They sound like ocean surf. Strong bursts of shortwave radiation are reaching Earth from big sunspot AR2738.
Space Weather News for April 15, 2019
http://spaceweather.com
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SUNSPOT RADIO BURSTS: Massive sunspot AR2738 is sending bursts of radio energy toward Earth strong enough to make audible noises in the loudspeakers of common shortwave receivers. An amateur radio astronomer in New Mexico recorded some of the bursts this weekend--and they sound like ocean surf. Visit today's edition of Spaceweather.com to hear the sounds and find out how you can detect them in your own backyard.
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Above: This dynamic spectrum shows a series of solar radio bursts recorded by amateur radio astronomer Thomas Ashcraft in New Mexico on April 13, 2019. The source of these bursts is sunspot AR2738.
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