Electron energy and electric field estimates in sprites derived from ionized and neutral N2 emissions

Details Electron energy and electric field estimates in sprites derived from ionized and neutral N2 emissions Electron energy and electric field estimates in sprites derived from ionized and neutral N2 emissions

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j.100m&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 10, pp. 100-1, CiteID 1462, DOI 10.1029/2001GL014018

Physics

25

Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Meteorology And Atmospheric Dynamics: Lightning, Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

During the EXL98 aircraft mission, sprites and blue jets were observed by narrow band cameras that measure the N2+ 1NG (0,1) band at 4278Å and the N2 2PG (0,0) band at 3370Å. We discuss the observations (~1km resolution), instrumental and atmospheric corrections, and altitude profiles of ionized (1NG) and neutral (2PG) emission observed during a specific sprite. The ratio of ionized-to-neutral emission indicates a relative enhancement of ion emission below 55km. Characteristic electron energies (ECh) and electric fields (E) are derived from these emission ratios using excitation rates computed from a model that solves the Boltzmann equation as a function of electric field. Up to 55km E follows the breakdown field (Ek) and ECh is ~2.2eV. Above 55km E drops below Ek and ECh drops to ~1.75eV near 60km.

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