by bystander » Thu Oct 25, 2012 3:53 am
Click to play embedded YouTube video.
X 1.2 Flare
The Sun emitted a significant solar flare on Oct. 22, 2012, peaking at 11:17 p.m. EDT. The flare came from an active region on the left side of the sun that has been numbered AR 1598, which has already been the source of a number of weaker flares. It was captured by SDO in the 131 Angstrom wavelength of extreme ultraviolet light. The movies covers less than an hour.
This flare was classified as an X.1-class flare. "X-class" denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, and so on. An X-class flare of this intensity can cause degradation or blackouts of radio communications for about an hour. This event did produce an impulsive R3 Solar Flare Radio Blackout. R3 is considered "Strong", meaning a wide area blackout of HF radio communication, loss of radio contact for about an hour on the sunlit side of Earth.
Credit: NASA/GSFC/SDO/AIA
Active Region on the Sun Emits Another Flare
NASA Goddard Space Flight Center | 2012 Oct 23
The sun emitted a significant solar flare on Oct. 22, 2012, peaking at 11:17 p.m. EDT. The flare came from an active region on the left side of the sun that has been numbered AR 1598, which has already been the source of a number of weaker flares. This flare was classified as an X1.8-class flare.
"X-class" denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, and on. An X-class flare of this intensity can cause degradation or blackouts of radio communications for about an hour.
Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. This can disrupt radio signals for anywhere from minutes to hours.
The National Oceanic and Atmospheric Association, which is the United States government's official source for space weather forecasts and alerts, categorized the radio blackout associated with this flare as an R3, on a scale from R1 to R5. It has since subsided.
Increased numbers of flares are quite common at the moment, since the sun's normal 11-year activity cycle is ramping up toward solar maximum, which is expected in 2013. Humans have tracked this solar cycle continuously since it was discovered in 1843, and it is normal for there to be many flares a day during the sun's peak activity. The first X-class flare of the current solar cycle occurred on Feb. 15, 2011 and there have been 15 X-class flares total in this cycle, including this one. The largest X-class flare in this cycle was an X6.9 on Aug. 9, 2011. This is the 7th X-class flare in 2012 with the largest being an X5.4 flare on March 7.
This flare did not have an associated Earth-directed coronal mass ejection (CME), another solar phenomenon that can send solar particles into space and affect electronic systems in satellites and on Earth.
Updates will be provided as needed.
Disco Sun: X-Class Flare Creates Strobe-Light Effect
Universe Today | Nancy Atkinson | 2012 Oct 23
Oh, snap! Another X-class flare from the Sun
Discover Blogs | Bad Astronomy | 2012 Oct 23
<< Previous SDO[float=left][img3=""]http://sdo.gsfc.nasa.gov/gallery/gallery/assets/preview/X1flare.jpg[/img3]
[youtube]https://www.youtube.com/watch?v=N3idSmR0ZYk[/youtube][/float]
[url=http://sdo.gsfc.nasa.gov/gallery/main.php?v=item&id=169][size=150][b][i]X 1.2 Flare[/i][/b][/size][/url]
[i]The Sun emitted a significant solar flare on Oct. 22, 2012, peaking at 11:17 p.m. EDT. The flare came from an active region on the left side of the sun that has been numbered AR 1598, which has already been the source of a number of weaker flares. It was captured by SDO in the 131 Angstrom wavelength of extreme ultraviolet light. The movies covers less than an hour.
This flare was classified as an X.1-class flare. "X-class" denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, and so on. An X-class flare of this intensity can cause degradation or blackouts of radio communications for about an hour. This event did produce an impulsive R3 Solar Flare Radio Blackout. R3 is considered "Strong", meaning a wide area blackout of HF radio communication, loss of radio contact for about an hour on the sunlit side of Earth.
[b]Credit: NASA/GSFC/SDO/AIA[/b][/i]
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[url=http://www.nasa.gov/mission_pages/sunearth/news/News102312-xflare.html][size=120][b][i]Active Region on the Sun Emits Another Flare[/i][/b][/size][/url]
NASA Goddard Space Flight Center | 2012 Oct 23
[quote][float=right][img3="[i]By observing the sun in a number of different wavelengths, NASA's telescopes can tease out different aspects of events on the sun. These four images of a solar flare on Oct. 22, 2012, show from the top left, and moving clockwise: light from the sun in the 171 Angstrom wavelength, which shows the structure of loops of solar material in the sun's atmosphere, the corona; light in 335 Angstroms, which highlights light from active regions in the corona; a magnetogram, which shows magnetically active regions on the sun; light in the 304 Angstrom wavelength, which shows light from the region of the sun's atmosphere where flares originate. [b](Credit: NASA/SDO/Goddard)[/b][/i]"]http://www.nasa.gov/images/content/699514main1_X1_Oct_23_4-ply-Labels-673.jpg[/img3][hr][/hr][/float]The sun emitted a significant solar flare on Oct. 22, 2012, peaking at 11:17 p.m. EDT. The flare came from an active region on the left side of the sun that has been numbered AR 1598, which has already been the source of a number of weaker flares. This flare was classified as an X1.8-class flare.
"X-class" denotes the most intense flares, while the number provides more information about its strength. An X2 is twice as intense as an X1, an X3 is three times as intense, and on. An X-class flare of this intensity can cause degradation or blackouts of radio communications for about an hour.
Solar flares are powerful bursts of radiation. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel. This can disrupt radio signals for anywhere from minutes to hours.
The National Oceanic and Atmospheric Association, which is the United States government's official source for space weather forecasts and alerts, categorized the radio blackout associated with this flare as an R3, on a scale from R1 to R5. It has since subsided.
Increased numbers of flares are quite common at the moment, since the sun's normal 11-year activity cycle is ramping up toward solar maximum, which is expected in 2013. Humans have tracked this solar cycle continuously since it was discovered in 1843, and it is normal for there to be many flares a day during the sun's peak activity. The first X-class flare of the current solar cycle occurred on Feb. 15, 2011 and there have been 15 X-class flares total in this cycle, including this one. The largest X-class flare in this cycle was an X6.9 on Aug. 9, 2011. This is the 7th X-class flare in 2012 with the largest being an X5.4 flare on March 7.
This flare did not have an associated Earth-directed coronal mass ejection (CME), another solar phenomenon that can send solar particles into space and affect electronic systems in satellites and on Earth.
Updates will be provided as needed. [/quote]
[url=http://www.universetoday.com/98149/][size=110][b][i]Disco Sun: X-Class Flare Creates Strobe-Light Effect[/i][/b][/size][/url]
Universe Today | Nancy Atkinson | 2012 Oct 23
[url=http://blogs.discovermagazine.com/badastronomy/2012/10/23/oh-snap-another-x-class-flare-from-the-sun/][size=110][b][i]Oh, snap! Another X-class flare from the Sun[/i][/b][/size][/url]
Discover Blogs | Bad Astronomy | 2012 Oct 23
[url=http://asterisk.apod.com/viewtopic.php?f=29&t=29824][size=85][b][i]<< Previous SDO[/i][/b][/size][/url]