|Earth Multi-hop Whistlers|
Lightning-generated whistler waves in Earth's magnetosphere
travel along closed field lines from one hemisphere to the other.
The duration of the whistling tone can vary from one second to
as little as one tenth of a second. The duration is related to
the length of the propagation path. Each time the whistler wave
approaches the base of Earth's ionosphere and is reflected,
it travels back on a slightly longer path.|
A spacecraft traveling in the region of whistler propagation can detect the same lightning-generated whistler on successive reflections. The resulting sequence of descending tones will be separated by the travel time of the reflected wave (on the order of a second or more). The duration of each successive tone will become shorter as the path length becomes longer with each reflection.
You can also view an AVI version of the video.
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