Generation of metastable oxygen atom O(1D) in sprite halos

Details Generation of metastable oxygen atom O(1D) in sprite halos Generation of metastable oxygen atom O(1D) in sprite halos

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3114105h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 14, CiteID L14105

Physics

Plasma Physics

10

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Lightning, Space Plasma Physics: Ionization Processes

Scientific paper

We propose a nighttime source of metastable oxygen atoms O(1D) in the mesosphere. Here O(1D) atoms are generated by electron impact dissociation of O2 molecules in sprite halo events, where electrons are accelerated in strong electric fields associated with lightning discharges. The peak production rate of O(1D) in a single sprite halo event is estimated to be as large as 104 cm-3 for a duration of 1 ms, which is comparable to, or even larger than, the steady rate by solar-UV radiation. We also discuss the altitude dependence of O(1D) production in sprite halos and the dependence on day and night.

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