How do you beat a star like a drum?
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Guran's comment
Perhaps they are tinkering with the solar activity, turning stars into Yotta-watt, nano-bit/second beakons. (We would see the pattern eventually, but not before we looked at century-spanning data)
makes me think of astroseismology which is a newly available field of study since new instruments can resolve this for stars beyond our sun.
Rather than building huge power-hungry transmitters, how could an advanced civilization induce and modulate vibrations in their star that could be observed at interstellar distances but are the most miserly in energy consumption to cause?
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