Tomorrow (January 4) at 8 pm EST the Earth will be at perihelion. This is the point in our orbit around the Sun that is closest to the Sun. Why do we care?
Here is a comparison of HMI Quick-Look continuum images from January and July:
Click on it!
The two horizontal lines show how high the Sun appears today. When those lines are extended to the left, the July image is a little over 3% smaller. When we designed the instruments on SDO we had to make sure the largest appearance of the Sun would fit on the CCDs.
http://sdo.gsfc.nasa.gov/
NASA made us another gift...im sure some of you noticed it.
They added a colored magnetogram
http://sdo.gsfc.nasa.gov/assets/img/latest/latest_1024_HMIBC.jpg
This is absolut great its much easier now to check the spots and their magnetic structure.
Will add this !!!
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