1988 Fiscal Year Final Research Report Summary
Study on Generation Mechanism and Dynamics of Auroral Phenomena in Northern and Southern Hemispheres
| Project/Area Number |
61460051
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | National Institute of Polar Research (NIPR) |
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Principal Investigator |
HIRASAWA Takeo Professor of Research Division in NIPR, 研究系, 教授 (30011571)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAOKA Hiroshi Research Associate of Research Division in NIPR, 研究系, 助手 (10150046)
ONO Takayuki Research Associate of Data Collection and Proccesing Division in NIPR, 資料系, 助手 (10141996)
FUJII Ryoichi Research Associate of Research Division in NIPR, 研究系, 助手 (00132712)
YAMAGISHI Hisao Research Associate of Research Division in NIPR, 研究系, 助手 (20132714)
SATO Natsuo Associate Professor of Data Collection and Proccesing Division in NIPR, 資料系, 助教授 (50132709)
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| Project Period (FY) |
1986 – 1988
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| Keywords | Aurora / ULF / VLF / CNA / 共役性 |
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| Research Abstract |
Generation mechanism and dynamics of the auroral phenomena were studied by using a computer aided digital data base. During the period of this research project which was started in 1986 for three years, many scientific results were presented through the regular scientific meetings and journal publications by the scientific society for the upper atmosphere physics. There were three main scientific products by this project. The first, relationship between the auroral emission and precipitating auroral particles were examined in detail with respect to the particle species as well as energy spectrum. We found clear difference of appearance regions of electron and proton auroras in the evening side of the auroral oval. We also found that the conjugacy of auroral displais in norhern and southern hemispheres depends much on the auroral activity itself. The second, we established the statistical morphology of the ULF and VLF disturbances associanted with auroras. Because our data base cover the simultaneous observations in both hemispheres we could show clear daily and seasonal variations of ULF and VLF activities. We also showed the solar cycle modulation of their activities. The third, we tried to apply our auroral data base to examine the other special observation results such as X-ray imaging observation on board a scientific balloon, and CNA observation with high spatial resolution which was installed at Syowa Station.
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