Big sunspot produces mysterious “Ocean Surf” sounds

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If you have a shortwave radio, you might have heard some unusual sounds this weekend. Big sunspot AR2738 is producing strong bursts of radio static. They sound like ocean surf.

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This is the sound of a big sunspot on the Sun. Recorded on April 13th by Thomas Ashcraft in New Mexico

These radio sounds are caused by beams of electrons – in this case, accelerated by B-class explosions in the sunspot’s magnetic canopy.

As the electrons slice through the sun’s atmosphere, they generate a ripple of plasma waves and radio emissions detectable on Earth 93 million miles away. Astronomers classify solar radio bursts into five types; Ashcraft’s recording captured a Type III.

There have been a lot of these sounds over the past week, and they appear to be intensifying now that the sunspot is  directly facing Earth,” says Ashcraft.

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[Space Weather]

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