Midlatitude diurnal variations of upper-atmospheric parameters

Computer Science – Sound

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Aeronomy, Diurnal Variations, Midlatitude Atmosphere, Rocket Sounding, Upper Atmosphere, Atmospheric Composition, Atmospheric Temperature, Ionospheric Electron Density, Solar Position

Scientific paper

The present paper considers the problem of generalizing sounding-rocket data, obtained in a large range of latitudes and in different seasons, for the purpose of describing the diurnal variation of upper-atmospheric parameters. It is shown that reference systems based on local time and solar zenith angle are not proper for such descriptions because of daily variations in the time of sunrise and sunset as well as latitudinal variations in solar zenith angle. A reference system free from these shortcomings is proposed which is based on moments of the day (e.g., sunrise, noon, sunset, midnight), expressed in degrees. Use of the proposed system is illustrated with an example in which diurnal variations in temperature and neutral composition at 180 km are plotted against moments of the day along with variations in electron density at 110 km.

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