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Spatial characteristics of wave-like structures in diffuse aurora obtained using optical observations
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
Swedish Institute of Space Physics / Institutet för rymdfysik.
Swedish Institute of Space Physics / Institutet för rymdfysik.
Swedish Institute of Space Physics / Institutet för rymdfysik.
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2012 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 30, no 12, 1693-1701 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 30, no 12, 1693-1701 p.
National Category
Aerospace Engineering
Research subject
Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-10503DOI: 10.5194/angeo-30-1693-2012Local ID: 950b6a55-89db-44d6-8b63-a7d3c4e64052OAI: oai:DiVA.org:ltu-10503DiVA: diva2:983448
Note
Validerad; 2013; 20130102 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-10-19Bibliographically approved

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