{"created":"2023-07-25T11:09:30.054611+00:00","id":13544,"links":{},"metadata":{"_buckets":{"deposit":"2e45a846-104c-4149-a4f7-7c8ae8d7286d"},"_deposit":{"created_by":36,"id":"13544","owners":[36],"pid":{"revision_id":0,"type":"depid","value":"13544"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00013544","sets":[]},"author_link":["42589","42588","42586","42591","42585","42590","42583","42587","42584"],"item_10001_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2016-09","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"191","bibliographicPageStart":"183","bibliographicVolumeNumber":"10","bibliographic_titles":[{},{"bibliographic_title":"Polar Science","bibliographic_titleLang":"en"}]}]},"item_10001_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"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.","subitem_description_type":"Abstract"}]},"item_10001_description_6":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"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。","subitem_description_type":"Other"}]},"item_10001_relation_14":{"attribute_name":"DOI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"10.1016/j.polar.2016.03.005"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"http://dx.doi.org/10.1016/j.polar.2016.03.005","subitem_relation_type_select":"DOI"}}]},"item_10001_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"18739652","subitem_source_identifier_type":"ISSN"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Fukuda, Yoko","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42583","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kataoka, Ryuho","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42584","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Miyoshi, Yoshizumi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42585","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Katoh, Yuto","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42586","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nishiyama, Takanori","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42587","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Shiokawa, Kazuo","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42588","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Ebihara, Yusuke","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42589","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Hampton, Donald","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42590","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Iwagami, Naomoto","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"42591","nameIdentifierScheme":"WEKO"}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Pulsating aurora","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Wave-particle interactions","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"High-speed imaging","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"Quasi-periodic rapid motion of pulsating auroras","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Quasi-periodic rapid motion of pulsating auroras"},{"subitem_title":"Quasi-periodic rapid motion of pulsating auroras","subitem_title_language":"en"}]},"item_type_id":"10001","owner":"36","path":["1725"],"pubdate":{"attribute_name":"公開日","attribute_value":"2016-10-07"},"publish_date":"2016-10-07","publish_status":"0","recid":"13544","relation_version_is_last":true,"title":["Quasi-periodic rapid motion of pulsating auroras"],"weko_creator_id":"36","weko_shared_id":-1},"updated":"2023-07-25T15:47:56.122632+00:00"}