Longitudinally asymmetric transport of nitric oxide in the E-region

Computer Science – Sound

Scientific paper

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Abundance, E Region, Nitric Oxide, Rocket Sounding, Thermosphere, Transport Properties, Atmospheric Chemistry, Northern Hemisphere, Southern Hemisphere, Summer, Winter

Scientific paper

Rocket and satellite studies have demonstrated that nitric oxide (NO) in the thermosphere is almost always more abundant at higher than at lower latitudes. The ultraviolet nitric oxide spectrometer (UVNO) on the Atmosphere Explorer C (AE-C) spacecraft observed longitudinal asymmetries in thermospheric NO with greater abundances existing in the longitudinal sector associated with the magnetic poles of both hemispheres. This asymmetry persists even in geomagnetic coordinates. In this paper, an explanation for the longitudinal asymmetry is suggested, using neutral parcel trajectories calculated from the NCAR thermospheric general circulation model (TGCM). It is evident from a study of these calculated trajectories that certain longitudes are favored for equatorward transport out of the auroral zone in the E-region. These favored longitudes are those associated with the magnetic poles, where NO is most abundant.

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