Quasibiennial oscillations in some ionospheric parameters
Abstract
An analysis is conducted of the existence of quasibiennial oscillation (QBOs) parameters, which characterize the ionization composition of the daytime lower, middle, and upper ionosphere and are brought about by analogous oscillations of solar activity. Time variations of the period, amplitude, and phase of QBO in the sunspot activity, the green corona intensity, and the geomagnetic activity are analyzed. The period under investigation is the 1960-1983 interval. During this time, the QBO is found to have a wide oscillation period varying from 21 to 29 months; these oscillations are not random, but depend on such characteristics as the solar cycle phase, and the north-south asymmetry of solar activity. It is proposed that various periods, characterized by QBO, reflect a heightened dependency characteristic of QBO in the solar atmosphere where the X-ray and ultraviolet radiation are generated, and are responsible for the ionization of individual ionospheric levels.
- Publication:
-
Bulgarsko Geofizichno Spisanie
- Pub Date:
- 1990
- Bibcode:
- 1990BlGSp..16...44A
- Keywords:
-
- Atmospheric Ionization;
- Earth Ionosphere;
- Geomagnetism;
- Periodic Variations;
- Solar Activity Effects;
- Solar Atmosphere;
- Solar Corona;
- Sunspots;
- Ultraviolet Radiation