奥利弗（1942，1948）曾跟踪流星尾迹测量风。
Oliver (1942,1948) has followed meteor trails to measure winds.
这就是慧尾总是指向背离太阳方向的原因，因为太阳射线和太阳风把慧尾吹向这个方向。
That's why comet tails always point away from the sun. Solar radiation and wind push them that way.
结果表明，一次风射流由于与上游横向射流的相互作用，在背火侧形成尾迹涡，在向火侧形成剪切涡。
It is showed that being the interaction between primary air and upstream fluid, the shear eddy the the wake are formed on the two sides of the primary air respectively.
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