Journal
ADVANCES IN SPACE RESEARCH
Volume 67, Issue 3, Pages 1085-1089Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.asr.2020.11.007
Keywords
Vertical incidence ionograms; Traveling ionospheric disturbances; Numerical ray tracing
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Funding
- Basic Research program 11.12
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This study used ray tracing to simulate traveling ionospheric disturbances in a non-stratified ionosphere, investigated changes in ionogram traces due to disturbances, and demonstrated a method for determining TID parameters.
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. (C) 2020 COSPAR. Published by Elsevier Ltd. All rights reserved.
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