Peculiar features of the low-latitude and midlatitude ionospheric response to the St. Patrick's Day geomagnetic storm of 17 March 2015

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Title:	Peculiar features of the low-latitude and midlatitude ionospheric response to the St. Patrick's Day geomagnetic storm of 17 March 2015
Authors:	蔡龍治;Nayak, Chinmaya;Tsai, L.‐C.;Su, S.‐Y.;Galkin, I. A.;Tan, Adrian Teck Keng;Nofri, Ed;Jamjareegulgarn, Punyawi
Contributors:	太空及遙測研究中心
Keywords:	Asymmetry;Compressive strength;Density;Electric fields;Equatorial ionization anomaly;equatorial ionosphere;geomagnetic storm;Geomagnetism;Geophysics;Ionization;Ionosondes;Ionosphere;Ionospheric storms;Ionospherics;Latitude;Longitude;Magnetic fields;Magnetic storms;midlatitude density trough;negative storm phase;Penetration;Phase shift;Plasmapause;Recovery;Solar cycle;Space weather;Storms;Studies;Total Electron Content
Date:	2016-08-01
Issue Date:	2026-04-21 14:40:45 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: American Geophysical Union (AGU)
Abstract:	摘要： AbstractThe current study aims at investigating and identifying the ionospheric effects of the geomagnetic storm that occurred during 17–19 March 2015. Incidentally, with SYM‐H hitting a minimum of −232 nT, this was the strongest storm of the current solar cycle 24. The study investigates how the storm has affected the equatorial, low‐latitude, and midlatitude ionosphere in the American and the European sectors using available ground‐based ionosonde and GPS TEC (total electron content) data. The possible effects of prompt electric field penetration is observed in both sectors during the main phase of the storm. In the American sector, the coexistence of both positive and negative ionospheric storm phases are observed at low latitudes and midlatitudes to high latitudes, respectively. The positive storm phase is mainly due to the prompt penetration electric fields. The negative storm phase in the midlatitude region is a combined effect of disturbance dynamo electric fields, the equatorward shift of the midlatitude density trough, and the equatorward compression of the plasmapause in combination with chemical compositional changes. Strong negative ionospheric storm phase is observed in both ionosonde and TEC observations during the recovery phase which also shows a strong hemispherical asymmetry. Additionally, the variation of equatorial ionization anomaly as seen through the SWARM constellation plasma measurements across different longitudes has been discussed. We, also, take a look at the performance of the IRI Real‐Time Assimilative Mapping during this storm as an ionospheric space weather tool. 出版者： Washington: American Geophysical Union (AGU) 出版日期： 2016-08 出處： Journal of Geophysical Research: Space Physics, 2016-08, Vol.121 (8), p.7941-7960 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2016. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2016ja022489
Appears in Collections:	[Center for Space and Remote Sensing Research ] journal & Dissertation

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