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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.
Solar radio bursts are brief periods during which the Sun's radio emission is elevated above the background level. [16] They are signatures of the same processes that lead to the more widely-known forms of solar activity such as sunspots, solar flares, and coronal mass ejections. [17]
A corona ( pl.: coronas or coronae) is the outermost layer of a star 's atmosphere. It is a hot but relatively dim region of plasma populated by intermittent coronal structures known as solar prominences or filaments. The Sun 's corona lies above the chromosphere and extends millions of kilometres into outer space.
When that X-ray image (blue and green) is overlaid onto an infrared photo from the Solar Dynamics Observatory (in orange), it shows how X-rays relate to high-temperature solar activity like flares ...
Updated Wed, Mar 18, 2015 ยท 1 min read. Here's the first X-class solar flare of 2015, which erupted on March 11th. Here's the good part: it was so powerful it caused radio blackouts in many parts ...
NuSTAR, launched in 2012, is an orbiting X-ray observatory But NASA makes an exception with its Nuclear Spectroscopic Telescope Array, or NuSTAR. X-ray probe spots tiny flares heating the sun
The Most Powerful Solar Flares Ever Recorded (NASA's SpaceWeather.com) Solar Proton Events Affecting the Earth Environment (1976 - present) (SWPC) Archive of the most severe solar storms (Solarstorms.org) GOES X-ray Solar Imager Greatest Hits; Riley, Pete; J. J. Love (2017). "Extreme geomagnetic storms: Probabilistic forecasts and their ...
Post-eruptive loops in the wake of a solar flare, image taken by the TRACE satellite (photo by NASA). In solar physics, a solar particle event (SPE), also known as a solar energetic particle event or solar radiation storm, [a] [1] is a solar phenomenon which occurs when particles emitted by the Sun, mostly protons, become accelerated either in the Sun's atmosphere during a solar flare or in ...