Ultraviolet radiation swept Earth’s upper atmosphere on February 18, following an M1.9 class flare the preceding day. The flare came from new sunspot AR1675; it was the most intense flare of 2013 so far, although it did not produce a cornoal mass ejection.
Here it is, in a range of wavelengths:
Review: Marketing the Moon
Aerospace Safety Advisory Panel 2013 Annual Report
Space App to Support Humanitarian Organizations Presented at SGCongress 2013
IAA Conference: Gathering for Impact!
Art in a Fairing Vacuum Chamber Test
Solar Streams, Meteors, and Triple Conjunction Make for Lively Skies
Chris Hadfield Reflects on his ISS Mission
Air Force Chief of Safety Talks Space Situational Awareness at IAASS Conference
NASA Records Most Powerful Lunar Meteorite Impact 
A Week of Anniversaries
Complicated Sunspot Region Spews Year's Strongest Solar Flares, More ExpectedFinal Reflections from Space
Luca Parmitano Shows Off his Spacesuits
The Many Views of a Solar Eruption
On Fourth Try, Waverider Achieves Hypersonic Flight
Canada Unveils New Bill, Assisted by its Favorite Space Commander
The Day NASA's Fermi Dodged a 1.5-ton Bullet
SpaceIL: From Flight of Fancy to the Moon
IAASS Proposes Space Debris Removal Framework
Findings of the 6th European Conference on Space Debris
Further Adventures in Space with ISS Commander Chris Hadfield
Sun Spews Two Coronal Mass Ejections at Satellites as Sunspot Region Grows
IAASS Publishes New Text: Safety Design for Space Operations
NASA Prepares to Repair Spacecraft with 3D Printing
PulCheR - BioInspired Propulsion System by Italian Firm Alta
NASA's Asteroid Capturing Mission Concept
Yuri's Night Partiers Celebrate Space Around the Globe
European Commission Spreads Space Message with Comic Book
While NASA Cuts Back on Outreach, Crowdfunded Movie Picks Up the Challenge
SEXTANT: NASA's "Cosmic Beacon"
Installing the Alpha Magnetic Spectrometer
Seth Green Talks Microgravity on Conan
Xombie Makes Highest, Longest Flight
Tim Pickens on Watching Your Rocket Engine's First Test Flight
Dragon Returns to Earth
Meteor Startles Northeast United States
The ISS Image Frontier – “Making the Invisible Visible”
Riding Shotgun on Apollo 16 Lunar Rover
Aurorae Continue Following Coronal Mass Ejection
SpaceX: The First 11 Years
ISS Change of Command Passes Baton from Ford to Hadfield
GOCE Satellite Felt Tohoku Earthquake from Orbit
NASA Launches Trajectory Browser to Map Interplanetary Missions
Armadillo Aerospace Releases STIG Update
Solar Max Appears to Fizzle; Scientists Predict Double Peak
Third Radiation Belt Surprises RBSP Scientists
Debris Falls from Orbit, Slowly
Antares Hot Fire Successful, Prepares for Flight
Sunspot Delta Region Ripe for Eruptions
Wave of Ionization Sweeps Earth After Solar Flare
What Will Earth Do to Asteroid 2012 DA14?
Preparing for Life on the Moon
ISS: Is Somebody Singing?
Asteroid Mission OSIRIS-REx to Nail Down Yarkovsky Effect
Record Setting Asteroid 2012 DA14 to Safely Pass Earth
Crackling Sun Spits Out Coronal Mass Ejection
Challenger Astronaut's Brother Recalls Boundary-Breaking Childhood
Moonrush's Mining Economy Coming Closer to Reality
Sounding Rocket Telescope Zooms in on Solar Corona
Will Overview Effect Make Everyone a Better Person?
DARPA Shows Progress on Phoenix Satellite Scavenger
UrtheCast to Let Everyone See Earth from ISS
Mona Lisa Tests Laser Communications
Orbital Debris Management & Risk Mitigation Now Available
Exploring the Overview Effect
Apophis Passage Improves Forecasts
NASA X Dives into Inflatable Heat Shield
Quadrantids Meteor Shower Peaks Early January 3
Missed Times Square? Get Curiosity New Years Greeting from Home
Escaping an F-111 Fighter Jet
Astronaut Chris Hadfield Composes First Song on ISS
SpaceX Grasshopper Leaps with 2 Meter Cowboy
A Year in the Life of Tycho Deep Space-1
Christmas at SpaceX
The World Is Not Ending Yet, Says NASA
Astronaut Chris Hadfield on the Reliability of Soyuz
NASA Johnson Style Music Video Takes Science Message Viral
European Space Agency Files Patent for Debris Alert System
The Abandoned British Space Race
X-37B Takes Off on Third Flight
Video: Sample Analysis at Mars (SAM)
Meet ISS Expedition 34/35
Launch Escape System Installed on Soyuz TMA-02M
AEOLDOS - Aerodynamic End Of Life Deorbit System for CubeSats and Small Satellites
ISS Tour: Kitchen, Bedrooms, and the Latrine
Thanksgiving Feasting on Earth and Above
When the Space Shuttle Engined Out
Google Lunar X PRIZE Team Summit 2012
When Your Spacecraft Moves Without You
Solar Eclipse: Spectacular View and Better Solar Predictions
Photography in Space: Not Quite Like Earth
NASA Launches "Spot the Station," Telescope Not Required
Flight of a Grasshopper
Copenhagen Suborbitals and Exploring "Horrible Deaths"
Paintballs Win Move an Asteroid Competition
Documenting Life on Earth - in Outer Space
Spaceman Play Wraps Up One Woman's Trip to Mars
How We Nearly Lost Discovery: Returning to Flight After Columbia
Remembering Columbia
Learning from Columbia
Organizational Factors of the Columbia Disaster
The Columbia Disaster and Space Program Safety 
Columbia And The Day of Remembrance
Sixteen Minutes from Home
STS-107: Columbia's Lost Crew
Timeline of the Columbia Disaster
Columbia Disaster Recommended Reading
Columbia Disaster Creative Works
The Columbia Disaster In Perspective![A trajectory analysis that used a computational fluid dynamics approach to determine the likely position and velocity histories of the foam (Credits: NASA Ref [1] p61).](http://www.spacesafetymagazine.com/wp-content/uploads/2014/05/fluid-dynamics-trajectory-analysis-50x50.jpg)
Cause and Consequences of the Columbia Disaster
Lessons Learned from the Columbia Disaster
Impact of Columbia Disaster on US Aviation SafetyLiving with Columbia: Interview with Mike Cianilli
Remembering the Columbia Crew, One Day at a Time
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