Sprite Spectra at 10,000 fps

Details Sprite Spectra at 10,000 fps Sprite Spectra at 10,000 fps

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmae13a0302k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #AE13A-0302

Astronomy and Astrophysics

Astronomy

3304 Atmospheric Electricity, 3324 Lightning

Scientific paper

Recent high-speed recordings of sprites have revealed that sprites start from a downward point-like streamer head followed by a columniform diffuse glow along the trail. Since these features are essentially optical point and line sources, it is possible to make spectroscopic measurement with slit-less spectrograph techniques commonly used in astronomy. The combination of our high-speed imager with slit-less spectrograph technique has provided higher spatial and temporal resolution than previous spectroscopic observations. We have recorded spectra of streamer head and of the associated diffuse glow separately at 10,000 frames- per-second. The observations were made from the Langmuir Laboratory, NM, in June 2007. The slitless spectrograph has a spectral resolution of about 3 nm within the 400-900 nm wavelength coverage. The spectra are primarily from molecular nitrogen 1PG band emissions as previously observed. Neither N2+ 1NG nor N2 2PG band emissions in the blue were detected presumably due to Rayleigh scattering along relatively long path in excess of 500 km. The diffuse glow spectra show temporal variation in the (4, 2) band mission. This may indicate that collisional processes play a role in exciting the N2 B 3Πg state in diffuse glow.

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