Simultaneous observations of small multi-scale structures in an auroral arc |
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| Authors: | H Dahlgren A Aikio K Kaila N Ivchenko BS Lanchester DK Whiter GT Marklund |
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| Institution: | 1. Space and Plasma Physics, Royal Institute of Technology, Stockholm, Sweden;2. Department of Physical Sciences, University of Oulu, Finland;3. Space Environment Physics Group, University of Southampton, UK;1. Department of Communication Engineering and Informatics, University of Electro-Communications, Tokyo 182-8585, Japan;2. Center for Space Science and Radio Engineering, University of Electro-Communications, Tokyo 182-8585, Japan;3. Department of Geophysics, Kyoto University, Kyoto 606-8502, Japan;4. National Institute of Polar Research, Tokyo 190-8518, Japan;5. Department of Polar Science, SOKENDAI (Graduate University for Advanced Studies), Kanagawa 240-0193, Japan;1. SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China;2. CAS Key Laboratory of Basic Plasma Physics, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 230026, China;1. Department of Physical and Chemical Sciences, University of L’Aquila, 67100 L’Aquila, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, 00143 Rome, Italy;3. Università della Calabria, Dipartimento di Fisica, Rende, CS 87036, Italy;4. Consorzio Area di Ricerca in Astrogeofisica, University of L’Aquila, 67100 L’Aquila, Italy;5. SpacEarth Techonology, 00143 Rome, Italy;1. University of Texas at San Antonio, San Antonio, TX 78249, United States;2. Southwest Research Institute, San Antonio, TX 78238, United States;1. European Space Astronomy Centre, European Space Agency, Madrid, Spain;2. Institute of Space Systems, University of Stuttgart, Germany;3. Department of Astronomy, University of Maryland, College Park, MD, USA |
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| Abstract: | Auroral arcs can develop small-scale distortions known as vortex streets or curls. Other common and somewhat larger spatially periodic distortions are auroral folds. In this event study we present simultaneous wide and narrow field imager observations of a third kind of structuring, on even smaller spatial scales. Boundary undulations, or “ruffs”, have been observed to form on the edge of an auroral arc and they occur superimposed on curls, folds or at times of auroral shear. The undulations typically have wavelengths of less than 3 km and amplitudes of less than 800 m. They are observed to move on the edge of the arc, with velocities of about 11 km/s. These observations, with multi-scale deformations, reveal a much more intricate structuring of auroral arcs than previously found. |
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