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.
NASA made us another gift...im sure some of you noticed it.
They added a colored magnetogram
This is absolut great its much easier now to check the spots and their magnetic structure.
Will add this !!!