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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.
The geomagnetic storm causing this event is believed to be the result of two separate events known as coronal mass ejections (CME) on March 10 and 12, 1989. [2] A few days before, on March 6, a very large X15-class solar flare also occurred. [3]
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
A solar flare from a sunspot region associated with this activity and preceding this period produced the then largest flare detected during the Space Age at about X20 (the first event to saturate spaceborne monitoring instruments, this was exceeded in 2003) but was directed away from Earth.
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The communications blackouts that affect spacecraft re-entering the Earth's atmosphere, which are also known as radio blackouts, ionization blackouts, or reentry blackouts, are caused by an envelope of ionized air around the craft, created by the heat from the compression of the atmosphere by the craft. The ionized air interferes with radio ...
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 ...