Distortions of the winter nighttime ionosphere at L = 4

Details Distortions of the winter nighttime ionosphere at L = 4 Distortions of the winter nighttime ionosphere at L = 4

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.3223m&link_type=abstract

Journal of Geophysical Research, vol. 82, Aug. 1, 1977, p. 3223-3232.

Computer Science

Sound

2

F Region, Ionospheric Disturbances, Night Sky, Winter, Computerized Simulation, Geomagnetic Latitude, Ionospheric Electron Density, Ionospheric Sounding, Isis-B, Vertical Distribution

Scientific paper

The winter nighttime ionosphere at L = 4 reveals frequent increases in F-region peak density (N) accompanied by a constant or declining total electron content (TEC). This effect is examined statistically by using two winter periods of simultaneous TEC and N data and 24 years of December foF2 observations. The month of December 1971 was chosen for a detailed analysis. Two nights, December 9 and 15, were used in simulation attempts to identify the conditions needed to account for the increasing N-constant TEC effect. For each case study, Isis 2 topside-sounder interpolated data on electron density height profile and electron density height profiles from ground-based ionosondes were combined with simultaneous TEC measurements to form a semiempirical computer model for electron density height profile versus latitude from h = 0 to geostationary-satellite height. The results indicate that vertical distortions of the electron density height profile over a wide latitude range are needed to reproduce the increasing N-constant TEC effect. The mechanism causing these distortions is still poorly understood. It is suggested that substorm-enhanced westward electric fields induce a lowering of the F layer during which air-drag effects may permit a buildup of plasma at the maximum height before enhanced loss processes take over.

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