The slow swoosh you just heard is radio noise from the sun!
Como curiosidad sobre lo que ocurre en nuestro astro solar aquí tenemos una noticia desde Spaceweather.
An even stronger M2-class flare on June 12th (0055 UT) sparked a bright flash of extreme ultraviolet radiation, propelled a shock wave through the sun’s atmosphere, and hurled a billion-ton coronal mass ejection (CME) into space. The CME is expected to miss Earth–so no auroras. The M-flare also produced a Type II radio burst. “Although the sun was setting here in New Mexico, I was able to record the burst at 28 MHz and 24 MHz,” says amateur radio astronomer Thomas Ashcraft. “The slow swoosh you just heard is radio noise from the sun!” Another radio astronomer, Dick Flagg of Hawaii, used a radio spectrograph at Windward Community College in Oahu to record the burst’s dynamic spectrum. Sunspot 1081 appears to be in a state of slight decay, but that has not stopped the flares. Indeed, the decay may be contributing to magnetic instabilities underlying these explosions. Readers with solar telescopes are encouraged to monitor developments.