{"created":"2023-06-20T15:02:52.041308+00:00","id":31954,"links":{},"metadata":{"_buckets":{"deposit":"212e6aa5-0654-458a-8d69-ef3a0e4f4c84"},"_deposit":{"created_by":1,"id":"31954","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"31954"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00031954","sets":["1887:1890","1896:1898:1899:1910"]},"author_link":["406791","406792"],"item_9_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"The Hydrogen and Helium Ultraviolet Glow as an Origin of the Nighttime Ionosphere"}]},"item_9_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1967-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1_A","bibliographicPageEnd":"36","bibliographicPageStart":"17","bibliographicVolumeNumber":"3","bibliographic_titles":[{"bibliographic_title":"東京大学宇宙航空研究所報告"}]}]},"item_9_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"高度80-200km領域の夜間電離層における電離源としての水素およびヘリウムの紫外大気光について考察した.水素原子1026Å(L_β),ヘリウム原子584Å,ヘリウム・イオン304Å(L_α)の三つの輝線について,これらが地球コロナに起因するものとして,その強度を推定し,同時に観測による水素原子1216A(Z'α)線強度を用いて電離生成率を計算した.電子およびイオン密度が昼間から夜間にかけて減少する過程を各高度レベルで計算し,あわせて夜間の平衡密度を計算した.もし,1216Åおよび1026Åの強度がおのおの4kR(=4×10^9 photons/cm^2/sec),10R(10^7 photons/cm^2/sec)であれば,夜間でも高度90-150kmで10^3cm^<-3>以上の電子密度が保たれ,最大平衡電子密度は105kmで2.5×10^3cm^<-3>となる.1216Åふく射の酸化窒素の電離過程は高度100km以下で有効であるが,100km以上では1026Åふく射の方が電離源として重要であることが結論される.また584Åおよび304Åふく射は,その強度がおのおの10R,1R程度でもO^+,O_2^+,N_2^+の生成に有効である.最後に理論計算の結果と観測結果を比較し,平均の夜間電離層の状態をよく説明できることを示す.","subitem_description_type":"Abstract"}]},"item_9_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"The hydrogen and helium ultraviolet glow in the night sky are considered as a source of the electrons and ions in the nighttime ionosphere between 80 and 200 km. The intensities of HI 1026Å(Lβ), He I 584Å and He II 304Å(Lα) emissions at night are estimated with an assumption that they originate in the geocorona. They, with the observed intensity of HI 1216Å(Lα) glow, are used to evaluate the ionization rate at night. Equilibrium values of electron and ion densities are obtained. The decay of the charge densities in the transient time between day and night are numerically calculated at different altitudes. The charge density in 90 through 150 km is found to be maintained above 10^3cm^<-3> all through the night. The maximal electron density is approximately 2.5×10^3cm^<-3> at 105 km, if the intensities of the 1216Å and 1026Å glow are assumed to be 4 kR and 10 R respectively. It is concluded that currently believed role of the 1216Å glow for the ionzation of nitric oxide is important only below the 100 km level while the 1026Å glow becomes an important ion source in the altitudes above 100 km. The 584Å and 304Å glow may contribute appreciably to the production of O^+, O^+_2 and N^+_2 above 150 km, even though their brightnesses are as small as 10 R and 1 R respectively. The present results are shown to be in fundamental agreement with the average feature of nighttime ionosphere ever been observed.","subitem_description_type":"Other"}]},"item_9_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: SA0125029000","subitem_description_type":"Other"}]},"item_9_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学宇宙航空研究所"}]},"item_9_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0563-8100","subitem_source_identifier_type":"ISSN"}]},"item_9_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00161914","subitem_source_identifier_type":"NCID"}]},"item_9_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"東大理・付属地球物理研究施設"},{"subitem_text_value":"東大理・地球物理学教室"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"等松, 隆夫"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"小川, 利紘"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-01-24"}],"displaytype":"detail","filename":"SA0125029.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"SA0125029.pdf","url":"https://jaxa.repo.nii.ac.jp/record/31954/files/SA0125029.pdf"},"version_id":"3056c07a-7890-4af9-8db0-55108797a593"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"極端紫外大気光による夜間電離層の生成","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"極端紫外大気光による夜間電離層の生成"}]},"item_type_id":"9","owner":"1","path":["1890","1910"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"31954","relation_version_is_last":true,"title":["極端紫外大気光による夜間電離層の生成"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-21T00:45:26.028955+00:00"}