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《Chinese Journal of Geophysics》 1990-01
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NUMERICAL SIMULATION OF 2-DAY OSCILLATION OF EQUATORIAL ANOMALY

ZHOU LI-QUN CHEN PEI-REN(Center for Space Science and Applied Research, Academia Sinica ,Beijing)  
For the past two decades, investigators have not considered the modulation effects of planetary waves to tidal dynamo in their numerical studies of equatorial anomaly, hence they could not explain the day-to-day variations of the peak values of the equatorial anomaly. This paper mainly deals with the problem of 2-Day wave modulation to the equatorial anomaly. Results show a significant influence of 2-Day wave to the ionization transport in the F2 region. Methods involved may be developed to the numerical investigations of equatorial anomaly in which planetary waves are taken into account.In this paper an equation in which modulation effect of planetary wave oscillation to the E X B drift is included is developed from the time dependent plasma continuity -equation. Numerical methods and results comparable to the observational facts are also presented. Drift amplitude of diurnal wave is taken to be Us=20m/s. Dxift amplitudes and initial phases of planetary waves are chosen respectively as Up = 0; Up = 5m/s, (?)p = 0°; Up = 5m/s, (?)p = 90° and Up = 10m/s, (?)p = 0° for simulation. Results show an obvious 2-Day fluctuation in temporal and spatial distributions of the equatorial anomaly under the moxlulation of 2-Day waves. In the framework of the chosen models above, the one, Up = 5m/s, (?)p = 0° gives a 2-Day distributions more comparable to observations. Conclusions are also obtained from the results that 5m/s variation in Up make the anomaly peak values of f0F2 1-2 MHz fluctuations while the peak values within two days perform a fluctuations of 2-4MHz.
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1 CHEN PEI-REN(Centre of Space Science and Applied Research, Academia Sinica, Beijing);SYNCHRONOUS PLANETARY-SCALE OSCILLATION OF THE NEUTRAL WIND AND PLASMA[J];Chinese Journal of Geophysics;1989-02
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