Equinox Sunday

THE SOLAR WIND IS COMING: hole in the sun’s atmosphere is facing Earth and spewing a stream of solar wind in our direction. Estimated time of arrival: Sept. 23rd. Arriving on the first day of northern autumn, the gaseous material could spark a nice display of equinox auroras around the Arctic Circle. Aurora alerts: SMS Text.

EQUINOX AURORAS: Auroras love equinoxes. At this time of year even a gentle gust of solar wind can spark bright auroras around the Arctic Circle. Petra Schneider sends this example of the phenomenon from Hamarøy, Norway:

No geomagnetic storm was in progress on Sept. 21st when Schneider took the picture. Instead, a minor solar wind stream was brushing against Earth’s magnetic field–barely elevating the background density and speed of gaseous material flowing around our planet.

What happened? It’s called the “Russell-McPherron effect.”  During weeks around equinoxes, cracks open in Earth’s magnetic field, allowing solar wind to enter and ignite Arctic auroras. This effect will continue in the nights ahead as the autumnal equinox approaches and the solar wind continues to blow. Happy Equinox!

About Den

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

  1. Den says:

    DWF wishes to extend our condolences to the family of Erling Krange.
    He was a welcome guest here on many occasions and we will miss him.
    Min dypeste medfølelse for ditt tap.

    Like

  2. David B. Benson says:

    The equinox is not the beginning of autumn. The meteorologists take the season to be the three months September, October and November. Locally it still feels like late summer, a result of global warming.

    Like

  3. David B. Benson says:

    A slow 17 minutes to the north door of the Hillside Cafe. Thai shrimp don’t come pre-spiced from Thailand.

    Like

  4. Den says:

    Sorry Fred, she got tired of waiting and went to bed without you.

    Like

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