A faint reddish-brown ring that appears around the Sun in a clear sky. Around noon, the inner radius of the ring is about 10° and the outer radius is about 20°, but when the sun is low in the sky, the ring becomes larger. The Bishop Ring was first seen after the great eruption of the Krakatoa volcano in Indonesia in 1883, and was visible around the world until 1886. In recent years, it was observed after the eruption of Mount Pinatubo in the Philippines in 1991. It is named after Reverend Bishop, who first observed it in Hawaii. It is caused by diffraction caused by fine dust particles in the upper atmosphere, and from its outer radius, the average diameter of the fine dust particles is estimated to be 0.00185 mm. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
晴れた空に太陽のまわりに現れる赤褐色のぼんやりした環。昼頃では,環の内径は約 10°,外径は約 20°であるが,太陽高度が低いときの環はもっと大きくなる。ビショップ環が最初に見られたのは,1883年のインドネシアのクラカトア火山の大爆発のあとで,世界各地で 1886年まで見ることができた。近年では 1991年のフィリピンのピナツボ山噴火後に観測された。名前はハワイで最初に観測したビショップ牧師にちなむ。高層大気中の微細な塵による回折現象によるものであり,その外径から,細塵の直径の平均は 0.00185mmと見積もられている。
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