Improvements of radio occultations of lunar and planetary atmospheres

• Project/Area Number: 20740289
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Space and upper atmospheric physics
• Research Institution: Japan Aerospace Exploration Agency
• Principal Investigator: IMAMURA Takeshi Japan Aerospace Exploration Agency, 宇宙科学研究本部, 准教授 (40311170)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2009: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 地球惑星電離圏 / 惑星大気 / 月 / 電波掩蔽 / 電離層

Research Abstract

月探査「かぐや」での電波掩蔽による月電離層の観測のために、電波経路上にある地球電離層の影響を補正する方法について研究を進めた。「かぐや」の2機の子衛星を用いて、一方が月で掩蔽されているときにもう一方を地球電離層モニター用として、2機それぞれと地上局との間の電波伝搬によって計測される積分電子密度の差をとって月電離層の寄与を取り出した。また、子衛星のうち1機だけを用いた観測は400回近くもあり、これを統計処理することで地球電離層の影響を打ち消すことも試みた。

Research Products

• [Journal Article] Studying the Lunar Ionosphere with SELENE Radio Science Experiment (2010)
  • Author(s): Imamura, et al.
  • Journal Title: Space Science Reviews
  • Peer Reviewed
• [Journal Article] 月電離層の電波掩蔽観測 (2009)
  • Author(s): 今村剛, ほか
  • Journal Title: 測地学会誌 55 Pages: 307-314
  • NAID: 10025592916
  • Peer Reviewed
• [Journal Article] 月電離層の電波掩蔽観測 (2009)
  • Author(s): 今村剛
  • Journal Title: 測地学会誌 55 Pages: 307-314
  • NAID: 10025592916
  • Peer Reviewed
• [Journal Article] Wavenumber spectra of planetary-scale disturbances in the Mars atmosphere (2009)
  • Author(s): Imamura, T., and H.Kobayashi
  • Journal Title: Icarus 199 Pages: 286-294
  • Peer Reviewed
• [Journal Article] Possibility of studying the lunar ionosphere with SELENE radio science experiment (2008)
  • Author(s): T. Imamura, et al.
  • Journal Title: Earth, Planets and Space 60 Pages: 387-390
  • Peer Reviewed
• [Journal Article] Possibility of studying the lunar ionosphere with SELENE radio science experiment (2008)
  • Author(s): Imamura, T., K.-I.Oyama, T.Iwata, Y.Kono, K.Matsumoto, Q.Liu, H.Noda, Y.Futaana, A.Nabatov
  • Journal Title: Earth, Planets and Space 60 Pages: 387-390
  • Peer Reviewed
• [Presentation] Observing the Lunar Ionosphere with SELENE Radio Science (2010)
  • Author(s): T.Imamura
  • Organizer: Asia Oceania Geosciences Society, 6th Annual General meeting
  • Place of Presentation: Suntec, Singapore
  • Year and Date: 2010-08-12
• [Presentation] Initial results of the lunar ionosphere observation with SELENE Radio Science, (2010)
  • Author(s): K.-I.Oyama, T.Imamura, T.Iwata, Z.Yamamoto, A.Navatov, Y.Kono, K.Matsumoto, Q.Liu, H.Noda, H.Hanada, Y.Futaana, A.Saito
  • Organizer: 38th COSPAR Scientific Assembly
  • Place of Presentation: Bremen, Germany
• [Presentation] かぐや電波科学による月電離層の研究 (2009)
  • Author(s): 今村剛, ほか
  • Organizer: 地球電磁気・地球惑星圏学会第126回総会・講演会
  • Place of Presentation: 金沢大学角間キャンパス自然科学本館
  • Year and Date: 2009-09-28
• [Presentation] Observing the Lunar Ionosphere with SELENE Radio Science, Asia Oceania Geosciences Society (2009)
  • Author(s): T. Imamura, et al.
  • Organizer: 6th Annual General meeting
  • Place of Presentation: Suntec, Singapore
  • Year and Date: 2009-08-12
• [Presentation] Studying the Lunar Ionosphere with SELENE Radio Science Experiment (2009)
  • Author(s): Imamura, et al.
  • Organizer: 27th International Symposium on Space Technology and Science
  • Place of Presentation: Epochal Tsukuba, Tsukuba
  • Year and Date: 2009-07-10
• [Presentation] Initial re sults of the lunar ionosphere observation with SELENE Radio Science (2008)
  • Author(s): K.I. Oyama, T. Imamura, et al.
  • Organizer: 38th COSPAR Scientific Assembly
  • Place of Presentation: Bremen, Germany