Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407810k&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 7, CiteID L07810
Physics
24
Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Ionosphere: Ion Chemistry And Composition (0335), Atmospheric Processes: Atmospheric Electricity, Atmospheric Processes: Lightning
Scientific paper
Altitude resolved sprite spectra have been obtained with an imaging slit spectrograph with 3 ms temporal and ~3 nm spectral resolution. Spectral coverage is from 640 to 820 nm. The slit was vertical to provide altitude resolution. The observed spectra are exclusively composed of emissions from the N2 first positive (1PG) bands. There are no obvious N2 + Meinel emissions, probably due to a combination of quenching and rapid motion of the streamer heads in which ionization is assumed to take place. The spectral analysis shows that the vibrational population in the upper state of the 1PG bands, N2 B 3Π g state, varies with altitude and is similar to that of laboratory afterglow at high pressure. This result suggests that secondary interactions among excited states created by electron impact may also play a role in exciting the B 3Π g state.
Kanmae Takeshi
McHarg Matthew G.
Stenbaek-Nielsen Hans C.
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