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Temporal and spatial variations of ionospheric total electron content during isolated substorms

Urheber*innen

Shinbori,  Atsuki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Otsuka,  Yuichi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sori,  Takuya
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nishioka,  Michi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Perwitasari,  Septi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Shinbori, A., Otsuka, Y., Sori, T., Nishioka, M., Perwitasari, S. (2023): Temporal and spatial variations of ionospheric total electron content during isolated substorms, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4029


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021469
Zusammenfassung
To clarify the characteristics of temporal and spatial development of ionospheric total electron content (TEC) enhancements and depletions from high to low latitudes as a function of substorm intensity, we analyzed long-term Global Navigation Satellite System (GNSS)-TEC data together with solar wind, interplanetary magnetic field, and AE and SYM data. For identification of substorm events for a period of 2000-2019, we used a list of substorm events derived from the SML index [Ohtani and Gjerloev, 2020]. Further, we calculated the maximum value of the AE index 2 hours after the onsets of substorms to determine the substorm intensity. According to the maximum AE value, we classified five categories: very weak (< 200 nT), weak (< 400 nT), moderate (< 600 nT), strong (< 1000 nT), and very strong (1000 nT) events. The statistical analysis clearly shows an increase and decrease of the ratio of the TEC difference (rTEC) [Shinbori et al., 2019] in pre-midnight (21–0 h MLT) and post-midnight (0–3 h MLT) at auroral latitudes (67o–74o MLAT) approximately 1 hour before the substorm expansions. The post-midnight rTEC depletion corresponds to the high-latitude trough [Rodger et al., 1992] and is mainly generated by the evacuation of downward FACs due to the enhancement of the nightside substorm current wedge [Zou et al., 2013]. For more than moderate substorm events, another rTEC enhancement appears in the afternoon sector (12–18 h MLT) from high to mid-latitudes (55o–75o MLAT), resembling an SED phenomenon as seen during geomagnetic storms.