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Spatial characteris...
Spatial characteristics of wave-like structures in diffuse aurora obtained using optical observations
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- Axelsson, Katarina (author)
- Luleå tekniska universitet,Rymdteknik
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- Sergienko, T. (author)
- Swedish Institute of Space Physics / Institutet för rymdfysik
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- Nilsson, H. (author)
- Swedish Institute of Space Physics / Institutet för rymdfysik
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- Brändström, U. (author)
- Swedish Institute of Space Physics / Institutet för rymdfysik
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- Ebihara, Y. (author)
- Research Institute for Sustainable Humanosphere, Kyoto University
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- Asamura, K. (author)
- Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara
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- Hirahara, M. (author)
- Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo
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(creator_code:org_t)
- 2012-12-14
- 2012
- English.
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In: Annales Geophysicae. - : Copernicus GmbH. - 0992-7689 .- 1432-0576. ; 30:12, s. 1693-1701
- Related links:
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https://www.ann-geop...
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Subject headings
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- We present the results of a statistical study using optical images from ALIS (Auroral Large Imaging System) to investigate the spatial and temporal variations of structures in diffuse aurora. Analysis of conjugate Reimei data shows that such fine structures are a result of modulation of high-energy precipitating electrons. Pitch angle diffusion into the loss cone due to interaction of whistler mode waves with plasma sheet electrons is the most feasible mechanism leading to high-energy electron precipitation. This suggests that the fine structure is an indication of modulations of the efficiency of the wave-particle interaction. The scale sizes and variations of these structures, mapped to the magnetosphere, can give us information about the characteristics of the modulating wave activity. We found the scale size of the auroral stripes and the spacing between them to be on average 13-14 km, which corresponds to 3-4 ion gyro radii for protons with an energy of 7 keV. The structures move southward with a speed close to zero in the plasma convection frame.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Rymd- och flygteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Aerospace Engineering (hsv//eng)
Keyword
- Space Technology
- Rymdteknik
Publication and Content Type
- ref (subject category)
- art (subject category)
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