August 20, 2010

This just in from one of my favorite sites, A coronal hole on the sun is turning to face Earth. Coronal holes are places in the sun’s atmosphere where the magnetic field opens up and allows solar wind to escape. Here is a magnetic map of the hole from NASA’s Solar Dynamics Observatory:

  photo coronal hole


The magnetic field lines are color-coded in this very cool image. White lines are closed; they are holding the solar wind in. Golden lines are open; they allow the solar wind out. A stream of solar wind flowing from this coronal hole is expected to reach Earth on or about August 24th.

 People in high latitudes (closer to the poles) have a chance of seeing auroras (also known as northern lights) this week, so keep your eyes peeled!


Image: Karel Schrijver, Lockheed Martin SAL

Posted by: Liz Nealon

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