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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Evidence for Deep Ingression of the Midlatitude MSTID Into As Low as ~3.5° Magnetic Latitude
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Evidence for Deep Ingression of the Midlatitude MSTID Into As Low as ~3.5° Magnetic Latitude

机译：深进侵中间纬度的证据MSTID成低磁纬度~ 3.5°

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摘要

An observational evidence of medium-scale traveling ionospheric disturbances (MSTIDs) reaching to magnetic latitude as low as ~3.5° over the Indian sector is provided for the first time based on OI 630-nm airglow imaging observation from a low-latitude station, Gadanki (13.5°N, 79.2°E; 6.6° magnetic latitude), on 12 January 2016. The horizontal wavelength, horizontal phase velocity, and period of the MSTID are found to be 160 ± 6 km, 138 ± 14 m/s, and 19.5 ± 3 min, respectively. These phase fronts are observed to move toward southwest with a propagation angle of ~235° ± 1° with respect to north. In addition to the MSTID, a strong quasiperiodic southward moving wave (QPSMW) from the evening to midnight interval and a small-scale southward moving wave structure with wavelength and periodicity different from the QPSMW are also detected on the same night. Horizontal wavelength, horizontal phase velocity, and period of the QPSMW are estimated to be 367 ± 14 km, 131 ± 18 m/s, and 46.7 ± 13 min, respectively, and those of the small-scale southward moving wave are found to be 157 ± 4 km, 121 ± 17.8 m/s, and 21.7 ± 3.4 min, respectively. Global Positioning System-total electron content maps suggest that the weak and asymmetric equatorial ionization anomaly helped deep ingression of the MSTID on this night. The descent of the F layer seems to have caused the dissipation of the MSTID and QPSMW closer to the dip equator on this night. Therefore, the present investigation shows that the midlatitude MSTIDs can influence the F region plasma processes even over very low latitudes under favorable background conditions.
机译：一个中等规模的观测证据旅行电离层扰动(MSTIDs)达到磁纬度低至~ 3.5°在印度部门提供第一根据OI 630 nm大气光成像观察从低纬度站,Gadanki(13.5°N, 79.2°E;2016年1月。水平相速度和时期MSTID发现160±6公里,138±14米/秒,分别和19.5±3分钟。方面观察西南走向传播角度~ 235°±1°与尊重北方。准周期的向南移动波(QPSMW)晚上午夜间隔和小规模向南移动波结构波长和频率不同QPSMW也发现在同一个晚上。横向波长,水平相速度,和时期QPSMW估计是367±14公里,131±18 m / s, 46.7±13分钟,分别和小规模的向南移动波发现157±4公里,121±17.8 m / s, 21.7±3.4分钟,分别。全球定位系统总电子含量地图显示,软弱和不对称赤道电离异常帮助深进入MSTID在这个晚上。F层的下降似乎已经造成了耗散MSTID QPSMW接近磁赤道在这个晚上。调查表明,中间纬度MSTIDs甚至可以影响F区等离子体过程在非常低的纬度下有利背景条件。

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