The sun is buzzing with activity! Recently, it unleashed two powerful X2.5 solar flares just a few hours apart. These flares came from a sunspot known as AR4419, located on the sun’s western edge. The first flare peaked at 9:07 p.m. EDT on April 23, followed by the second at 4:14 a.m. EDT on April 24. It’s been 78 days since we’ve seen X-flares this strong, as noted by solar physicist Ryan French.
These bursts of energy have significant effects on Earth. The radiation from the flares caused strong radio blackouts across the sunlit side of the planet, impacting places in the Pacific Ocean, Australia, and East Asia.
The recent solar activity didn’t stop there. Before these X-flares, there was a series of M-class flares on April 23 and even a rare event called a “sympathetic flare,” where eruptions happened in two different sunspot regions simultaneously.
Accompanying the X-flares were coronal mass ejections (CMEs), which are expansive bursts of solar plasma. However, since the sunspot is situated on the edge, these CMEs are unlikely to hit Earth directly. Still, scientists are monitoring them, as a glancing blow might trigger geomagnetic storms and spectacular auroras.
So, what exactly are solar flares? They are sudden explosions in the sun that release intense bursts of electromagnetic radiation, including X-rays and ultraviolet light. NASA categorizes them into classes: A, B, C, M, and X. Each letter represents a tenfold increase in intensity, with X being the most potent.
When these flares hit Earth’s atmosphere, they disrupt radio signals. Normally, high-frequency radio waves bounce off a layer in the atmosphere called the ionosphere, allowing for long-distance communication. However, intense solar activity can change the ionosphere’s conditions. During a flare, it becomes overly ionized, creating a denser environment that absorbs or distorts radio signals, leading to blackouts.
A recent survey by NOAA revealed that more than 70% of amateur radio operators experienced disruptions during solar flare events. As the Sun continues its 11-year activity cycle, we might see even more of these powerful flares, which will undoubtedly keep scientists and radio enthusiasts on their toes.
For ongoing updates on solar activity and its effects, check out NOAA’s Space Weather Prediction Center [here](https://www.swpc.noaa.gov/phenomena/solar-flares-radio-blackouts).
