Abstract
The large amount of data that are available for ionospheric studies using the GPS TEC method, as well as the need to take into account complex atmospheric dynamics, create certain difficulties in automating the process of searching and recognizing traveling ionospheric disturbances generated by different sources. To automate the process of detecting wave disturbances, numerical criteria for assessing the level of the wave disturbance signal were proposed. The signal-to-noise ratio calculated by the proposed method was used as one of such criteria. This work contains a description of the developed software system that implements the proposed methodology and allows the loading of RINEX files and processing, analyzing, and visualizing total electron content data.
Highlights
In the field of studying traveling ionospheric disturbances (TIDs) based on totalIn thecontent field ofdata studying traveling disturbances (TIDs)the based on total electron obtained usingionosphericGNSS receivers (GPS total electron content (TEC)), method of electron content data obtained usingGNSS receivers (GPSTEC), the method of constructing constructing hodochrones has proved to be the most successful [1,2]
The essence of this hodochrones proved to be the most successful. The essence this method is to method is to has construct three-dimensional diagrams, in which time is of plotted along the xconstruct three-dimensional diagrams, in which time is plotted along the x-axis, distance axis, distance is plotted along the y-axis, and the color value corresponds to variations in is plotted along the y-axis, and the color value corresponds to variations in the total the total electron content (TEC) after filtering low frequencies
The developed software system for monitoring TIDs based on GNSS data is at the testing stage, but it is already being used to detect regular disturbances of the ionosphere generated by the passage of the solar terminator, as well as sporadic disturbances generated by earthquakes and solar activity
Summary
In the field of studying traveling ionospheric disturbances (TIDs) based on totalIn thecontent field ofdata studying traveling disturbances (TIDs)the based on total electron obtained usingionosphericGNSS receivers (GPS TEC), method of electron content data obtained usingGNSS receivers (GPSTEC), the method of constructing constructing hodochrones has proved to be the most successful [1,2]. The essence of this hodochrones proved to be the most successful [1,2] The essence this method is to method is to has construct three-dimensional diagrams, in which time is of plotted along the xconstruct three-dimensional diagrams, in which time is plotted along the x-axis, distance axis, distance is plotted along the y-axis, and the color value corresponds to variations in is plotted along the y-axis, and the color value corresponds to variations in the total the total electron content (TEC) after filtering low frequencies. Electron content (TEC) after filtering low frequencies In this case, the “distance” coordinate coordinate corresponds to either the radial distance from the central source of corresponds to either the radial distance from the central source of disturbances (for disturbances (for example, the epicenter of an earthquake), or the distance along a certain example, the epicenter of an earthquake), or the distance along a certain direction in the direction in the case of a plane wavefront. Wave disturbances from a common source form a source form a coherent wave pattern (Figure 1)
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