2010 Fiscal Year Final Research Report
Studies on generation mechanism of the electron density irregularity in the ionospheric cusp region
| Project/Area Number |
20403012
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Japan Aerospace Exploration Agency |
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Principal Investigator |
ABE Takumi Japan Aerospace Exploration Agency, 宇宙科学研究所, 准教授 (40255229)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Yoshifumi 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (30260011)
YOKOTA Shoichiro 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 助教 (30260011)
SHIMOYAMA Manabu 独立行政法人宇宙航空研究開発機構, 宇宙科学研究所, 研究員 (30435804)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 電離圏 / カスプ / 観測ロケット / プラズマイレギュラリティ / 電子密度擾乱 |
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| Research Abstract |
Strong coherent HF backscatter echoes are a well-known characteristic of the polar cusp, and are believed to result from field-aligned plasma irregularities with decameter scale length. However, the generation mechanism has not been understood.
In December 2008, we launched the sounding rocket to elucidate its generation mechanism, and succeeded the direct measurement of the electron density irregularity. The present study brought new insights of this event ; 1) spatial distribution and power spectrum of the density irregularity, 2) spatial relationship with 630 nm auroral emission, and 3) relevance to 100 eV precipitating electrons as a possible energy source.
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