Multispectral observations of auroral rays and curls
2005 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 32, no 18Article in journal (Refereed) Published
Two cases of discrete aurora are presented, in which auroral curls and auroral rays, respectively, were seen. The aurora was imaged by two spatially separated imagers with a long-pass filter ( mainly sensitive to N-2 and N-2(+) emissions), and another imager with a narrow- band 7325 angstrom filter ( sensitive to forbidden O+ doublet). Also, spectra of the aurora were recorded. Using the multispectral imaging and spectra we find that the curls occurred in aurora caused by precipitation of energetic electrons with a lack of low-energy population, while in the rays both high and low energy precipitation were present simultaneously. These findings are confirmed by the altitude determination from triangulation.
Place, publisher, year, edition, pages
2005. Vol. 32, no 18
alfven waves, arc, distortions, emissions
IdentifiersURN: urn:nbn:se:kth:diva-15087DOI: 10.1029/2005gl022650ISI: 000232394600001ScopusID: 2-s2.0-27744456110OAI: oai:DiVA.org:kth-15087DiVA: diva2:333128
QC 201005252010-08-052010-08-05Bibliographically approved