Study on the Emission Mechanism of Jupiter's Decametric Radio Waves by using a High Sensitive Dual-Polarized Antenna System LWA1

• Project/Area Number: 25400480
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Space and upper atmospheric physics
• Research Institution: Kochi National College of Technology
• Principal Investigator: IMAI Kazumasa 高知工業高等専門学校, 電気情報工学科, 教授 (20132657)
• Research Collaborator: Clarke Tracy Naval Research Laboratory ; Higgins Chuck Middle Tennessee State University ; Reyes Francisco University of Florida ; IMAI Masafumi 京都大学, 大学院
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 地球惑星科学 / 宇宙プラズマ波動 / 木星電波 / 電波放射機構 / 偏波観測 / モジュレーションレーン / 木星電波放射機構 / 惑星電波放射寄稿 / モジュレーションレーン法 / 惑星電波放射機構 / 宇宙プラズマ・プラズマ波動

Outline of Final Research Achievements

The radiation mechanism of Jupiter's decametric radio emissions has not been fully understood. We analyzed the data observed by a high sensitive dual-polarized antenna system LWA1. The measured fine structures of modulation lanes on the both right and left hand polarization components of the dynamic spectrum show the existence of two components coming from different hemisphere radio sources. We successfully identified the Jupiter radio components coming from the regions related to the UV auroras of the Io plasma torus. These results add important information regarding the emission mechanism of Jupiter's decametric radio waves.

Research Products

• [Journal Article] Modeling Jovian hectometric attenuation lanes during the Cassini flyby of Jupiter (2015)
  • Author(s): Masafumi Imai, Alain Lecacheux, Michel Moncuquet, Fran Bagenal, Charles A. Higgins, Kazumasa Imai, James R. Thieman
  • Journal Title: Journal of Geophysical Research: Space Physics Volume: 120 Issue: 3 Pages: 1888-1907
  • DOI: 10.1002/2014ja020815
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Probing Jovian decametric emission with the long wavelength array station 1 (2014)
  • Author(s): T. E. Clarke, C. A. Higgins, Jinhie Skarda, Kazumasa Imai, Masafumi Imai, Francisco Reyes, Jim Thieman, Ted Jaeger, Henrique Schmitt, Nagini Paravastu Dalal, Jayce Dowell, S. W. Ellingson, Brian Hicks, Frank Schinzel and G. B. Taylor
  • Journal Title: Journal of Geophysical Research, Space Physics Volume: 119 Issue: 12 Pages: 9508-9526
  • DOI: 10.1002/2014ja020289
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 高専連携CubeSatによる木星電波観測プロジェクトについて (2015)
  • Author(s): 今井一雅、高田 拓、北村健太郎、平社信人、高専スペース連携グループ
  • Organizer: 第138回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 東京大学
  • Year and Date: 2015-11-03
• [Presentation] LWA1モジュレーションレーンデータによる木星電波源の位置の測定について (2015)
  • Author(s): 今井一雅、今井雅文、Charles A. Higgins、Tracy Clarke
  • Organizer: 第138回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 東京大学
  • Year and Date: 2015-11-01
• [Presentation] 木星電波観測用超小型衛星の開発(1) (2015)
  • Author(s): 尾崎 聡、窪田貴久、今井一雅、迫田成正、大澤椋太、平社信人
  • Organizer: 平成27年度電気関係学会四国支部連合大会
  • Place of Presentation: 高知工科大学
  • Year and Date: 2015-09-26
• [Presentation] 木星電波観測用超小型衛星の開発(2) (2015)
  • Author(s): 窪田貴久、尾崎 聡、今井一雅、迫田成正、大澤椋太、平社信人
  • Organizer: 平成27年度電気関係学会四国支部連合大会
  • Place of Presentation: 高知工科大学
  • Year and Date: 2015-09-26
• [Presentation] Characteristics of Jupiter's decametric modulation lanes observed by LWA1 (2015)
  • Author(s): K. Imai, Y. Shimanouchi, M. Imai, T. Clarke, C.A. Higgins, F. Reyes, J.R. Thieman
  • Organizer: Magnetospheres of the Outer Planets 2015
  • Place of Presentation: Georgia Institute of Technology, Atlanta, USA
  • Year and Date: 2015-06-04
  • Int'l Joint Research
• [Presentation] Characteristics of the Jupiter decameter Io-D source (2015)
  • Author(s): C. Higgins, T. Clarke, F. Reyes, J. Thieman, M. Imai, K. Imai, D. Typinski
  • Organizer: Magnetospheres of the Outer Planets 2015
  • Place of Presentation: Georgia Institute of Technology, Atlanta, USA
  • Year and Date: 2015-06-03
  • Int'l Joint Research
• [Presentation] Probing Jovian decametric emission with the Long Wavelength Array Station 1 (2015)
  • Author(s): T.E. Clarke, C.A. Higgins, J. Skarda, K. Imai, M. Imai, F. Reyes, J. Thieman
  • Organizer: Magnetospheres of the Outer Planets 2015
  • Place of Presentation: Georgia Institute of Technology, Atlanta, USA
  • Year and Date: 2015-06-02
  • Int'l Joint Research
• [Presentation] Jupiter's decametric radio common observation campaign from LWA1, NDA, and URAN-2 in late 2014 and early 2015 (2015)
  • Author(s): M. Imai, A. Lecacheux, C.A. Higgins, T.E. Clarke, M. Panchenko, A.I. Brazhenko, A.V. Frantsuzenko, A.A. Konovalenko, K. Imai
  • Organizer: Magnetospheres of the Outer Planets 2015
  • Place of Presentation: Georgia Institute of Technology, Atlanta, USA
  • Year and Date: 2015-06-02
  • Int'l Joint Research
• [Presentation] CubeSatによる超低高度域(<400km)でのSq電流観測計画 (2015)
  • Author(s): 北村健太郎、今井一雅、高田 拓、篠原 学、池田昭大、若林 誠、高専スペース連携グループ
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 千葉市・幕張メッセ
  • Year and Date: 2015-05-27
• [Presentation] LWA1で観測された木星電波モジュレーションレーンの微細構造 (2015)
  • Author(s): 今井一雅、島内良章、今井雅文、Tracy Clarke、Charles A. Higgins
  • Organizer: 日本地球惑星科学連合2015年大会
  • Place of Presentation: 千葉市・幕張メッセ
  • Year and Date: 2015-05-26
• [Presentation] LWA1で観測された木星電波モジュレーションレーンのデータ解析 (2014)
  • Author(s): 島内良章、今井一雅、今井雅文、Tracy Clarke、Charles A. Higgins、Jinhie Skarda
  • Organizer: 第136回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 長野県松本文化会館
  • Year and Date: 2014-11-02
• [Presentation] LWA1で観測された木星電波モジュレーションレーンについて (2014)
  • Author(s): 今井一雅、島内良章、今井雅文、Tracy Clarke、Charles A. Higgins、Jinhie Skarda
  • Organizer: 第136回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 長野県松本文化会館
  • Year and Date: 2014-11-01
• [Presentation] 画像処理による木星電波モジュレーションレーンの傾き算出の検討 (2014)
  • Author(s): 島内良章、今井一雅
  • Organizer: 平成26年度電気関係学会四国支部連合大会
  • Place of Presentation: 徳島大学
  • Year and Date: 2014-09-13
• [Presentation] LWA1 で観測された木星電波 Io-C モジュレーションレーンについて (2) (2014)
  • Author(s): 今井一雅，島内良章，T. Clarke，C. A. Higgins，今井雅文
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜 会議センター
  • Year and Date: 2014-05-01
• [Presentation] LWA1で観測された木星電波のデータ解析 (2014)
  • Author(s): 島内良章，今井一雅，T. Clarke，C. A. Higgins，今井雅文
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜 会議センター
  • Year and Date: 2014-05-01
• [Presentation] LWA1 で観測された木星電波 Io-C モジュレーションレーンについて
  • Author(s): 今井一雅，Clarke Tracy，福島光一，氏原明也，今井雅文
  • Organizer: 日本地球惑星科学連合2012年大会
  • Place of Presentation: 幕張メッセ国際会議場
• [Presentation] Ray tracing study on attenuation bands within Jovian hectometric radiation
  • Author(s): Masafumi Imai, Charles A. Higgins, Alain Lecacheux, Kazumasa Imai, James R. Thieman, Toshihiko Iyemori
  • Organizer: Magnetospheres of Outer Planets meeting
  • Place of Presentation: Athens, Greece
• [Presentation] Jupiter's Decametric modulation lanes observed by the Long Wavelength Array (LWA)
  • Author(s): Kazumasa Imai, Tracy Clarke, Masafumi Imai, Charles A. Higgins, Francisco Reyes
  • Organizer: Magnetospheres of Outer Planets meeting
  • Place of Presentation: Athens, Greece
• [Presentation] Jovian decametric emission observations: New data from the LWA1 and 50 years of older data from UFRO
  • Author(s): Charles A. Higgins, Tracy Clarke, Jinhie Skarda, Kazumasa Imai, Francisco Reyes
  • Organizer: 第134回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 高知大学
• [Presentation] Modulation lanes of Jovian decametric radio emission observed by the Long Wavelength Array Station 1 (LWA1)
  • Author(s): Kazumasa Imai, Tracy Clarke, Masafumi Imai, Charles A. Higgins, Francisco Reyes
  • Organizer: 第134回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 高知大学
• [Presentation] Ray tracing study on Jovian hectometric attenuation lanes
  • Author(s): Masafumi Imai, Charles A. Higgins, Alain Lecacheux, Kazumasa Imai, James R. Thieman
  • Organizer: 第134回地球電磁気・地球惑星圏学会講演会
  • Place of Presentation: 高知大学
• [Remarks] Jupiter Radio Home Page
  • URL: http://jupiter.kochi-ct.jp/
• [Remarks] Internet Jupiter Radio Observatory
  • URL: http://jupiter.kochi-ct.jp/