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An experimental investigation into the possible connections between the zonal neutral wind speeds and equatorial plasma bubble drift velocities over the African equatorial region
Journal of Atmospheric and Solar-Terrestrial Physics ( IF 1.9 ) Pub Date : 2021-05-14 , DOI: 10.1016/j.jastp.2021.105663
D.I. Okoh , A.B. Rabiu , K. Shiokawa , Y. Otsuka , Q. Wu , G.K. Seemala , Z.T. Katamzi-Joseph

There is increasing interest to understand thermospheric neutral wind and ionized plasma coupling, especially by using empirical observations. This is the first study that reports simultaneous measurements of thermospheric neutral wind and equatorial plasma bubble (EPB) speeds over the African equatorial region. Neutral wind speeds were obtained using a Fabry-Perot interferometer (FPI), while EPB speeds were obtained using an all-sky optical imager. Both instruments are co-located in Abuja (Geographic: 8.99°N, 7.38°E; Geomagnetic: 1.60°S). Data for 11 nights of coincident neutral wind and EPB speed observations were used. The neutral wind speeds were in the range of about −30 to 300 m/s, while EPB speeds were in the range of about 15–400 m/s. The speeds of both neutral winds and EPBs were generally observed to be faster during the early night hours and to slow down towards midnight. In some instances, the neutral wind and EPB speeds were comparable, an observation that is in agreement with full development of the F region dynamo. There were also instances in which the EPBs were faster or slower than the neutral winds. In one of the nights, a southward turning of the IMF-Bz was observed to cause a sudden increase in the EPB speed. For some nights, the neutral winds were faster than the EPBs during earlier hours of the nights, and the disparity reduced during the later hours of the nights. This was attributed to the possibility that the F region dynamo was yet to be fully developed during the earlier hours.



中文翻译:

对非洲赤道地区纬向中性风速与赤道等离子气泡漂移速度之间可能联系的实验研究

人们越来越热衷于了解热层中性风和电离等离子体耦合,尤其是通过经验观察。这是第一项报道同时测量非洲赤道地区热圈中性风和赤道等离子气泡(EPB)速度的研究。使用Fabry-Perot干涉仪(FPI)获得中性风速,而使用全天候光学成像仪获得EPB速度。两种仪器都位于阿布贾(地理位置:8.99°N,7.38°E;地磁:1.60°S)。使用了11个晚上同时发生的中风和EPB速度观测数据。中性风速在大约-30至300 m / s的范围内,而EPB的速度在大约15–400 m / s的范围内。通常观察到,在傍晚时分,中性风和EPB的速度都更快,直到午夜时才减速。在某些情况下,中性风和EPB的速度是可比的,这一观察结果与F地区发电机的全面发展相吻合。在某些情况下,EPB比中风更快或更慢。在一个夜晚中,观察到IMF-Bz向南转弯会导致EPB速度突然增加。在某些夜晚,中风比夜晚的EPB快,而夜晚的晚些时候的视差减小了。这归因于F区发电机在早些时候尚未完全发育的可能性。中性风和EPB速度是可比的,这一观察结果与F地区发电机的全面发展相吻合。在某些情况下,EPB比中风更快或更慢。在一个夜晚中,观察到IMF-Bz向南转弯会导致EPB速度突然增加。在某些夜晚,中风比夜晚的EPB快,而夜晚的晚些时候的视差减小了。这归因于F区发电机在早些时候尚未完全发育的可能性。中性风和EPB速度是可比的,这一观察结果与F地区发电机的全面发展相吻合。在某些情况下,EPB比中风更快或更慢。在一个夜晚中,观察到IMF-Bz向南转弯会导致EPB速度突然增加。在某些夜晚,中风比夜晚的EPB快,而夜晚的晚些时候的视差减小了。这归因于F区发电机在早些时候尚未完全发育的可能性。观察到IMF-Bz向南转弯会导致EPB速度突然增加。在某些夜晚,中风比夜晚的EPB快,而夜晚的晚些时候的视差减小了。这归因于F区发电机在早些时候尚未完全发育的可能性。观察到IMF-Bz向南转弯会导致EPB速度突然增加。在某些夜晚,中风比夜晚的EPB快,而夜晚的晚些时候的视差减小了。这归因于F区发电机在早些时候尚未完全发育的可能性。

更新日期:2021-05-18
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