Whats the aurora Aurora is an atmospheric optical

What's the aurora? Aurora is an atmospheric optical phenomenon(大气光学现象）. The auroras appear over the high magnetic latitude area （高 磁纬地区）of the planet, which is a brilliant and colorful phenomenon.

How did the aurora come into being？ The aurora of the earth, from the earth's magnetosphere and the sun's high-energy charged particles (solar wind), makes the upper atmosphere molecules or atoms excited (or ionized). Auroras often appear in the sky near the geomagnetic regions of the earth. （地球的极光，来自地球磁层 和太阳的高能带电粒子流(太阳风)使高层大气分子或原子激发(或电离)而产生。 极光常常出现于纬度靠近地磁极地区上空。）

What's the shape of aurora? the arc shape（ 弧状） the ribbon shape （带状） tentiform （幕状） radial pattern （放射状）

When is the best time to watch the aurora？ The aurora occurs only in cold autumn nights and winter nights, where high latitudes have the chance to witness. And the best moment is between 10 pm and 2 am, sometimes lasting an hour or so.

Where is the best place to watch the aurora? 1. Fairbanks, Alaska, USA, 美国阿拉斯加费尔班克斯 2. Iceriver lake, Julin Salon, Iceland, 冰岛杰古沙龙湖 3. Yellowknife, Canada, 加拿大耶洛奈夫 4. Tromso, Norway，挪威特罗姆瑟 5. Abisko national park, Sweden, 瑞典阿比斯库国家公园 6. North Pole, 北极 7. Antarctica. 南极

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We must have a chance to watch the aurora!

Thank you！