A new set of solar fireworks

Oct 22, 2012 by Karen C. Fox
NASA's Solar Dynamics Observatory (SDO) captured this image of an M9-class flare on Oct 20, 2012 at 2:14 p.m. EDT. This image shows light at a wavelength of 131 Angstroms, which corresponds to material at 10 million Kelvin, and is a good wavelength for observing flares. This wavelength is typically colorized as teal, as shown here. Credit: NASA/SDO

The sun emitted a significant solar flare, peaking at 2:14 p.m. EDT on Oct. 20, 2012. This flare is classified as an M9 flare. M-class flares are the weakest flares that can still cause some space weather effects near Earth. Since flares are rated on a scale from 1 to 10, an M9 is a particularly strong M class flare, but still ten times weaker than the most powerful flares, which are labeled X-class.

The flare appeared on the left limb of the sun, from a region that is just rotating into Earth's view.

are gigantic bursts of radiation. The 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 disrupts the for as long as the flare is ongoing, anywhere from minutes to hours.

The National Oceanic and Atmospheric Association, which is the United States government's official source for space weather forecasts, categorized the radio blackout associated with this flare as an R2, 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.

Updates will be provided if needed.

Explore further: SDO captures images of two mid-level flares

More information: What is a solar flare? For answers to this and other space weather questions, please visit the Spaceweather Frequently Asked Questions page.

add to favorites email to friend print save as pdf

Related Stories

NASA sees Sun send out mid-level solar flare

Jul 19, 2012

The sun emitted a mid-level solar flare on July 19, 2012, beginning at 1:13 AM EDT and peaking at 1:58 AM. Solar flares are gigantic bursts of radiation that cannot pass through Earth's atmosphere to harm ...

Emerging sunspot releases mid-level solar flare

Aug 20, 2012

(Phys.org) -- On August 17, the sun emitted a mid-level flare, peaking at 9:02 PM EDT. Solar flares are gigantic bursts of radiation that cannot pass through Earth's atmosphere to harm humans on the ground, ...

Another M-class flare from Sunspot 1515

Jul 05, 2012

Active Region 1515 has now spit out 12 M-class flares since July 3. Early in the morning of July 5, 2012 there was an M6.1 flare. It peaked at 7:44 AM EDT. This caused a moderate – classified as R2 on ...

Space Image: Sunspots and solar flares

Mar 21, 2012

(PhysOrg.com) -- NASA's Solar Dynamics Observatory (SDO) captured this image of an M7.9 class flare on March 13, 2012 at 1:29 p.m. EDT. It is shown here in the 131 Angstrom wavelength, a wavelength particularly ...

Solar flares: What does it take to be X-class?

Aug 10, 2011

Solar flares are giant explosions on the sun that send energy, light and high speed particles into space. These flares are often associated with solar magnetic storms known as coronal mass ejections (CMEs). ...

Recommended for you

SDO captures images of two mid-level flares

Dec 19, 2014

The sun emitted a mid-level flare on Dec. 18, 2014, at 4:58 p.m. EST. NASA's Solar Dynamics Observatory, which watches the sun constantly, captured an image of the event. Solar flares are powerful bursts ...

Why is Venus so horrible?

Dec 19, 2014

Venus sucks. Seriously, it's the worst. The global temperature is as hot as an oven, the atmospheric pressure is 90 times Earth, and it rains sulfuric acid. Every part of the surface of Venus would kill you ...

Image: Christmas wrapping the Sentinel-3A antenna

Dec 19, 2014

The moment a team of technicians, gowned like hospital surgeons, wraps the Sentinel-3A radar altimeter in multilayer insulation to protect it from the temperature extremes found in Earth orbit.

Video: Flying over Becquerel

Dec 19, 2014

This latest release from the camera on ESA's Mars Express is a simulated flight over the Becquerel crater, showing large-scale deposits of sedimentary material.

Spinning up a dust devil on Mars

Dec 19, 2014

Spinning up a dust devil in the thin air of Mars requires a stronger updraft than is needed to create a similar vortex on Earth, according to research at The University of Alabama in Huntsville (UAH).

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

vidyunmaya
1 / 5 (1) Oct 22, 2012
You have very good data and it should be supported in time by Comprehension- modeling. The basic question remains -What drives the Sun?
Search Cosmology vedas Interlinks- Life support-Sensitive Index. Necessity to create Cosmology chairs when the subject needs attention.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.