What are the characteristics of aurora?

Aurora shows the characteristics of diversity and is regarded as one of the most beautiful wonders in nature. It is colorful, different in shape and beautiful. This is because the high-altitude gas is composed of many elements, and the colors of light emitted by gas bombardment of different elements are different, so the aurora appears colorful and varied. Sometimes it appears in a very short time, just like the fireworks of the festival flashed in the air and disappeared without a trace; Sometimes it can exist in the air for hours.

2. Time of appearance

Aurora is most likely to appear before the vernal equinox and autumnal equinox, and it appears more frequently in spring and autumn than in Xia Dong. In addition, when there are more sunspots, or the solar cycle is in the stage of increasing coronal mass ejection and increasing solar wind intensity, the frequency and brightness of aurora will also increase.

3. Region

Aurora mostly occurs in high latitudes, especially in polar regions, and rarely in middle and low latitudes, especially near the equator. This is because the plasma emitted by the sun can appear when it blows near the earth, and is influenced by the earth's magnetic field, and then enters the polar regions of the earth, and then bombards the upper atmosphere.