Characteristics of mesosphere echoes over Antarctica obtained using PANSY and MF radars
Characteristics of mesosphere echoes over Antarctica obtained using PANSY and MF radars
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DOI：
10.2151/sola.13a-004
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发表时间：
2016-03
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影响因子：
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通讯作者：
M. Tsutsumi;Kaoru Sato;Toru Sato;Takuji Nakamura;K. Nishimura;Y. Tomikawa;M. Kohma
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文献类型：
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作者：
M. Tsutsumi;Kaoru Sato;Toru Sato;Takuji Nakamura;K. Nishimura;Y. Tomikawa;M. Kohma
利用南极昭和站（69 S）的PANSY雷达（47 MHz）和中频雷达（2.4 MHz）探测到的中间层回波特征，分析了中间层回波特征。PANSY雷达的冬季回波和70 - 75公里以下的低空MF回波大多共存，出现在白天和日落后的几个小时。夏季低层回波在两次雷达观测中都没有出现，说明这两次雷达回波的产生机制有密切的关系。当地的K指数和冬季回波的发生之间的高度相关性表明，由于电离粒子降水的电子密度增强是回波生成的触发器之一。在冬季，中频回波的到达角更各向同性。由于雪娃上空冬季的重力波活动要高得多，重力波破碎引起的较高湍流能量也可能是冬季回波及其各向同性行为产生的原因。进一步比较了两个系统的水平风速，并在60 - 90 km的高度区域内一致。（引文：Tsutsumi，M.，K. Sato，T. Sato，M. Kohma，T.中村，K. Nishimura和Y. Tomikawa，2017：使用PANSY和MF雷达获得的南极洲上空中层回波的特征。SOLA，13A，19−23，doi：10.2151/sola.13A-004.）
We investigated characteristics of mesosphere echoes over Syowa Station (69S) in the Antarctic, which were detected by the Program of the Antarctic Syowa Mesosphere, Stratosphere and Troposphere/Incoherent Scatter (PANSY) radar (47 MHz) and Medium Frequency (MF) radar (2.4 MHz). Winter echoes from the PANSY radar and low altitude MF echoes below approximately 70−75 km mostly coexisted, appearing during the daytime as well as for a few hours post sunset. Summer echoes in the lower height region were absent in both radar observations, suggesting a close relationship in the generation mechanisms of these two radar echoes. High correlation between local K-index and the occurrence of winter echoes suggested that electron density enhancement due to ionized particle precipitation was one of the triggers of echo generation. Angles of arrival of the MF echoes were more isotropic in winter. Because gravity wave activity is much higher in winter over Syowa, higher turbulence energy caused by gravity wave breaking may also be responsible for the generation of the winter echoes and their isotropic behavior. The horizontal wind velocities of the two systems were further compared and agreed well throughout the height region of 60−90 km. (Citation: Tsutsumi, M., K. Sato, T. Sato, M. Kohma, T. Nakamura, K. Nishimura, and Y. Tomikawa, 2017: Characteristics of mesosphere echoes over Antarctica obtained using PANSY and MF radars. SOLA, 13A, 19−23, doi:10.2151/sola.13A-004.)