The X-class solar flares are the most powerful flares.
The scientists also explained that the effects of the coronal mass though weakened, but the potential for further development of geomagnetic storms is still there. That flare was the strongest since 2015, at X2.2, but it was dwarfed just 3 hours later, at 8:02 a.m. EDT (1202 GMT), by an X9.3 flare, according to the National Oceanic and Atmospheric Administration's Space Weather Prediction Center (SWPC).
As NASA pointed out, when magnetic fields rise up from below the sun's surface, they eventually poke through, creating cool, dark patches on the sun. The flare, which peaked at 8.02am EDT, caused a radio blackout following the "shock arrival" of radiation from the sun.More news: Task force that helped during Harvey comes home
CMS and solar flares are different phenomena but often occur at the same time when it comes to the strongest solar flares. The magnetically filed activities result to an outward blast of energy that dramatically increases the solar surface temperature. A failure of telegraph systems was observed through Europe and North America in 1859 because of a massive solar storm. If a similar sized storm hit today, it is estimated it could cost around $2 trillion. The last X9 flare occurred in 2006 (coming in at X9.0). At the end of the active phase, these eruptions become increasingly rare but still can be powerful. Solar cycles last on average eleven years. Because of this, the Sun alternates between two periods: solar maximum - when sunspots are much more frequent on the Sun's surface - and solar minimum - when the Sun's surface is relatively sunspot free.
"This is not how it used to be and the rotation rate has slowed a bit at latitudes around about 60 degrees", study author Yvonne Elsworth, from the University of Birmingham, U.K, said. Although the wildfire smoke is expected to clear out, the forecast calls for the more usual kind of clouds.