Sunny Sunday

RARE BLUE AURORAS: Northern Lights are usually green, and sometimes red. Those are the colors produced by oxygen when it is excited by electrons raining down from space. On April 22nd, Didier Lindsey of Fox, Alaska, witnessed an apparition of aurora-blue:


Hours before he took the picture, a CME struck Earth’s magnetic field, igniting a G2-class geomagnetic storm. “The sky filled with very active auroras,” Lindsey says,”including these rare blues.”

In auroras, blue is a sign of nitrogen. Energetic particles striking ionized molecular nitrogen (N2+) at very high altitudes produces a cold azure glow of the type captured in Lindsey’s photo. Why it rivaled the usual hues of oxygen on April 22nd is unknown. Auroras still have the capacity to surprise.

Any auroras tonight, blue or otherwise, would be a surprise. Geomagnetic conditions are quiet as the solar wind relaxes into a steady breeze of low-speed plasma. NOAA forecasters estimate a scant 10% chance of polar geomagnetic storms on April 29th.



About Den

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

  1. Den says:

    Sunday morning greetings to all, stay away from the TeeVee, nothing but rich boys’ BS, made it 100 days without being shot by a disgruntled individual, that’s an accomplishment.


  2. David B. Benson says:

    TVD bridge, then up and over the bridge to view the results of last year’s construction of Maxwell Drive taking off there. Return the same way for a total of 68 minutes. A few of the usual birds but no pollinators and no rabbits.


  3. David B. Benson says:

    I guess the world has not come to an end.



  4. David B. Benson says:

    Had a pleasant supper talking with Elizabeth who is busy studying for her E&M final tomorrow morning along with a cello final tomorrow afternoon.


  5. Den says:

    I finished the kitchen counter back splash install, then went outside and put mulch in the Oleanders snazzy new border area I made for them yesterday.

    Then said fuckit and went for a ride for about 85 miles.


  6. Den says:

    Time to punch out and go home:


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