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運営者ブログ - 天王星で嵐が頻発

天王星で嵐が頻発

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admin_mb 2014-11-17 22:54
天王星で嵐が頻発

天王星は木星や土星のようなガス惑星です。2014年8月に、この天王星の北半球の大気の上層部において、観測史上最も明るい雲の活動が観測されたのですが、この原因が解明できていないとのこと。この雲の活動範囲は9000キロもの広さで、地球の直径の3/4に相当します。天王星の直径は地球の約4倍ですが、この雲の明るさは天王星全体の反射光の30%にも達するそうです。

これまで、この明るい雲の嵐は太陽光に起因するものと考えられており、天王星が春分を向かえ赤道方向に太陽光が当たる頃に発生すると考えられていたそうです。地球からは30億キロの距離に位置する天王星の公転周期は約84年ですので、約42年毎に春分、秋分を迎えることになります。天王星の大気活動のピークは2007年と想定されていたそうで、本来なら減少すると考えられていた期間に発生していることになります。天王星の気象は10年以上にわたり観測されており、嵐を発生させるような熱源は惑星内には存在しないと考えられていることから、太陽光が原因と考えられていましたがそうではないようです。
地球でも何年に1回という気象現象もありますから天王星も同じでしょう。さすがに10年の観測ではまだまだわからないところもあるのでしょうね。

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