Polar cap - Kyokkan

Japanese: 極冠 - キョッカン
Polar cap - Kyokkan
1. The regions of the Earth's poles above 60 degrees latitude. In the field of geomagnetism, it also refers to the region inside the auroral zone, between 65 and 70 degrees latitude.
2. White areas seen in the polar regions of Mars. They almost disappear in the Martian summer and spread in the winter. They are dry ice made of frozen carbon dioxide, and it is thought that water ice exists underneath.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:
地球の両極地方の緯度60度より高緯度の領域。また地球電磁気学の分野では、極光帯よりも内側の緯度65度~70度以上の領域を指す。
火星の両極地方に認められる白い部分。火星の夏にはほとんど消失し、冬に広がる。二酸化炭素が氷結したドライアイスであり、その下に水の氷が存在すると考えられる。

出典 小学館デジタル大辞泉について 情報 | 凡例

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