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Simultaneous imaging of aurora on small scale in OI (777.4 nm) and N(2)1P to estimate energy and flux of precipitation
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0003-2422-5426
2009 (engelsk)Inngår i: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 27, nr 7, s. 2881-2891Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Simultaneous images of the aurora in three emissions, N(2)1P (673.0 nm), OII (732.0 nm) and OI (777.4 nm), have been analysed; the ratio of atomic oxygen to molecular nitrogen has been used to provide estimates of the changes in energy and flux of precipitation within scale sizes of 100 m, and with temporal resolution of 32 frames per second. The choice of filters for the imagers is discussed, with particular emphasis on the choice of the atomic oxygen line at 777.4 nm as one of the three emissions measured. The optical measurements have been combined with radar measurements and compared with the results of an auroral model, hence showing that the ratio of emission rates OI/N2 can be used to estimate the energy within the smallest auroral structures. In the event chosen, measurements were made from mainland Norway, near Tromso, (69.6 N, 19.2 E). The peak energies of precipitation were between 1-15 keV. In a narrow curling arc, it was found that the arc filaments resulted from energies in excess of 10 keV and fluxes of approximately 7mW/m(2). These filaments of the order of 100 m in width were embedded in a region of lower energies (about 5-10 keV) and fluxes of about 3 mW/m(2). The modelling results show that the method promises to be most powerful for detecting low energy precipitation, more prevalent at the higher latitudes of Svalbard where the multispectral imager, known as ASK, is now installed.

sted, utgiver, år, opplag, sider
2009. Vol. 27, nr 7, s. 2881-2891
Emneord [en]
Ionosphere, Auroral ionosphere, Particle precipitation, Instruments and, techniques, electron-impact, cross-sections, atomic oxygen, excitation, emission
Identifikatorer
URN: urn:nbn:se:kth:diva-18655ISI: 000268622700024Scopus ID: 2-s2.0-75149181782OAI: oai:DiVA.org:kth-18655DiVA, id: diva2:336702
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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