Studying characteristics of traveling ionospheric disturbances using U-shaped traces on vertical incidence ionograms |
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Authors: | O Laryunin |
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Institution: | Institute of Solar-Terrestrial Physics of Siberian Branch of the Russian Academy of Sciences, No 126a Lermontov st., Irkutsk, Russia |
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Abstract: | This paper presents a case study when due to the descending additional U-shaped trace on vertical incidence ionograms, increased critical frequency stabilizes. This corresponds to an ionospheric disturbance that moves toward the ionosonde and then stays overhead.Within a 2D model, traveling ionospheric disturbances (TIDs) are superimposed on the inverted background ionosphere. So ray tracing is used to obtain propagation paths through non-stratified ionosphere thus synthesizing the disturbed ionogram traces. Investigated are changes in the cusp shape caused by varying TID parameters. A cusp-fitting method to determine the TID amplitude, spatial scale, and horizontal drift velocity are shown. |
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Keywords: | Vertical incidence ionograms Traveling ionospheric disturbances Numerical ray tracing |
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