Modeling the solar cycle change in nitric oxide in the thermosphere and upper mesosphere

Details Modeling the solar cycle change in nitric oxide in the thermosphere and upper mesosphere Modeling the solar cycle change in nitric oxide in the thermosphere and upper mesosphere

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1559f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1559-1570.

Physics

12

Atmospheric Chemistry, Mesosphere, Nitric Oxide, Solar Activity Effects, Thermosphere, Atmospheric Models, Extreme Ultraviolet Radiation, Solar Cycles

Scientific paper

A 1D model is employed to investigate the response of nitric oxide in the thermosphere and upper mesosphere through the solar cycle and over a solar rotation period. The model assumes solar flux from the standard reference spectra, extended to 0.1 nm. A variation in the globally averaged peak NO density of a factor of 7 was produced over the solar cycle, in good agreement with the observations from SME. Much of the NO at the peak is shown to arise from the ionization of molecular nitrogen by the secondary electron spectrum, produced by XUV photons. The reaction of N(2+) with atomic oxygen proceeds to create N(D-2), which subsequently reacts with molecular oxygen to produce NO. The soft X-rays between 1.8 and 5.0 nm were shown to be important. An inferred change in this wavelength band, by a factor of 3 over a solar rotation, is shown to reproduce by a factor of 2 change in the peak NO density observed by SME.

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