After a period of unexpected calm, the sun is active again!
A sunspot unleashed an intense X2-class solar flare on May, 5 2015, shown in the following image by NASA’s Solar Dynamics Observatory:
This X2-flare triggered a strong radio blackout for frequencies below 20 MHz over the Pacific side of Earth as shown in the map below:
This video presents the intense CME that hurled into space at more than 1100 km/s (2.5 million mph), but not heading for Earth:
Finally, the flare also caused a radio burst ressembling a roar very intricate if listened to with headphones:
This weird sound was produced by electrons generating a ripple of radio-loud plasma waves when they travelled through the sun’s atmosphere.