An X5.4-class solar flare causing blooming, vertical streaking, and diffraction patterns to form in the image taken by the 131 Å (13.1 nm) sensor aboard the Solar Dynamics Observatory on 6 March 2012
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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 flares are thought to occur when stored magnetic energy in the Sun's atmosphere accelerates charged particles in the surrounding plasma. This results in the emission of electromagnetic radiation across the electromagnetic spectrum.
The extreme ultraviolet and x-ray radiation from solar flares is absorbed by the daylight side of Earth's upper atmosphere, in particular the ionosphere, and does not reach the surface. This absorption can temporarily increase the ionization of the ionosphere which may interfere with short-wave radio communication. The prediction of solar flares is an active area of research.
Flares also occur on other stars, where the term stellar flare applies.
A solarflare is a relatively intense, localized emission of electromagnetic radiation in the Sun's atmosphere. Flares occur in active regions and are...
magnetosphere. The geomagnetic storm was associated with a very bright solarflare on 1 September 1859. It was observed and recorded independently by British...
produced another X-class flare of magnitude 5.4–5.7 with another asymmetrical full-halo CME. The region also caused an S1 solar radiation storm with spikes...
strong C-class solarflare, hitting the planet on 9–10 December and causing bright aurorae at high latitudes. The first X-class solarflare of the cycle...
(see Solarflare § Soft X-ray classification). The following table lists the largest flares in this respect since June 1996, the beginning of solar cycle...
an M5.4 flare. Peaking at 01:56 UT on February 15, 2011, sunspot group 1158 produced an X2.2-class solarflare. Dubbed the Valentine's Day solar event by...
brightness for a few minutes. It is believed that the flares on flare stars are analogous to solar flares in that they are due to the magnetic energy stored...
protons, become accelerated either in the Sun's atmosphere during a solarflare or in interplanetary space by a coronal mass ejection shock. Other nuclei...
The solar storms of August 1972 were a historically powerful series of solar storms with intense to extreme solarflare, solar particle event, and geomagnetic...
began on the national day of France, Bastille Day. It involved a solarflare, a solar particle event, and a coronal mass ejection which caused a severe...
Solar minimum is the regular period of least solar activity in the Sun's 11-year solar cycle. During solar minimum, sunspot and solarflare activity diminishes...
Energy Solar Spectroscopic Imager (RHESSI, originally High Energy Solar Spectroscopic Imager or HESSI or Explorer 81) was a NASA solarflare observatory...
where they form the aurora. A solarflare is a sudden flash of brightness observed over the Sun's surface or the solar limb, which is interpreted as an...
peaking around October 28–29. This series of storms generated the largest solarflare ever recorded by the GOES system, modeled as strong as X45 (initially...
November 1859 meeting of the Royal Astronomical Society. The geomagnetic solarflare hit the Earth the following days, the main body of which fell over the...
numerous sunspots and solar flares were observed on the Sun, with the largest flare on September 1. This is referred to as the solar storm of 1859 or the...
"Measurement of SEU and total dose in geostationary orbit under normal and solarflare conditions". IEEE Transactions on Nuclear Science. 38 (6): 1686–1692...
sunspots. The first observations of solar flares occurred during this cycle. On September 1, 1859, the first solarflare was observed independently by Richard...
March 9, 1989. A few days before, on March 6, 1989, a very large X15 solarflare also occurred. At 2:44 am on March 13, 1989, a severe geomagnetic storm...
short-term with long-term patterns comprising space climate. Solar storms include: Solarflare, a large explosion in the Sun's atmosphere caused by tangling...
corona will be visible, and the chromosphere, solar prominences, coronal streamers and possibly even a solarflare may be seen. At the end of totality, the...
associated with the exceptionally intense Carrington–Hodgson white light solarflare on 1 September 1859. This event produced auroras so widespread and extraordinarily...
K, Ca, Ti, and Fe) present in Ross 128, finding that the star has near solar metallicity. Ross 128 b is a closely orbiting planet, with a year (orbital...
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