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Quasi-periodic rapid motion of pulsating auroras
https://nipr.repo.nii.ac.jp/records/13544
https://nipr.repo.nii.ac.jp/records/13544cd85305c-fb94-4e50-9043-a621d6e8723f
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2016-10-07 | |||||
タイトル | ||||||
タイトル | Quasi-periodic rapid motion of pulsating auroras | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Quasi-periodic rapid motion of pulsating auroras | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Pulsating aurora | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Wave-particle interactions | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | High-speed imaging | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Fukuda, Yoko
× Fukuda, Yoko× Kataoka, Ryuho× Miyoshi, Yoshizumi× Katoh, Yuto× Nishiyama, Takanori× Shiokawa, Kazuo× Ebihara, Yusuke× Hampton, Donald× Iwagami, Naomoto |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We report rapid motion of pulsating auroras associated with so called 3 ± 1 Hz modulations embedded in the main pulsations. During the pulsation ON phase, repetitive expansions are often observed around the edges of pulsating patches. Some events show a few detached expansions traveling away from the main deformed pulsating patch. Approximately 80% of all expansion speeds were found to be less than 70 km s−1 at ionospheric altitudes, which is less than the projected Alfvén speed from the magnetospheric equator to the ionosphere. The rapid motions with speeds of tens of km s−1 are unlikely to be explained by obliquely propagating chorus elements, which are known to cause the 3 ± 1 Hz modulation, because the perpendicular speed of the oblique chorus waves is higher than the Alfvén speed. We discuss the slow-mode Alfvén wave as a candidate modulation source to generate the rapid motions. A few non-repetitive expansion events with a speed of more than 150 km s−1 also appear at the onset of the ON phase. These non-repetitive expanding motions are characterized by a long displacement compared to the repetitive expanding motions. The differences in the expansion speeds indicate different formation mechanisms of the patch motions. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 秒単位で発光強度が変化する脈動オーロラには、数Hzの強度変化が伴うことが知られている。高速カメラを用いることで、その数Hzの強度変化に対応したオーロラ形状の高速変化を多数確認することができた。本研究では、その空間変化のスピードは電離圏高度で70 km s−1以下となる例が大半であり、典型的な磁気赤道面でのアルベンスピードよりも遅いという事を明らかにした。より高速な空間変化が期待されるコーラス波動との対応では説明できないため、スローモードのアルベン波が原因である可能性を新たに提唱した。また、電離圏高度で150 km s−1以上の高速変化も発見されたが、単発的で比較的長距離移動する特徴を持っており、数10 km s−1の変化とは異なる形成メカニズムを持つと考えられる。 | |||||
書誌情報 |
en : Polar Science 巻 10, 号 3, p. 183-191, 発行日 2016-09 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://dx.doi.org/10.1016/j.polar.2016.03.005 | |||||
関連名称 | 10.1016/j.polar.2016.03.005 |