By Bill Kirk
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The false-color image was taken by the Solar and Heliospheric Observatory (SOHO) orbiting spacecraft. SOHO/ESA/NASA 41 The Sun, Stars, and Galaxies Geomagnetic Storms The Sun’s violent eruptions have concrete effects on Earth. Large solar flares and coronal mass ejections shower Earth with streams of high-energy particles that can cause geomagnetic storms. These storms can disrupt communications satellites and radio transmissions and cause surges in power transmission lines. They also create auroras (the northern and southern lights) near the poles.
The corona’s density is so low—the particles of matter are spread out so widely—that the corona does not actually produce much heat. A meteor traveling through the corona does not burn up, as commonly happens in Earth’s much cooler but much denser atmosphere. Although the corona is relatively faint in visible light, it strongly emits radiation at extreme ultraviolet and X-ray wavelengths. However, areas of the corona periodically appear dark at those wavelengths. The corona is extremely thin in these dark areas, called coronal holes.
NASA/Tod Strohmayer (GSFC)/ Dana Berry (Chandra X-Ray Observatory) other star (or that a large planet is orbiting it). A wavy path of a star against the background of other stars can indicate the same thing. Periodic dips in the brightness of a star can suggest that another star is passing in front of it and then behind it. Detailed studies of such “eclipsing binaries” can yield information about the sizes, brightness, and shapes of both stars.