| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Outline of Final Research Achievements |
In order to understand the evolution of volatiles such as water and carbon dioxide, which are key elements in defining planetary surface environments, it is important to understand how atmospheric escape to space varies with solar activities. This study was conducted under close international collaboration with the science team of NASA’s MAVEN mission to examine how ionospheric ion escape from Mars responds to solar wind variations associated with extreme solar activities, such as CME (coronal mass ejection) and CIR (corotational interaction region). As a result, we statistically derived the escape rate of each ion species through the tailward escape and polar plumes, which consist of two major escape channels for low-energy ions from the Martian ionosphere. We also clarified the regional dependence of the dominant acceleration mechanisms of escaping ion.
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