J. Space Weather Space Clim.
Volume 9, 2019
|Number of page(s)||17|
|Published online||31 January 2019|
GNSS-based analysis of high latitude ionospheric response on a sequence of geomagnetic storms performed with ROTI and a new relative STEC indicator
University of Warmia and Mazury in Olsztyn, Oczapowskiego 2, 10-719 Olsztyn, Poland
* Corresponding author: email@example.com
Accepted: 6 January 2019
This contribution presents a combined analysis of the occurrence of polar patches and development of auroral oval triggered by a sequence of geomagnetic storms in March 2012. The detection of the patches was realized with relative slant TEC (STEC) values extracted from geometry-free combination using novel, iterative algorithm of 4-degree polynomial fitting. The proposed approach allows sensing of large structures with high temporal resolution, since it provides epoch-wise information on STEC enhancement in respect to the specified background level. The comparative analysis of the novel indicator with well-known Rate of TEC Index (ROTI) has shown that the new one ensures the more detailed view on patch propagation. The applicability of relative STEC values was also preliminary confirmed by their validation with plasma density data obtained from SWARM mission. The evolution of auroral oval, involving its expansion as well as the intensity of TEC fluctuation, was performed with ROTI parameter. The results of patch occurrence and oval expansion for different geomagnetic conditions are consistent with previous works what proves the feasibility of comprehensive global navigation satellite system (GNSS)-based analyses with the proposed methodology.
Key words: GNSS / polar patches / auroral oval / geomagnetic storm
© R. Sieradzki & J. Paziewski, Published by EDP Sciences 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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