| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
We have constructed a network of ground-based airglow measurements by installing a new airglow imager in Eureka, Canada. This network observation enables us to visualize the electron density variations at the polar cap latitudes, for example, those produced by polar cap patches. By using airglow data from this network we have shown 1) that the spatial structure of polar cap patches is characterized through plasma instability such as gradient-drift instability, 2) that some patches are generated directly from the transient poleward moving aurora in the dayside cusp, 3) that UT and seasonal variations of polar cap patch occurrence are determined by the offset between the geographic and geomagnetic poles, and 4) cheap and small airglow imager is able to detect weak airglow enhancement during the passage of polar cap patches.
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