Structure and Movement of Es Detected by Loran Observations
Structure and Movement of Es Detected by Loran Observations
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罗兰观测发现的 Es 结构和运动
DOI：
10.5636/jgg.16.75
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发表时间：
1964
期刊：
影响因子：
--
通讯作者：
C. Nemoto
中科院分区：
文献类型：
--
作者：
K. Sinno;Choshichi Ouchi;C. Nemoto
通过测量Loran站发射的1.85Mc/s脉冲波和电离层垂直探测，对Es区的运动进行了研究。在夜间，通常可以观察到在Es区域的大横向尺度的移动云，它们要么是孤立的，要么是成群的，就像有时在对流层中看到的波浪状云一样。从各种观测资料推断出其速度约为80米/秒，方向为西南方向。由本实验推断，观测到的Es层有两种类型：第一种类型是由于层流风切变产生的电磁再分布而形成的水平分层薄层；第二种类型是由若干长约100km、宽约10km的超长电离区组成，这可能是由于那里盛行的风切变的流体动力不稳定造成的。
A study is made of movements in the Es region by means of measurements of pulsed waves at 1.85Mc/s emitted from a Loran station and of ionospheric vertical soundings.Moving clouds in the Es region of large lateral dimensions are usually observed during the night either isolated or grouped like the wavy clouds sometimes seen in the troposphere. The speed of about 80m/sec and the direction towards the southwest are deduced from various kinds of observations.It is inferred from this experiment that the observed Es layer is of two types: the first is the horizontally stratified thin layer produced by electromagnetic re-distribution due to the laminar wind shear and the second consists of a number of elongated regions of excess ionization, being of the order of 100km long and 10km wide, which may be caused by hydrodynamical instability in the wind shear prevailing there.