The Sun has been in a bit of a mood lately, spitting out some pretty big flares (including the second largest one of the current magnetic cycle). Alan Friedman, one of my favorite astrophotographers, caught the culprit sunspot, Active Region 1429, as it was nearing the edge of the Sun on Monday:
Doesn’t look like your normal shot of the Sun, does it? [Click to ensolarnate.]
Alan uses an Hα filter, which cuts out almost all the light from the Sun except for a narrow slice of color emitted by warm hydrogen. This reduces the glare hugely, and reveals delicate structures in the Sun’s plasma. He then inverts the image, so bright things appear dark, and vice-versa. That’s an old astronomer’s trick that makes fainter things easier to see. He also used a false color palette to make it appear reddish. That’s actually a good idea, since the color of light emitted by the hydrogen is at 6563 Angstroms, right in the middle of the red part of the spectrum!
In this case, doing all this makes the Sun look like a 1970s shag rug. It’s a technique he uses to great effect. Just click on the Related Posts links below to see how!
Andf you’re wondering what the whole Sun looked like instead of just this closeup, then feast your eyes on this:
Yegads [click to embiggen]. Magnificent. Note all the prominences — giant towers of gas at the edge of the Sun — and the simply enormous filament of plasma at the top of the Sun’s disk. It’s about 400,000 km (240,000 miles) across: the distance from the Earth to the Moon!
Holy solar phenomena.
I’ll add that Mexican astrophotographer CÃ©sar CantÃº also took a nice image of the active region, and caught a loop of material arcing from one spot to another (marked with arrows):
And obviously, both Alan and CÃ©sar do a far better job of taking pictures of the Sun than I do.
Links to this Post
- The beautiful surface of the Sun | HEY LAURENT VOANH IS HERE | March 15, 2012
- The Sun's Angry - I don't feel 50 Forums | March 16, 2012
- There’s a little red spot on the sun today. « Communion Of Dreams | March 16, 2012
- Images of the Sun | Rocket Ship Pajamas | March 16, 2012
- Chroniques pornographiques, rebelles et pixellisÃ©es. « Chroniques (SEb) | March 16, 2012
- Extremely Weird Picture of the Sun | Lost & Found Pictures, LLC | March 16, 2012
- March 17 – Not So Much Hum : What a Week! | March 17, 2012
- The Sunâ€™s Angry Red Spot | The Big Picture | March 20, 2012