Studies on dynamics of the equatorial ionosphere a thesis submitted for the degree of Doctor of Philosophy in the faculty of science, Bangalore University K. B. Ramesh [Ph.D Thesis]
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Thesis Supervisor J Hanumath Sastri
Doctor of Philosophy Bangalore University , Bangalore 1994
This thesis focuses on the dynamical behaviour of the equatorial F-region with particular reference to the vertical drifts and its temporal fine structure. Vertical drifts are important in understanding the dynamics of the ionospheric F-region in the vicinity of the dip equator because of the orthogonally oriented zonal electric and earths magnetic field there that cause the vertical drifts. Variation in the vertical drift can be caused by perturbations in electric or magnetic fields or in both. Studies on perturbations in the zonal electric fields, the data of which when analysed in conjunction with the other parameters such as auroral electrojet indices (AE) will give an insight into the magnetosphere- ionosphere coupling processes. Once acquired on large scale the vertical drift data will provide the understanding of its morphological features.
The plan is to identify the physical of processes that cause the small scale structures in the equatorial F-region vertical plasma drifts and to understand the perturbations in vertical drifts that occur in association with magneto- spheric substorms. The HF phase path sounder (Doppler radar) is a resource ful ground based experiment for studying the dynamical behaviour of the iono- spheric regions. The author had participated in the installation of the phase path sounder and in the observations. He also made major contributions to the augmentation of the system for multi- height/ multi-frequency recordings and developed the software required for off-line processing of the data on main frame computers such as Mighty Frame II, VAX-ll/780. The present the- sis is based on data from the phase path sounder experiment and also from the ionosonde. Both these experiments are operated at the equatorial station, Kodaikanal (Dip 3°N) in the Indian equatorial zone.
The thesis consists of six chapters. The present day understanding of some of the F -region processes relevant to the thesis is presented briefly in the first chapter. The details of the phase path sounder experiment, the system design, observational procedure and the method of analysis are presented in the second chapter. The results of the studies made on the basis of the data obtained from the above mentioned experiments in respect of the dynamics of the equatorial
F-region are presented in the 3Td , 4th and 5th chapters. A summary of the results obtained from the present work and the scope for further investigations are presented in the sixth chapter.
This thesis is an outcome of the research work carried out in the area of Solar-Terrestrial Physics at Indian Institute of Astrophysics, Bangalore, India.
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