Ionospheric Research Using Satellites - The Equatorial Faraday Evening Minimum.
Interim scientific rept. 1 Jan-31 Dec 72,
GHANA UNIV LEGON DEPT OF PHYSICS
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A deep daily minimum in total electron content occurs a few hours after local sunset at Legon on most days during eight months of the year. This minimum can be explained in terms of an elliptical motion of ionization in the vertical E-W plane over the equator. It is suggested that the motion is caused by an electrostatic field, mapped into the F region along field lines from the dynamo region. The field is thought to be due to an accumulation of negative charge in a band just east of the sunset line in the E region. The mechanism described by Carlson and Walker 1972 is suggested as the cause for the field. The electrostatic field and its accompanying elliptical circulation moves westward with the speed of the sunset line 490 ms. A computer model based on this mechanism produces results comparable with those obtained experimentally. The production of irregularities giving rise to spread F and scintillation is closely associated with this elliptical circulation. Author
- Atmospheric Physics
- Radiofrequency Wave Propagation