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        <datestamp>2025-03-18T04:12:00Z</datestamp>
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          <dc:title xml:lang="ja">宇宙天気と地球低軌道の4層構造</dc:title>
          <dcterms:alternative xml:lang="en">Space Weather and the Four Layer Structure of LEO</dcterms:alternative>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="ja">玉置, 晋</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="ja">アルヴェリウス, 幸子</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="ja">野澤, 恵</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">TAMAOKI, Susumu</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">ARVELIUS, Sachiko</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:creator>
            <jpcoar:creatorName xml:lang="en">NOZAWA, Satoshi</jpcoar:creatorName>
          </jpcoar:creator>
          <jpcoar:subject xml:lang="en" subjectScheme="Other">Space Weather</jpcoar:subject>
          <jpcoar:subject xml:lang="en" subjectScheme="Other">Aerodynamic Drag</jpcoar:subject>
          <jpcoar:subject xml:lang="en" subjectScheme="Other">LEO</jpcoar:subject>
          <jpcoar:subject xml:lang="en" subjectScheme="Other">TLE</jpcoar:subject>
          <datacite:description xml:lang="ja" descriptionType="Abstract">衛星運用における宇宙天気ハザードリスクの一つに大気ドラッグがある．太陽活動の活発化により，大気ドラッグが増加し，宇宙物体が落下することで，軌道上寿命を減らし，許容される軌道保持範囲逸脱のリスクを増やす可能性がある．一方で，大気ドラッグが小さいケースにおいて，宇宙物体が軌道上に留まり続け，宇宙ごみを増やす．本研究では，宇宙物体の高度低下の観点で地球低軌道（LEO：Low Earth Orbit）における大気ドラッグの特徴の理解を深める為に4 層構造に分類することを試みた．各層の大気ドラッグによる高度低下量を2 つの衛星に注目して調べ，太陽活動周期と地磁気嵐のどちらに起因しているのか，考察を行った．</datacite:description>
          <datacite:description xml:lang="en" descriptionType="Other">One of the space weather hazard risks in satellite operation is aerodynamic drag. Aerodynamic drag increases due to the ascending phase of the solar activity, and space objects fall, which can reduce the life in orbit and increase the risk of permissible orbital holding range deviations. On the other hand, in the case where drag is small, space objects in orbit increase the production risk of space debris. We classify Low Earth Orbits (LEO) into four layers based on the characteristics of the aerodynamic drag in the satellite orbit, deriving from the change in the orbital altitude of the satellites. In examining the amount of altitude decrease due to aerodynamic drag in each layer, we focused on two satellites in particular and investigated whether these two cases were caused by both/either solar cyclic activity and/or geomagnetic storms.</datacite:description>
          <datacite:description xml:lang="ja" descriptionType="Other">形態: カラー図版あり</datacite:description>
          <datacite:description xml:lang="en" descriptionType="Other">Physical characteristics: Original contains color illustrations</datacite:description>
          <datacite:description xml:lang="ja" descriptionType="Other">資料番号: AA2230028006</datacite:description>
          <datacite:description xml:lang="ja" descriptionType="Other">レポート番号: JAXA-RR-22-009</datacite:description>
          <dc:publisher xml:lang="ja">宇宙航空研究開発機構(JAXA)</dc:publisher>
          <dc:publisher xml:lang="en">Japan Aerospace Exploration Agency (JAXA)</dc:publisher>
          <datacite:date dateType="Issued">2023-02-28</datacite:date>
          <dc:language>jpn</dc:language>
          <dc:type rdf:resource="http://purl.org/coar/resource_type/c_18gh">technical report</dc:type>
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          <jpcoar:identifier identifierType="DOI">https://doi.org/10.20637/00049171</jpcoar:identifier>
          <jpcoar:identifier identifierType="URI">https://jaxa.repo.nii.ac.jp/records/49189</jpcoar:identifier>
          <jpcoar:identifierRegistration identifierType="JaLC">10.20637/00049171</jpcoar:identifierRegistration>
          <jpcoar:sourceIdentifier identifierType="EISSN">2433-2216</jpcoar:sourceIdentifier>
          <jpcoar:sourceTitle xml:lang="ja">宇宙航空研究開発機構研究開発報告: 宇宙科学情報解析論文誌: 第12号</jpcoar:sourceTitle>
          <jpcoar:sourceTitle xml:lang="en">JAXA Research and Development Report: Journal of Space Science Informatics Japan: Volume 12</jpcoar:sourceTitle>
          <jpcoar:volume>JAXA-RR-22-009</jpcoar:volume>
          <jpcoar:pageStart>51</jpcoar:pageStart>
          <jpcoar:pageEnd>61</jpcoar:pageEnd>
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