cyclotron (EMIC) waves and whistler mode chorus waves were simultaneously observed near the magnetic equator and showed similar temporal variations to that of the PMWE. These results indicate that chorus waves as well as EMIC waves are drivers of precipitation of energetic electrons, including relativistic electrons, which make PMWE detectable at 55‐ to 80‐km altitude. Cosmic noise absorption measured with a 38.2‐MHz imaging riometer and low‐altitude echoes at 55–70 km measured with an medium‐frequency radar at SYO also support the relativistic electron precipitation. We suggest a possible scenario in which the various phenomena observed in near‐Earth space, such as magnetospheric plasma waves (EMIC waves and chorus waves), pulsating auroras, cosmic noise absorption, and PMWE, can be explained by the interaction between the high‐speed solar wind containing corotating interaction regions and the magnetosphere.