Small-scale structures in flickering aurora
2008 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 35, no 23Article in journal (Refereed) Published
A state-of-the-art multispectral imager has been used to study the flickering component of an auroral event at high spatial (40 m) and temporal (32 fps) resolution. Scale sizes for the flickering patches were found to be regularly smaller than 1 km. The typical flickering frequency observed was in the range 6-8 Hz, although flickering patches at both lower and higher frequencies were identified. The flickering structure was correlated with the coincident non-flickering aurora, showing that although there is a temporal relationship between the two, there is no spatial correlation. These results support the theory that flickering structure is caused by interfering dispersive Alfven waves.
Place, publisher, year, edition, pages
2008. Vol. 35, no 23
aligned electron flux, ion-cyclotron waves
IdentifiersURN: urn:nbn:se:kth:diva-18049DOI: 10.1029/2008gl036134ISI: 000261668500006ScopusID: 2-s2.0-60149083110OAI: oai:DiVA.org:kth-18049DiVA: diva2:336095
QC 201005252010-08-052010-08-05Bibliographically approved