Aurora Hiss - Aurora Hiss

Japanese: オーロラ・ヒス - おーろらひす
Aurora Hiss - Aurora Hiss

...the aurora is a magnetic field that is generated by the magnetic field of the atmosphere.
[Various phenomena related to the aurora]
During curtain aurora activity, radio noise called auroral hiss is generally received on the ground. The same type of radio waves are also observed by extraterrestrial satellites (auroral kilometer waves, saucer waves, etc.), and when viewed from the Earth, it can be seen that radio waves are emitted like a radio star in conjunction with auroral activity.

From [Magnetosphere Plasma Waves]

...When the received whistler waves are converted into sound and listened to, they start out high-pitched and sound like a whistling sound, hence the name whistler. Whistler mode waves occur naturally in the magnetosphere as well as in lightning discharges, and VLF emissions such as auroral hiss generated by auroral electrons and chorus generated by high-speed electron flow near the magnetospheric equator are also whistler wave phenomena (auroras). In the 1970s, satellite observations discovered new propagating waves associated with auroral activity. ...

*Some of the terminology that mentions "Aurora Hiss" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このような発達に際してオーロラ中やその近傍の電離圏には強い西向きの電流が流れて磁場を乱し,極磁気あらしの原因となる。
[オーロラに関連する諸現象]
 カーテン型オーロラの活動時には一般に地上ではオーロラ・ヒスと呼ばれる雑音性の電波が受信される。同種の電波は地球外の人工衛星でも観測され(オーロラ・キロメートル波,ソーサー波など),外から地球を見るとオーロラ活動に伴って電波星のように電波を放出していることがわかる。…

【磁気圏プラズマ波動】より

…受信したホイッスラー波を音に変換して聞くと,初めは音が高く,口笛を吹くように聞こえることからホイッスラーといわれている。ホイッスラーモードの波は,雷放電のほか磁気圏で自然発生しており,オーロラ電子から発生するオーロラ・ヒスや磁気圏赤道付近で高速電子流により生ずるコーラスなどのVLF放射もホイッスラー波動現象である(オーロラ)。 1970年代になって,衛星観測によってオーロラ活動と関連した新しい伝搬性の波が発見された。…

※「オーロラ・ヒス」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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