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Exoplanet Transits as the Foundation of an Interstellar Communications Network
Duncan H. Forgan1,2
July 13, 2017

https://arxiv.org/pdf/1707.03730.pdf

Quote:An ETI ’A’ can communicate with ETI ’B’ if B is observing transiting planets in A’s star system, either by building structures to produce artificial transits observable by B, or by emitting signals at B during transit, at significantly lower energy consumption than typical electromagnetic transmission schemes.
I used a similar concept on this page for OA;
http://www.orionsarm.com/eg-article/48fa7379af7e0

the idea is that the statite energy-collection system which is suspended over the poles of this star can be opened and closed to allow CMEs to pass though; this action can be used to signal distant locations, by opening and closing the flaps using Morse code.
I've also seen a suggested comm method that uses a similar idea of 'the other guys will likely be looking in this direction'. In this case, the suggestion was that interstellar signals should be placed and timed in relation to supernova, on the theory that astronomers on other worlds would be looking at them and so would be more likely to pick up a signal coming from that same part of the sky.

Todd
(07-21-2017, 10:10 PM)stevebowers Wrote: [ -> ]I used a similar concept on this page for OA;
http://www.orionsarm.com/eg-article/48fa7379af7e0

the idea is that the statite energy-collection system which is suspended over the poles of this star can be opened and closed to allow CMEs to pass though; this action can be used to signal distant locations, by opening and closing the flaps using Morse code.

Presumably much more sophisticated message encoding algorithms could be used, too. If the opacity can be varied quickly, the data rate might be quite high.