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Atmospheric loss from the dayside open polar region and its dependence on geomagnetic activity: implications for atmospheric escape on evolutionary timescales
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- Slapak, Rikard (author)
- Luleå tekniska universitet,Rymdteknik
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- Schillings, Audrey (author)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden
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- Nilsson, Hans (author)
- Luleå tekniska universitet,Rymdteknik,Swedish Institute of Space Physics, Kiruna, Sweden
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- 2017-06-12
- 2017
- English.
- In: Annales Geophysicae. - : Copernicus Publications. - 0992-7689 .- 1432-0576. ; 35:3, s. 721-731
- Journal article (peer-reviewed)
Abstract
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- We have investigated the total O+ escape rate from the dayside open polar region and its dependence on geomagnetic activity, specifically Kp. Two different escape routes of magnetospheric plasma into the solar wind, the plasma mantle, and the high-latitude dayside magnetosheath have been investigated separately. The flux of O+ in the plasma mantle is sufficiently fast to subsequently escape further down the magnetotail passing the neutral point, and it is nearly 3 times larger than that in the dayside magnetosheath. The contribution from the plasma mantle route is estimated as ∼ 3. 9 × 1024exp(0. 45 Kp) [s−1] with a 1 to 2 order of magnitude range for a given geomagnetic activity condition. The extrapolation of this result, including escape via the dayside magnetosheath, indicates an average O+ escape of 3 × 1026 s−1 for the most extreme geomagnetic storms. Assuming that the range is mainly caused by the solar EUV level, which was also larger in the past, the average O+ escape could have reached 1027–28 s−1 a few billion years ago. Integration over time suggests a total oxygen escape from ancient times until the present roughly equal to the atmospheric oxygen content today.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Keyword
- Magnetospheric physics
- magnetosheath
- solar wind
- magnetosphere interactions
- storms
- substorms
- Atmosfärsvetenskap
- Atmospheric Science
- Strömningslära
- Fluid Mechanics
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- ref (subject category)
- art (subject category)
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