Daytime midlatitude D region parameters at solar minimum from short-path VLF phase and amplitude
Daytime midlatitude D region parameters at solar minimum from short-path VLF phase and amplitude
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短程 VLF 相位和振幅的日间中纬度 D 区太阳极小期参数
DOI：
10.1029/2010ja016248
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发表时间：
2011
影响因子：
--
通讯作者：
C. Rodger
中科院分区：
文献类型：
--
作者：
N. Thomson;M. Clilverd;C. Rodger
[1]利用观测到的在短路径（约360公里）上传播的甚低频无线电信号的相位和幅度，在盛夏接近太阳活动极小期时，在地磁纬度为153.5 °的地球电离层（D区）最低边缘寻找改进的参数。相位，相对于全球定位系统1秒脉冲，和振幅都测量了附近（距离110公里）的发射机，其中直接地波是非常主要的，并在距离1360公里附近的电离层反射波形成一个（模态）最小值与（直接）地波。这些信号来自24.0 kHz发射机NAA，位于美国附近的缅因州海岸。加拿大边界，向东-东北方向延伸约360公里，主要在海上延伸至圣约翰和爱德华王子岛。因此，在地磁纬度为53.5°的正午、仲夏电离层的底部边缘可以用H′ = 71.8 ± 0.6 km和β = 0.335 ± 0.025 km−1来很好地模拟，其中H′和β是美国海军在其地球电离层甚低频无线电波导计划中使用的Wait的传统高度和锐度参数。还利用观测到的银河宇宙线通量，通过内插估算了β随纬度的变化。
[1] Observed phases and amplitudes of VLF radio signals propagating on a short (∼360 km) path are used to find improved parameters for the lowest edge of the (D region of the) Earth's ionosphere at a geomagnetic latitude of ∼53.5° in midsummer near solar minimum. The phases, relative to GPS 1 s pulses, and the amplitudes were measured both near (∼110 km from) the transmitter, where the direct ground wave is very dominant, and at distances of ∼360 km near where the ionospherically reflected waves form a (modal) minimum with the (direct) ground wave. The signals came from the 24.0 kHz transmitter, NAA, on the coast of Maine near the U.S.-Canada border, propagating ∼360 km E-NE, mainly over the sea, to Saint John and Prince Edward Island. The bottom edge of the midday, midsummer, ionosphere at ∼53.5° geomagnetic latitude was thus found to be well modeled by H′ = 71.8 ± 0.6 km and β = 0.335 ± 0.025 km−1 where H′ and β are Wait's traditional height and sharpness parameters used by the U.S. Navy in their Earth-ionosphere VLF radio waveguide programs. The variation of β with latitude is also estimated with the aid of interpolation using measured galactic cosmic ray fluxes.