Morning Glow - Asayake

Japanese: 朝焼け - あさやけ
Morning Glow - Asayake

Around sunrise, the eastern sky takes on a different color than it does during the day. The short-wavelength blue portion of sunlight is scattered by air molecules and dust as it passes through the atmosphere. Meanwhile, the long-wavelength red portion travels straight ahead without being scattered much. When the sun is close to the horizon, the sun's light passes through a thick layer of the atmosphere, and much of the blue portion is lost through scattering, while on the ground the red portion is particularly strong, causing the sky to take on a different color than the familiar daytime blue sky. The color is not simple, and varies depending on the atmospheric conditions on the day.

[Kazuo Hiratsuka]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

日の出のころ、東の空が昼間とは異なる色彩に色づく現象。太陽光線のなかの波長の短い青色系の部分は、大気中を進むときに空気の分子やちりによって散乱される。一方、波長の長い赤色系の部分は、あまり散乱されずに直進する。太陽が地平線に近いときには、太陽の光は厚い大気層を通過することとなり、青色系の部分は散乱によって多く失われ、地上では赤色系の部分がとくに強く目に入るので、見慣れた昼の青空とは異なる色彩に空が染まることになる。その色彩は単純でなく、当日の大気の状態によって異なる。

[平塚和夫]

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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