Variations of the main ionospheric trough location based on global and regional ionospheric maps and low-orbital radiotomography
Abstract
The main ionospheric trough (MIT) being among the most important structural features of subauroral region significantly affects the operation of different radio systems, which performance depends on the transionospheric channel, including HF-communications, satellite precise positioning and remote sensing. This attaches steady interest in both the experimental and numerical studies of MIT variability.
In this work we study variations of the location of MIT minimum under geomagnetically quiet winter conditions for the European and American longitudinal sectors of the northern hemisphere. For our study we use two datasets. The first is the global and regional ionospheric maps based on GNSS data, and the second is the low-orbital radiotomography data from two receiving arrays, Gakona-Delta and Moscow-Svalbard in the American and European sectors respectively. Both datasets cover almost two recent solar cycles and provide sufficient temporal and spatial resolution to study MIT variability. The first dataset was used to construct multiparametric regression model for the MIT minimum location, while the second one was used to independently verify the model. Our results generally show good consistency in MIT minimum location for both datasets. We also present and discuss solar activity dependence and longitudinal effect in MIT minimum location based on the considered data. We are grateful to NorthWest Research Associates for the Gakona-Delta array data and acknowledge financial support of Russian Foundation for Basic Research (project 19-05-00941) and Russian Science Foundation (project 17-7720087).- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSA43C3239P
- Keywords:
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- 2427 Ionosphere/atmosphere interactions;
- IONOSPHERE;
- 2435 Ionospheric disturbances;
- IONOSPHERE;
- 2736 Magnetosphere/ionosphere interactions;
- MAGNETOSPHERIC PHYSICS;
- 2794 Instruments and techniques;
- MAGNETOSPHERIC PHYSICS