Planetary Sunday

PLANET AIRGLOW: Jeff Dai was camping in the Himalayas on Nov. 18th when he photographed a green light in the sky. But it was not the aurora borealis. “It was airglow,” says Dai, who wrapped his photos of the display into a ‘little planet’:


“This is a 360-degree stereographic projection showing our camp site in Tibet,” says Dai. “In places like this, far from urban lights, the sky is filled with wonders.”

Although airglow looks like the aurora borealis, it is not. Auroras are caused by gusts of solar wind. Airglow is caused by chemi-luminescent reactions in Earth’s upper atmosphere. These reactions get started during daylight hours when the atmosphere is bathed in strong UV radiation from the sun. At night we see the afterglow, colored green by oxygen atoms 90-100 km high or sometimes red by hydroxyl ions 86-87 km high.

“Also unlike auroras, airglow is visible all over the globe,” adds Dai. “Though brightest 10-15 degrees above the horizon it fills the sky and may be photographed from dark-sky sites everywhere.”



About Den

Always in search of interesting things to post. Armed with knowledge and dangerous with the ladies.
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16 Responses to Planetary Sunday

  1. Den says:

    A dirtball in the Universe that glows in the dark, must be all those atomic tests.


  2. David B. Benson says:

    That’s neat!


  3. º¿carol says:

    Sorry to read about your foot the other day. I have a new pain just below my ankle, it’s not going away. Doctor appointment Wednesday to see what the deal is. If it’s arthritis, I learn to live with it. If it’s fixable, well then…we’ll see.


  4. º¿carol says:

    Ran over my allotted gigs a couple days ago. 😦 My account in “data restriction.” Pain in the ass.

    At least this time I only had two days left until the new billing period which starts tonight at midnight.

    Still eating turkey over here and I love it. Just had a turkey sandwich with an inch of Mayonnaise on it. Mmmm.

    Will have to start cooking again tomorrow. *sigh* I better get some hamburger out tonight, get it thawing.

    Sun actually came out today! It’s been awhile. My solar lights around the house got a charge out of it, lol. Not enough, I’m sure. By the time I do out around 8:30 they are already out for the night.


  5. º¿carol says:

    I’m happy you found Erling on FB, Den. He actually shared something I posted on his page. And it’s fun, looking at what he posts and hitting the “translation” button to see what his fellow Norwegians say.

    Well, off to FB. Haven’t checked the news feed yet today although I did write up a few newsy items for my friends to read. Time to go see what they’ve had to say since last night.


  6. David B. Benson says:

    WordPress doesn’t keep older comments.


  7. David B. Benson says:

    Like last Sunday, clockwise to the Birch & Barley in 108 minutes. Breezy but no rain. Chilled a bit. The swamp above Lac du Puddle was converted into a series of 5 ponds. There were 3 Mallards dabbling in one of those, 2 drakes and a duck. I suppose it is the same 3 from prior years. Also, later, a Swainson’s hawk and still later a kestrel.


  8. Den says:

    There is not enough ‘puddles’ around here, dry country, some reservoirs, my old place had a pond view, all kinds of waterfowl there, even ducks.

    I miss that view just don’t miss the major road 50 feet away from my house roaring with racket, the critters did not seem to notice.


  9. David B. Benson says:

    How rapidly is The Donald going to self-distruct?


  10. Den says:

    An optical delusion:


  11. David B. Benson says:

    Snow, finally.


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