Observation of O+ 4P-4D0 lines in proton aurora over Svalbard

Spectra of a proton aurora event show lines of O+ 4P-4D0 multiplet (4639–4696 Å) enhanced relative to the N2 +1N(0,2) compared to normal electron aurora. Conjugate satellite particle measurements are used as input to electron and proton transport models, to show that p/H precipitation is the dominan...

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Bibliographic Details
Main Authors: Ivchenko, N., Galand, M., Lanchester, B.S., Rees, M.H., Lummerzheim, D., Furniss, I., Fordham, J.
Format: Article in Journal/Newspaper
Language:English
Published: 2004
Subjects:
Svalbard
Online Access:https://discovery.ucl.ac.uk/id/eprint/9534/1/2003GL019313.pdf
https://discovery.ucl.ac.uk/id/eprint/9534/
Description
Summary:Spectra of a proton aurora event show lines of O+ 4P-4D0 multiplet (4639–4696 Å) enhanced relative to the N2 +1N(0,2) compared to normal electron aurora. Conjugate satellite particle measurements are used as input to electron and proton transport models, to show that p/H precipitation is the dominant source of both the O+ and N2 +1N emissions. The emission cross-section of the multiplet in p collisions with O and O2 estimated from published work does not explain the observed O+ brightness, suggesting a higher emission cross-section for low energy p impact on O.

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