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The 4 August flare was among the largest since records began. [10] It saturated the Solrad 9 X-ray sensor at approximately X5.3 but was estimated to be in the vicinity of X20, [11] the threshold of the very rarely reached R5 on the NOAA radio blackout space weather scale. [12] A radio burst of 76,000 sfu was measured at 1 GHz. [8]
A solar flare is a relatively intense, localized emission of electromagnetic radiation in the Sun's atmosphere. Flares occur in active regions and are often, but not always, accompanied by coronal mass ejections, solar particle events, and other eruptive solar phenomena. The occurrence of solar flares varies with the 11-year solar cycle.
Since 1996, geomagnetic storms and solar flares have been monitored from the Solar and Heliospheric Observatory (SOHO) satellite, a joint project of NASA and the European Space Agency (ESA). Extreme geomagnetic storms were registered in 2003 and 2024 , both sparking northern lights as far south as Florida.
Flares lead to brief radio blackouts for about 30 minutes in western US Powerful ‘X-class’ solar flare from rapidly growing sunspot triggers radio blackout in US Skip to main content
English: Active Region 1515 released an X1.1 class flare from the lower right of the sun on July 6, 2012, peaking at 7:08 PM EDT. This flare caused a radio blackout, labeled as an R3 on the National Oceanic and Atmospheric Administrations scale that goes from R1 to R5. Such blackouts can cause disruption to both high and low level radio ...
Radio disruption occurred across North and South America. ‘Amazing’ sun flare was one of the largest solar radio events ever recorded, NASA says Skip to main content
Four solar flares occurred within 5 days from sunspot AR 12192, which is both the largest sunspot of solar cycle 24 and the largest since 1990. On October 19 there was a major X1.1-class solar flare. On October 22 an M8.7-class flare was followed by an X1.6 event. The October 24 X3.1-class solar flare was strong enough to trigger a radio blackout.
What is an X-class solar flare? X-class flares are the biggest explosions from the sun. They can be 10 times the size of Earth, according to NASA, and produce as much energy as a billion hydrogen ...