{"created":"2023-07-27T06:50:18.911402+00:00","id":43048,"links":{},"metadata":{"_buckets":{"deposit":"8250892a-7315-4a2d-af0e-5903e6a4527e"},"_deposit":{"created_by":18,"id":"43048","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"43048"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00043048","sets":["2812:2813:2833"]},"author_link":["69253","69257"],"item_9_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2001-03","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"81p.","bibliographicVolumeNumber":"1999-2000","bibliographic_titles":[{"bibliographic_title":"平成12(2000)年度 科学研究費補助金 基盤研究(C) 研究成果報告書"},{"bibliographic_title":"2000 Fiscal Year Final Research Report","bibliographic_titleLang":"en"}]}]},"item_9_creator_33":{"attribute_name":"著者別表示","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{}],"nameIdentifiers":[{}]}]},"item_9_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"まず、雷放電により放射された電磁波(空電)を観測するための雷空電観測システムを設計・試作した。このシステムでは、空電の磁界水平2成分を直交2軸のループアンテナにより検出し、その波形をA/D変換(サンプリング周波数44kHz、16ビット)してPCに取り込む。取り込みは常時行われているが、ある閾値を超えるような強い空電パルスが観測されたときだけ、その前後1秒間の波形をハードディスクに保存するようになっている。この雷空電観測システムを金沢大学工学部屋上に設置し、2000年4月より雷空電の自動観測を24時間行っている。このシステムにより、多いときには1日数百〜数千の雷空電波形を記録することができている。\n一方で、1つの雷空電の磁界波形に含まれる複数のパルス列を解析することで、1地点での空電観測データを用いた落雷位置推定を試みた。1つの空電波形において最初に観測されるパルスは、落雷電流から放射され観測点に直接到達する波(直接波)であり、磁界の南北及び東西方向成分のパルス強度比を調べることで直接波の到来方向、即ち落雷の方向を知ることができる。一方、落雷から放射された空電が電離層と大地の間を多重反射して観測点に到達することから、2つ目以降に観測されるパルス列の時間遅れ間隔を調べることで、落雷までの距離及び電離層高度の両方を推定することができる。実際に観測された空電データのいくつかに対して、この方法を適用して落雷位置を推定し、その結果を北陸電力(株)により提供されている落雷位置情報(複数地点での空電観測に基づく雷位置評定システムによる)と比較したところ、距離数十〜数百kmの範囲の落雷に対して誤差10%以内で一致した。また、この方法に基づく1地点観測からの雷位置推定では、電離層反射時に空電の減衰が大きいためパルス列がはっきりしなくなる昼間よりも、夜間の方が精度良く推定を行えることも分かった。","subitem_description_type":"Abstract"},{"subitem_description":"We have developed a very-low-frequency (VLF) receiver to observe the intense electromagnetic pulses radiated from lightning discharges (VLF spherics). A set of crossed loop antennas is used to measure two horizontal (north-south and east-west) components of wave magnetic fields in the frequency range between 1 and 14 kHz. With a \"pre-trigger\" recording capability intense spheric pulses are automatically recorded onto a PC.\nWe have tried to determine the locations of each individual lightning stroke, by calculating the direction and range to the lightning from the corresponding spheics data measured with this system. The wave form of each VLF spheric usually consists of a couple of sequential pulses. The first pulse comes directly from a lightning return stroke, and is used for direction finding of the stroke, as in a usual way. On the other hand, the second and later pulses are the multiple reflections of the first pulse inside the Earth-ionosphere waveguide. Since the time-of-arrival of each pulse is determined by its propagation path length in the waveguide, by using the observed difference in the time-of-arrival of two or more pulses, we can inversely estimate not only the reflection height of the ionosphere but also the range of the lightning stroke. Thus, it becomes possible to locate lightning strokes from just a single station.\nWe installed this system at Kanazawa University in April 2000, and since then have been continuously observing lightning-generated spherics 24 hours a day. Compared with the lightning location data provided by a Hokuriku Electric power company, preliminary analysis has shown that this system can locate each lightning stroke within several hundred km with the error of about 10%. This technique would be applied to a portable lightning detector carried, for example, by airplanes or ships cruising over a remote area with no conventional lightning detection networks available.","subitem_description_type":"Abstract"}]},"item_9_description_22":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:11640440, 研究期間(年度):1999-2000","subitem_description_type":"Other"},{"subitem_description":"出典：「空電波形観測による新しい近距離雷位置検出システムの開発」研究成果報告書　課題番号11640440\n(KAKEN：科学研究費助成事業データベース（国立情報学研究所）)\n　　　本文データは著者版報告書より作成","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00049395","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_17":{"attribute_name":"公開者","attribute_value_mlt":[{"subitem_publisher":"金沢大学工学部"}]},"item_9_relation_28":{"attribute_name":"関連URI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/search/?qm=50019775"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/search/?qm=50019775","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640440/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640440/","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11640440/116404402000kenkyu_seika_hokoku_gaiyo/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-11640440/116404402000kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_9_version_type_25":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-12-21"}],"displaytype":"detail","filename":"TE-PR-NAGANO-I-kaken 2001-81ｐ.pdf","filesize":[{"value":"9.3 MB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"TE-PR-NAGANO-I-kaken 2001-81ｐ.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/43048/files/TE-PR-NAGANO-I-kaken 2001-81ｐ.pdf"},"version_id":"364f15a3-0615-470a-b790-3d9d020896b4"}]},"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":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"空電波形観測による新しい近距離雷位置検出システムの開発","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"空電波形観測による新しい近距離雷位置検出システムの開発"},{"subitem_title":"Development of a new system for determination of lightning locations via wave form observations of spherics","subitem_title_language":"en"}]},"item_type_id":"9","owner":"18","path":["2833"],"pubdate":{"attribute_name":"公開日","attribute_value":"2017-12-21"},"publish_date":"2017-12-21","publish_status":"0","recid":"43048","relation_version_is_last":true,"title":["空電波形観測による新しい近距離雷位置検出システムの開発"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-07-27T14:46:28.037013+00:00"}