The first 100,000,000 on-orbit NASA SDO Images... AIA enables us to observe the corona at high resolution and at multiple colors, which represent temperatures of the glowing gas in the corona: in the image on the top, blue is about 1 million degrees, green about 1.5 million, an red is 2 million degrees or even more (which means all temperatures occur along a line of sight, with different temperatures at different depths in the corona). But AIA is also very precise, and thus very sensitive to small changes: in the image on the bottom, we removed everything that was not changing from one exposure to the next, showing only where the ongoing solar flare and coronal mass ejection (explosion) deformed the coronal gas anf magnetic field. In the case of this eruption (on 7 March 2012, around 01:06 UT) we see that the eruption affects over half the Sun (with a diameter of almost a million miles), and reaches into the corona up the the very edges of AIAs field of view. These deformations, including many wave phenomena, tell us more about the Suns ever-changing corona. credit: NASA Solar Dynamics Observatory (Little SDO)
Posted on: Mon, 26 Jan 2015 15:11:45 +0000
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