RADIO NOISE FROM THE SUN: Yesterday, March 2nd @ 1739 UT, sunspot AR2958 exploded, producing an M2-class solar flare. Moments after the explosion, a roar of static filled shortwave radio loudspeakers on the dayside of Earth. “It was a Type II solar radio burst,” says Thomas Ashcraft, who recorded the sounds from his observatory in rural New Mexico:
“The radio burst kicks in at the 15 second mark of the audio file,” says Ashcraft. “It’s a stereo file, with 23 MHz in one channel and 22 MHz in the other. Try listening using headphones. You might be able to hear the frequency drift.”
Type II solar radio bursts are caused by shock waves rippling through the sun’s atmosphere. They drift through the shortwave band, always from high to low frequencies, and almost always indicate that a CME is leaving the sun. A NOAA analysis of ths event suggests that the CME was moving about 690 km/s (2 million mph). Stay tuned for updates about a possible Earth-directed component.”The radio burst kicks in at the 15 second mark of the audio file,” says Ashcraft. “It’s a stereo file, with 23 MHz in one channel and 22 MHz in the other. Try listening using headphones. You might be able to hear the frequency drift.”
Type II solar radio bursts are caused by shock waves rippling through the sun’s atmosphere. They drift through the shortwave band, always from high to low frequencies, and almost always indicate that a CME is leaving the sun. A NOAA analysis of ths event suggests that the CME was moving about 690 km/s (2 million mph). Stay tuned for updates about a possible Earth-directed component.
https://spaceweather.com/
Mike Terry to WOR iog (2022-03-03)