NUV/Blue spectral observations of sprites in the 320-460 nm region: ${\mathrm N_2}$ (2PG) Emissions

Details NUV/Blue spectral observations of sprites in the 320-460 nm region: ${\mathrm N_2}$ (2PG) Emissions NUV/Blue spectral observations of sprites in the 320-460 nm region: ${\mathrm N_2}$ (2PG) Emissions

2010-02-21

arxiv.org/abs/1002.3949v1

Physics

Geophysics

7 pages, 2 figures, 1 table, JGR Space Physics "Effects of Thunderstorms and Lightning in the Upper Atmosphere" Special Sectio

Scientific paper

A near-ultraviolet (NUV) spectrograph (320-460 nm) was flown on the EXL98 aircraft sprite observation campaign during July 1998. In this wavelength range video rate (60 fields/sec) spectrographic observations found the NUV/blue emissions to be predominantly N2 (2PG). The negligible level of N2+ (1NG) present in the spectrum is confirmed by observations of a co-aligned, narrowly filtered 427.8 nm imager and is in agreement with previous ground-based filtered photometer observations. The synthetic spectral fit to the observations indicates a characteristic energy of ~1.8 eV, in agreement with our other NUV observations.

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