... In a broad sense, auroras can be broadly divided into three types: (1) Polar cap glow aurora: A very faint, vague, shapeless light that appears in the Earth's polar cap regions (regions at higher latitudes than the polar light zone) prior to a magnetic storm. It is characterized by stronger Hα (red) and Hβ (blue) light emitted by hydrogen than other auroras. (2) Polar zone aurora: An aurora unique to the polar light zone (an area that passes through Alaska, Canada, southern Greenland, and the ocean off the coast of Siberia in the Northern Hemisphere), with strong red, green, blue, pink, or red-purple light emitted by oxygen and nitrogen molecules and atoms. ... *Some of the terminology used to refer to the "polar glow aurora" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 広い意味でのオーロラは次の三つに大別される。(1)極冠グローオーロラ 磁気あらしに先立って地球の極冠地方(極光帯より高緯度の地方)に現れる,ごく薄いぼんやりした不定形の光で,水素の放出するHα線(赤),Hβ線(青)などの光が他のオーロラに比べて強いのが特徴である。(2)極光帯型オーロラ 極光帯(北半球ではアラスカ,カナダ,グリーンランド南部,シベリア沖の海上などを通る領域)に特有のオーロラで,酸素や窒素の分子,原子などが発する赤,緑,青,ピンクあるいは赤紫などの光が強い。… ※「極冠グローオーロラ」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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