The sun has just emitted the most potent
solar flare of the ongoing solar cycle, which commenced in 2019, as per an urgent update from the National Oceanic and Atmospheric Administration's (NOAA)
Space Weather Prediction Center.
This colossal flare registers as a category X8.7, significantly surpassing the
X2.2 flare that burst forth from the sun last week — sparking radio blackouts and widespread auroras on Earth, visible as distant as Mexico.
Nonetheless, the recent flare is improbable to incite any geomagnetic storms or aurora activity, as the sunspot cluster accountable for the eruption resides at the very periphery of the visible side of the sun, according to NOAA. However, terrestrial high-frequency radio blackouts are still anticipated.
In the event that the flare generates any coronal mass ejections (CMEs) — massive, high-velocity streams of charged solar particles — they are unlikely to directly affect Earth, as was the scenario during the vibrant auroral spectacle last weekend.
That being said, the identical formidable sunspot cluster — dubbed active sunspot region 3664 and spanning more than 15 Earths in width — is responsible for both last week's X2.2 flare and today's X8.7 flare, NOAA disclosed. The group has emitted numerous other X-class flares over the preceding days, but it will shortly be entirely obscured from our planet's view.
Solar flares constitute potent outbursts of electromagnetic radiation stemming from magnetic perturbations on the sun. They materialize when magnetic field lines in the sun's atmosphere become entangled and snap, releasing copious amounts of surplus energy, including potent X-rays and ultraviolet radiation. These convoluted lines emerge from sunspots — dimmer, cooler regions on the sun's surface that develop when magnetic fields from the sun's depths protrude to the surface.
Solar flares can also propel CMEs outward into space, colliding with any planets, satellites, or other entities in their trajectory. CMEs striking Earth trigger geomagnetic storms, culminating in auroras, as well as adverse impacts such as power grid disruptions and satellite glitches.
All of these extreme solar occurrences — solar flares, sunspots, and CMEs — proliferate during the pinnacle of the sun's 11-year activity cycle, known as solar maximum. The current cycle, solar cycle 25, commenced in 2019, and researchers speculate that the sun might soon enter its solar maximum phase, if it hasn't already. It's only after the peak recedes, and solar activity wanes anew, that scientists can conclusively determine its zenith.
The sun hasn't emitted any flares mightier than X8.7 since September 2017 when it discharged an X11.8 and X13.3 flare within a few days of each other, according to
spaceweatherlive.com.
