关于这张图
Several small sunspots appeared this week, giving NASA Solar Dynamics Observatory a chance to illustrate their sources Mar. 2, 2017. The first image is a magnetogram or magnetic image of the sun's surface. The MDI instrument can observe where positive and negative particles are moving toward or away from strong magnetic areas. These active regions have stronger magnetic fields and appear as strongly black or white. The yellow image shows the surface in filtered light, and there the same active regions appear as dark, cooler splotches called sunspots. Higher up in the sun's atmosphere, the gold…
