Simultaneous observations of small multi-scale structures in an auroral arc
2010 (English)In: Journal of Atmospheric and Solar-Terrestrial Physics, ISSN 1364-6826, Vol. 72, 633-637 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2010. Vol. 72, 633-637 p.
Auroral fine structure, Auroral curls and folds, Instruments and techniques, Plasma instabilities
Fusion, Plasma and Space Physics Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-24905DOI: 10.1016/j.jastp.2010.01.014ISI: 000277677300009ScopusID: 2-s2.0-77952956058OAI: oai:DiVA.org:kth-24905DiVA: diva2:354129
QC 201009302010-09-302010-09-302011-01-10Bibliographically approved