2001 Fiscal Year Final Research Report Summary
Study of interaction between neutral and ionized atmosphere through field-aligned
| Project/Area Number |
11304028
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
FUKAO S Kyoto University, Radio Science Center for Space and Atmosphere, Professor, 宙空電波科学研究センター, 教授 (30026249)
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| Co-Investigator(Kenkyū-buntansha) |
HASHIGUCHI H Kyoto University, Radio Science Center for Space and Atmosphere, Asssociate Professor, 宙空電波科学研究センター, 助教授 (90293943)
IYEMORII T Kyoto University, Data Analysis Center for Geomagnetism and Space Magnetism, Professor, 大学院・理学研究科附属地磁気世界資料解析センター, 教授 (40144315)
YAMAMOTO M Kyoto University, Radio Science Center for Space and Atmosphere, Asssociate Professor, 宙空電波科学研究センター, 助教授 (20210560)
OGAWA T Nagoya University, Solar-Terrestrial Environment Laboratory, Professor, 太陽地球環境研究所, 教授 (60271607)
NAKAMURA T Kyoto University, Radio Science Center for Space and Atmosphere, Asssociate Professor, 宙空電波科学研究センター, 助教授 (40217857)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Midlatitude ionosphere / Ionospheric irregularity / Ouasi-Periodic Echo / Sporadic-E layer / Spread Fe / Radar observation / Computer simulation / WestPac campaign |
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| Research Abstract |
From our previous studies we expect that field-aligned irregularities (FAI) in the ionospheric F- and E-regions are associated with the Perkins instability and the gradient-drift-instability, respectively. However we are still far from the understanding of their complicated generating processes and reason of spatial structures. With this grant-in-aid for scientific research, we conducted number of observation campaigns in Japan and abroad to reveal coupling processes between neutral and ionized atmosphere, and published 40 papers to famous international journals. Following is the list of studies we conducted under this grant.
1. We developed a new radar of 31.57 MHz for observing E-region FAI and meteor echoes. We can measure neutral winds simultaneously with the E-region FAI echoes. The radar was completed in the MU radar site in 2000, and used for long-term experiment. We could find accurate frequency occurrence of the FAI echoes, and its correlation with the neutral winds.
2. Study of E-region FAI : We operated the FM-CW radar of Communication Research Laboratory in Fukui obtain ionogram simultaneously with the MU radar. In USA radar observations of Quasi-Periodic echoes were conducted with SRI International. We developed two dimensional computer simulation, and studied generation of polarization electric field.
3. Study of F-region FAI : We participated in the WestPac campaign (network of ionosondes from Taiwan to Indonesia), and operated the FM-CW radar in Cebu, Philippines. We conducted the FRONT campaign to study F-region ionosphere and FAI with the MU radar, airglow imagers and GPS receivers. With the Equatorial Atmosphere Radar completed in Indonesia, we conducted the first observations of FAI in the southern low-latitude region. Through these observations we studied F-region FAI and its relationship to the background atmosphere.
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