Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa52a..11s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA52A-11
Physics
0335 Ion Chemistry Of The Atmosphere (2419, 2427), 2419 Ion Chemistry And Composition (0335), 7538 Solar Irradiance
Scientific paper
A common view of the E region ionosphere is that O2+ is the major ion at low and middle latitudes, with NO+ becoming dominant only at auroral latitudes where higher levels odd nitrogen convert O2+ to NO+. However, in-situ rocket measurements by several different groups extending back to 1960 have consistently found that the NO+ density is either greater than or approximately equal to O2+ throughout the E region. Until recently, ionospheric models have been unable to reproduce these observations. New measurements have forced a revision of these models. The solar X-ray photometer on the Student Nitric Oxide Explorer (SNOE) satellite has observed higher than expected solar irradiance in the soft X-ray region of the spectrum. This causes higher levels of nitric oxide, as observed by the SNOE ultraviolet spectrometer and by HALOE on the Upper Atmosphere Research Satellite. The effect of these revisions on models of the non-auroral E region is to change the ion composition from predominantly O2+ to NO+, in better agreement with observations. This paper will review the measurements, show new model results, and examine the solar cycle and latitudinal dependence of E region ion composition.
Bailey Scott M.
Siskind David E.
Solomon Stanley C.
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