A Can the signal WOW be explained by the maser effect?

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This hypothesis of scientists about the origin of the mysterious signal WOW seems plausible only on a superficial examination. In fact, such a strong coherent radiation requires a powerful initiating factor
This hypothesis of scientists about the origin of the mysterious signal WOW seems plausible only on a superficial examination. In fact, such a strong coherent radiation requires a powerful initiating factor, and the hydrogen atoms in the cloud themselves must be in an overexcited state in order to respond instantly. If the density of the initiating radiation is insufficient, then the atoms of the cloud will not receive it at once, some will receive it earlier, and some later. But then there will be no coherent radiation. Magtars were assumed to be the source of energy for such a "maser", but they are located at a big distance from those clouds that emitted similar signal, and for most of hydrogen clouds, located in the direction of such signals (as I read), there were no strong radiating objects at all. This means that the density of the initiating radiation was insufficient, which casts doubt on the correctness of this hypothesis (if, of course, I understood it correctly).
There are many hydrogen clouds, and at least one of them could be in in the direction of any signal.
 
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