Development of Specialized Radio Receiving Apparatus, Frequency Control and Data Recording Apparatus

摘要

Satellite signal reception is used to study the small and large local irregularities and time variation of total electron content in the ionosphere. Methods of simultaneously tracking different phase-locked frequencies at different locations are described insofar as they are related to precise measurements of amplitude and phase of signals which are propagated through the ionosphere. Detailed instruction of the system is given in a separate manual. Basic formulas are developed for interpretation of Faraday, dispersive Doppler and incidence angle measurements under the assumption of a curved earth and a curved ionosphere with local gradients in ionization. Contribution of curvature and ionization gradients is shown to be more important for computation of total electron content than high order approximation of the magnetic field. Theoretical investigations try to join different statistical approaches for the purpose of scintillation and drift measurements. Usefulness of a logarithmic amplitude scale for statistical analysis can be shown. Contribution in maintenance of a riometer network is also reported. (Author)