Fabry-Perot interferometer measurements of neutral winds and F2 layer variations at the magnetic equator

Fabry-Perot interferometer measurements of neutral winds and F2 layer variations at the magnetic equator
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法布里-珀罗干涉仪测量磁赤道处的中性风和 F2 层变化

DOI:
10.1007/s00585-998-0731-4
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发表时间:
1998
影响因子:
1.9
通讯作者:
E. Kone
E. Kone
中科院分区:
地球科学3区
文献类型:
--
作者:
P. Vila;D. Rees;P. Merrien;E. Kone

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被引文献

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这封信介绍了1994年在科霍戈(象牙海岸,地理纬度9.25°N,经度355°E,倾角纬度-2.5°)建立的法布里-珀罗干涉仪测量的倾角赤道附近F2层水平中性风变化的一些夜间观测结果。我们的仪器使用630 nm(O 1D)线来确定200和400公里高度之间的氧原子的径向多普勒速度。1994年11月至1995年3月的第一批结果表明,持续的东风,以及频繁的大于50 ms-1的南风。与在科霍戈、瓦加杜古、(布基纳法索,倾角+1.5°)和达喀尔(塞内加尔,倾角+5 °),它们说明了热层风对F2层密度的各种影响:(1)中尺度演变(几个103公里和几个100分钟的尺度);(2)局地起伏(几百公里和几十分钟的特征时间)。我们报告这些波动和讨论的机会,以提高时间分辨率的法布里-珀罗干涉仪在科霍戈。
This letter presents some night-time observations of neutral wind variations at F2 layer levels near the dip equator, measured by the Fabry-Perot interferometer set up in 1994 at Korhogo (Ivory Coast, geographic latitude 9.25°N, longitude 355°E, dip latitude -2.5°). Our instrument uses the 630 nm (O1D) line to determine radial Doppler velocities of the oxygen atoms between 200 and 400 km altitude. First results for November 1994 to March 1995 reveal persistent eastward flows, and frequent intervals of southward winds of larger than 50 ms−1 velocity. Compared with the simultaneous ionospheric patterns deduced from the three West African equatorial ionosondes at Korhogo, Ouagadougou (Burkina-Faso, dip latitude +1.5°) and Dakar (Sénégal, dip latitude + 5°), they illustrate various impacts of the thermospheric winds on F2 layer density: (1) on the mesoscale evolution (a few 103 km and a few 100 minutes scales) and (2) on local fluctuations (hundreds of km and tens of minutes characteristic times). We report on these fluctuations and discuss the opportunity to improve the time-resolution of the Fabry-Perot interferometer at Korhogo.