Chemical response of neutral atmosphere to pulsating aurora

• Project/Area Number: 15H06213
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Space and upper atmospheric physics
• Research Institution: National Institute of Polar Research (2016-2017); The University of Electro-Communications (2015)
• Principal Investigator: Takahashi Toru 国立極地研究所, 研究教育系, 研究員 (40759833)
• Research Collaborator: HOSOKAWA Keisuke 電気通信大学, 情報理工学(系)研究科, 准教授 ; TSUDA Takuo 電気通信大学, 情報理工学(系)研究科, 助教 ; NOZAWA Satonori 名古屋大学, 宇宙地球環境研究所, 准教授 ; OGAWA Yasunobu 国立極地研究所, 研究教育系, 准教授
• Project Period (FY): 2015-08-28 – 2017-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 脈動オーロラ / ナトリウムライダー / EISCATレーダー / 高速観測 / 超高層物理学 / 非干渉散乱レーダー / 大気化学

Outline of Final Research Achievements

We use simultaneous observations from the sodium lidar and EISCAT radar to quantitavely evaluate Na density depletion during the extended period of the pulsating aurora (PsA). In this study, we revealed that this depletion is the consequence of charge transfer reactions between Na atoms and molecular ions (NO+ and O2+) produced by high-energy electron precipitations PsA.
Furthermore, the temporal resolution of the sodium density observed with the sodium lidar has been improved from 5 sec to 0.2 sec. The high speed observation of the sodium lidar and EISCAT allow us to evaluate the sodium density depletion harmonized with the PsA.

Research Products

• [Int'l Joint Research] トロムソ大学(ノルウェー)
• [Int'l Joint Research] オウル大学(フィンランド)
• [Journal Article] Depletion of mesospheric sodium during extended period of pulsating aurora (2017)
  • Author(s): T. Takahashi, K. Hosokawa, S. Nozawa, T. T. Tsuda, Y. Ogawa, M. Tsutsumi, Y. Hiraki, H. Fujiwara, T. D. Kawahara, N. Saito, S. Wada, T. Kawabata, and C. Hall
  • Journal Title: J. Geophys. Res. Space Physics Volume: 122 Issue: 1 Pages: 1212-1220
  • DOI: 10.1002/2016ja023472
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Statistical investigation of Na layer response to geomagnetic activity using resonance scattering measurements by Odin/OSIRIS (2017)
  • Author(s): Takuo T. Tsuda, Takuji Nakamura, Mitsumu K. Ejiri, Takanori Nishiyama, Keisuke Hosokawa, Toru Takahashi, Jorg Gumbel, Johas Hedin
  • Journal Title: Geophysical Research Letters Volume: 44 Issue: 12 Pages: 5943-5950
  • DOI: 10.1002/2017gl072801
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A sporadic sodium layer event detected with five-directional lidar and simultaneous wind, electron density, and electric field observation at Tromso, Norway (2015)
  • Author(s): Tsuda, T. T., S. Nozawa, T. D. Kawahara, T. Kawabata, N. Saito, S. Wada, C. M. Hall, M. Tsutsumi, Y. Ogawa, S. Oyama, T. Takahashi, M. K. Ejiri,T. Nishiyama, T. Nakamura,and A. Brekke
  • Journal Title: Geophysical Research Letters Volume: 42 Issue: 21 Pages: 9190-9196
  • DOI: 10.1002/2015gl066411
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Lidar project for thermospheric sodium observations at EISCAT radar site in Norway (2018)
  • Author(s): Takuya D. Kawahara, Satonori Nozawa, Norihito Saito, Takuo T. Tsuda, Testuya Kawabata, Toru Takahashi, Satoshi Wada
  • Organizer: Laser Solutions for Space and the Earth 2018
  • Int'l Joint Research / Invited
• [Presentation] 光リモートセンシングによる超高層大気の研究 (2018)
  • Author(s): 津田卓雄, 斎藤徳人, 野澤悟徳, 川原琢也, 川端哲也, 高橋透, C. M. Hall, 和田智之, 中村卓司, 江尻省, 西山尚典, 阿保真, 津野克彦, J. Gumbel, J. Hedin
  • Organizer: レーザー学会学術講演会第38回年次大会
  • Invited
• [Presentation] Electric filed modulations induced by auroral patches observed with EISCAT and KAIRA radars (2017)
  • Author(s): Toru Takahashi, Ilkka I. Virtanen, Keisuke Hosokawa, Yasunobu Ogawa, Anita Aikio, and Hiroshi Miyaoka
  • Organizer: Fifth International Symposium on Arctic Research
  • Int'l Joint Research
• [Presentation] Depletion of mesospheric sodium during extended period of pulsating aurora: high speed sodium lidar observation (2017)
  • Author(s): Toru Takahashi, Keisuke Hosokawa, Satonori Nozawa, Takuo T. Tsuda, Yasunobu Ogawa, Masaki Tsutsumi, Yasutaka Hiraki, Hitoshi Fujiwara, Takuya D. Kawahara, Norihito Saito, Satoshi Wada, Tetsuya Kawabata, Chris Hall, and Hiroshi Miyaoka
  • Organizer: 2017 CEDAR Workshop
  • Int'l Joint Research
• [Presentation] Depletion of mesospheric sodium during extended period of pulsating aurora (2017)
  • Author(s): Toru Takahashi, K. Hosokawa, S. Nozawa, T. T. Tsuda, Y. Ogawa, M. Tsutsumi, Y. Hiraki, H. Fujiwara, T. D. Kawahara, N. Saito, S. Wada, T. Kawabata, C. Hall, and H. Miyaoka
  • Organizer: 18th EISCAT International symposium and MST15/iMST2 work shop
  • Int'l Joint Research
• [Presentation] Gradient drift instability in the trailing edge of polar patches (2017)
  • Author(s): Toru Takahashi, Yasutaka Hiraki, Keisuke Hosokawa, Yasunobu Ogawa, Jun Sakai, and Hiroshi Miyaoka
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Pulsating aurora-induced Na density depletion in the polar MLT region: high-speed sodium lidar and EISCAT radar observation (2017)
  • Author(s): Toru Takahashi, Takuo T. Tsuda, Keisuke Hosokawa, Satonori Nozawa, Yasunobu Ogawa, Masaki Tsutsumi, Yasutaka Hiraki, Takuya D. Kawahara, Norihito Saito, Satoshi Wada, Tetsuya Kawabata, Chris Hall, and Hiroshi Miyaoka
  • Organizer: Laser Solutions for Space and the Earth
  • Int'l Joint Research
• [Presentation] High-time resolution plasma drift observations with EISCAT and KAIRA (2017)
  • Author(s): Ilkka Virtanen, Yasunobu Ogawa, Keisuke Hosokawa, Toru Takahashi, Anita Aikio, and Thomas Ulich
  • Organizer: 18th EISCAT International symposium and MST15/iMST2 work shop
  • Int'l Joint Research
• [Presentation] Upgrade plan of an injection seeded, laser diode-pumped Nd:YAG laser-based sodium lidar (2017)
  • Author(s): Takuya D Kawahara, Satonori Nozawa, Norihito Saito, Tetsuya Kawabata, Takuo T. Tsuda, Toru Takahashi, and Satoshi Wada
  • Organizer: 18th EISCAT International symposium and MST15/iMST2 work shop
  • Int'l Joint Research
• [Presentation] Vertical motion of the neutral atmosphere in the polar MLT region (2017)
  • Author(s): Satonori Nozawa, Takuo Tsuda, Yasunobu Ogawa, Hitoshi Fujiwara, Takuya Kawahara, Norihito Saito, Satoshi Wada, Toru Takahashi, Masaki Tsutsumi, Tetsuya Kawabata, Chris Hall, and Asgeir Brekke
  • Organizer: 18th EISCAT International symposium and MST15/iMST2 work shop
  • Int'l Joint Research
• [Presentation] Vertical motion of the neutral atmosphere above Tromsoe (2017)
  • Author(s): Satonori Nozawa, Yasunobu Ogawa, Hitoshi Fujiwara, Takuya Kawahara, Takuo T. Tsuda, Norihito Saito, Satoshi Wada, Toru Takahashi, Masaki Tsutsumi, Tetsuya Kawabata, Chris Hall, Asgeir Brekke
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Statistical study of sporadic sodium layer (SSL) in the polar lower thermosphere and upper mesosphere by using the Tromsoe sodium LIDAR (2017)
  • Author(s): Yohei Ogawa, Satonori Nozawa, Takuo T. Tsuda, Takuya Kawahara, Yasunobu Ogawa, Hitoshi Fujiwara, Norihito Saito, Satoshi Wada, Toru Takahashi, Masaki Tsutsumi, Tetusya Kawabata, Chris Hall, Asgeir Brekke
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Energetic particle impact on the Na layer (2017)
  • Author(s): Takuo T. Tsuda, Toru Takahashi, Satonori Nozawa, Takuya D. Kawahara, Tetsuya Kawabata, Norihito Saito, Satoshi Wada, Chris M. Hall, Yasunobu Ogawa, Keisuke Hosokawa, Takuji Nakamura, Mitsumu K. Ejiri, Takanori Nishiyama, Makoto Abo, Katsuhiko Tsuno, Jorg Gumbel, Jonas Hedin
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research / Invited
• [Presentation] Sodium LIDAR observations of polar mesosphere and lower thermosphere (2017)
  • Author(s): Satonori Nozawa, Takuya Kawahara, Takuo T. Tsuda, Yasunobu Ogawa, Toru Takahashi, Norihito Saito, Satoshi Wada, Hitoshi Fujiwara, Masaki Tsutsumi, Chris Hall, Tetsuya Kawabata, Yasunobu Ogawa, Asgeir Brekke
  • Organizer: Laser Solutions for Space and the Earth
  • Int'l Joint Research / Invited
• [Presentation] Study on the Earth’s metallic layers using optical remote sensing observations (2017)
  • Author(s): Toru T. Tsuda, Norihito Saito, Satoshi Nozawa, Takuya D. Kawahara, Tetsuya Kawabata, Toru Takahashi, Chris M. Hall, Satoshi Wada, Takuji Nakamura, Mitsumu K. Ejiri, Takanori Nishiyama, Makoto Abo, Katsuhiko Tsuno, Jorg Gumbel, and Johas Hedin
  • Organizer: Laser Solutions for Space and the Earth
  • Int'l Joint Research
• [Presentation] Polarization electric field inside of auroral patches observed with EISCAT and KAIRA radars (2017)
  • Author(s): Toru Takahashi, Ilkka I. Virtanen, Keisuke Hosokawa, Yasunobu Ogawa, Anita Aikio, and Hiroshi Miyaoka
  • Organizer: 第8回極域科学シンポジウム
• [Presentation] 脈動オーロラによって生成された電離圏分極電場 (2017)
  • Author(s): 高橋透, Ilkka I. Virtanen, 細川敬祐, 小川泰信, Anita Aikio, 宮岡 宏
  • Organizer: 第142回地球電磁気・地球惑星圏学会
• [Presentation] ポーラーパッチ後縁に出現する指状構造のスケールの統計解析 (2017)
  • Author(s): 高橋透, 平木康隆, 細川敬祐, 小川泰信, 坂井純, 宮岡宏
  • Organizer: MTI研究集会
• [Presentation] ポーラーパッチ後縁に出現する指状構造の形成メカニズム (2017)
  • Author(s): 高橋透, 平木康隆, 細川敬祐, 小川泰信, 坂井純, 宮岡宏
  • Organizer: Symposium of Space Science and Radio Engineering
• [Presentation] Studies of the polar lower thermosphere and mesosphere based on simultaneous observations of EISCAT radars and a sodium LIDAR (2017)
  • Author(s): Satonori Nozawa, Takuya D. Kawahara, Yasunobu Ogawa, Norihito Saito, Takuo T. Tsuda, Toru Takahashi, Satoshi Wada, Hitoshi Fujiwara, Masaki Tsutsumi, Chris Hall, Tetsuya Kawabata, Asgeir Brekke
  • Organizer: 第8回極域科学シンポジウム
• [Presentation] Sapphire cell development for the daytime Na lidar observations at Tromso (2017)
  • Author(s): Takuya D. Kawahara, Satonori Nozawa, Norihito Saito, Takuo T. Tsuda, Tetsuya Kawabata, Toru Takahashi, Satoshi Wada
  • Organizer: 第8回極域科学シンポジウム
• [Presentation] トロムソにおけるナトリウムライダーの夏期定常観測に向けて：単結晶サファイアを用いた磁気光学狭帯域フィルタ開発 (2017)
  • Author(s): 川原琢也, 野澤悟徳, 斎藤徳人, 津田卓雄, 和田智之, 高橋透, 川端哲也
  • Organizer: 第142回地球電磁気・地球惑星圏学会
• [Presentation] Vertical motion of the neutral atmosphere in the winter polar MLT region using the sodium LIDAR at Tromsoe (2017)
  • Author(s): Satonori Nozawa, Takuo Tsuda, Yasunobu Ogawa, Hitoshi Fujiwara, Takuya Kawahara, Norihito Saito, Satoshi Wada, Toru Takahashi, Masaki Tsutsumi, Tetsuya Kawabata, Chris Hall, Asgeir Brekke
  • Organizer: 第142回地球電磁気・地球惑星圏学会
• [Presentation] 光リモートセンシングによる金属層の動態研究: オーロラ粒子による影響 (2017)
  • Author(s): 津田卓雄, 中村卓司, 江尻省, 西山尚典, 阿保真, 津野克彦, 野澤悟徳, 川原琢也, 川端哲也, 斎藤徳人, 和田智之, C. M. Hall, 高橋透, J. Gumbel, J. Hedin
  • Organizer: MTI研究集会
• [Presentation] 高エネルギー降下粒子がNa層に与える影響: Odin/OSIRISデータの統計解析 (2017)
  • Author(s): 津田卓雄, 細川敬祐, 中村卓司, 江尻省, 西山尚典, 高橋透, J. Gumbel, and J. Hedin
  • Organizer: 脈動オーロラ研究集会
• [Presentation] 光学リモートセンシングによる金属原子層・金属イオン層の研究 (2017)
  • Author(s): 津田卓雄, 中村卓司, 江尻省, 西山尚典, 阿保真, 津野克彦, 野澤悟徳, 川原琢也, 川端哲也, 斎藤徳人, 和田智之, C. M. Hall, 高橋透, J. Gumbel, J. Hedin
  • Organizer: 大気ライダー研究会
  • Invited
• [Presentation] Statistical investigation on Na layer response to geomagnetic activity using Odin/OSIRIS data in 2004-2010 (2016)
  • Author(s): Takuo T. Tsuda, Keisuke Hosokawa, Takuji Nakamura, Mitsumu K. Ejiri, Takanori Nishiyama, Toru Takahashi, Jorg Gumbel, and Johas Hedin
  • Organizer: 2nd PSTEP International Symposium (PSTEP-2)
  • Int'l Joint Research
• [Presentation] Na layer response to geomagnetic activities: statistical analysis based on Odin/OSIRIS data (2016)
  • Author(s): Takuo T. Tsuda, Takanori Nakamura, Mitsumu K. Ejiri, Takanori Nishiyama, Keisuke Hosokawa, Toru Takahashi, Jorg Gumbel, and Johas Hedin
  • Organizer: Irago Conference 2016
  • Int'l Joint Research
• [Presentation] Formation of finger-like structure along the edge of polar patch: two-dimensional numerical simulations and ESR observations (2016)
  • Author(s): Toru Takahashi, Yasutaka Hiraki, Keisuke Hosokawa, Yasunobu Ogawa, Jun Sakai
  • Organizer: 極域科学シンポジウム
• [Presentation] ポーラーパッチ後縁部に見られる指状構造: 2次元数値シミュレーションとESRによる観測データの比較 (2016)
  • Author(s): 高橋透, 平木康隆, 細川敬祐, 小川泰信, 坂井純
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] 高速ナトリウムライダー観測による脈動オーロラが引き起こすナトリウム密度変動の研究 (2016)
  • Author(s): 高橋透、細川敬祐、野澤悟徳、津田卓雄、小川泰信、堤雅基、平木康隆、藤原均、川原琢也、斎藤徳人、和田智之、川端哲也、Hall Chris
  • Organizer: MTI研究集会
• [Presentation] 脈動オーロラが起こすナトリウム密度変動の研究: 高速ナトリウムライダー観測 (2016)
  • Author(s): 高橋透, 津田卓雄, 細川敬祐, 野澤悟徳, 小川泰信, 川原琢也, 斎藤徳人, 和田智之, 川端哲也, Hall Chris
  • Organizer: 日本地球惑星科学連合2016年大会
• [Presentation] 共鳴散乱ライダー観測における動作環境温度モニター用小型モジュールの開発 (2016)
  • Author(s): 谷遼, 江尻省, 西山尚典, 津野克彦, 中村卓司, 高橋透, 古川裕介, 米田仁紀, 桂川 眞幸
  • Organizer: 極域科学シンポジウム
• [Presentation] トロムソナトリウムライダーを用いた北極域SSLの統計解析 (2016)
  • Author(s): 小川洋平、野澤悟徳、津田卓雄、川原琢也、小川泰信、藤原均、斎藤徳人、和田智之、高橋透, 堤雅基, 川端哲也, Hall Chris、Brekke Asgeir
  • Organizer: 極域科学シンポジウム
• [Presentation] Na layer response to geomagnetic activities: statistical analysis based on Odin/OSIRIS data (2016)
  • Author(s): T. T. Tsuda, T. Nakamura, M. K. Ejiri, T. Nishiyama, K. Hosokawa, T. Takahashi, J. Gumbel, and J. Hedin
  • Organizer: 第7回極域科学シンポジウム
• [Presentation] 成層圏突然昇温にともなう北極域下部熱圏・中間圏変動 (2016)
  • Author(s): 野澤悟徳, 小川泰信, 津田卓雄, 藤原均, 堤雅基, 三好勉信, Hall Chris, Buchert Stephan C., 斎藤徳人, 和田智之, 川原琢也, 高橋透, 川端哲也, Brekke Asgeir
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] 波長可変共鳴散乱ライダーにおける送信レーザ周波数モニタシステムの開発 ~極域MLT領域の鉛直風観測を目指して~ (2016)
  • Author(s): #江尻省, 西山尚典, 津野克彦, She Chiao-Yao, 津田卓雄, 高橋透, 阿保真, 和田智之, 川原琢也, 中村卓司
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] Time and height variability of Fe-layer in the Mesosphere and the Lower Thermosphere region at NIPR (36N, 140E) (2016)
  • Author(s): Takanori Nishiyama, Mitsumu K. Ejiri, Takuo Tsuda, Toru Takahashi, Katsuhiko Tsuno, Makoto Abo, Takuya Kawahara, Satoshi Wada, Takuji Nakamura
  • Organizer: 地球電磁気・地球惑星圏学会
• [Presentation] Sodium density depletion during electron density enhancements by auroral particle precipitation (2015)
  • Author(s): T. Takahashi, K. Hosokawa, S. Nozawa, T. T. Tsuda, Y. Hiraki, J. Sakai, Y. Ogawa, T. D. Kawahara, N. Saito, S. Wada, T. Kawabata, C. M. Hall
  • Organizer: 第6回極域科学シンポジウム
  • Place of Presentation: 国立極地研究所（東京都立川市）
  • Year and Date: 2015-11-17
• [Presentation] Depletion of mesospheric sodium during extended period of pulsating aurora (2015)
  • Author(s): T. Takahashi, K. Hosokawa, S. Nozawa, T. Tsuda, Y. Ogawa, T. Kawahara, Y. Hiraki, J. Sakai, N. Saito, S. Wada, T. Kawabata, Chris Hall
  • Organizer: 地球電磁気・地球惑星圏学会
  • Place of Presentation: 東京大学（東京都文京区）
  • Year and Date: 2015-11-02
• [Presentation] パルセーティングオーロラ出現時における中間圏ナトリウム密度減少 (2015)
  • Author(s): 高橋透, 細川敬祐, 野澤悟徳, 津田卓雄, 小川泰信, 川原琢也, 平木康隆, 坂井純, 斎藤徳人, 和田智之, 川端哲也, Hall Chris
  • Organizer: MTI研究集会
  • Place of Presentation: 情報通信研究機構（東京小金井市）
  • Year and Date: 2015-08-31