...The cause is thought to be the heating of the polar upper atmosphere by the precipitation of particles into the auroral zone and the strong ionospheric currents in the auroral zone, which causes large-scale atmospheric movements and changes in the composition of the neutral atmosphere over a wide area. As a result of F-region storms, radio waves used for long-distance wireless communication penetrate the ionosphere and cannot reach the receiving point, causing communication to be cut off. With international cooperation, ionospheric storms caused by the sun are predicted and wireless communication users are warned in advance; this is called a radio warning. ... *Some of the terminology that refers to "F area storm" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この原因は,オーロラ帯への粒子の降り込みとオーロラ帯の強い電離圏電流によって,極域超高層大気が加熱されて大規模な大気運動が起こり,中性大気の組成が広い範囲で変化することによると考えられている。F領域あらしの結果,遠距離無線通信に使用されていた電波が電離層を突き抜けてしまい,受信点に電波が到達しなくなるため通信が途絶する。国際協力のもとに太陽に起因する電離圏あらしを予知し,無線通信利用者にあらかじめ警告するようにしており,これを電波警報という。… ※「F 領域あらし」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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