Temporal and Spatial Variations of Total Electron Content Enhancements During a Geomagnetic Storm on 27 and 28 September 2017

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us), SWEPOS (ftp://ftp-sweposdata.lm.

se), EUREF (ftp://www.epncb.oma.be),

IGG (ftp://ftp.glonass-iac.ru), SUGAUR

(ftp://eos.ntu.edu.sg), NMA (ftp://ftp.

statkart.no), NERC (ftp://

128.243.138.204), RAMSAC (ftp://ramsac.ign.gob.ar), and ERGNSS (ftp://ftp.

geodesia.ign.es). The SuperDARN electric potential map data and analysis

software were provided by Virginia

Tech (http://vt.superdarn.org/tikiindex.php?page=ASCIIData).

SuperDARN is a collection of radars

funded by the national scientific funding agencies of Australia, Canada,

China, France, Italy, Japan, Norway,

South Africa, the United Kingdom, and

the United States of America. The ion

drift velocity data obtained from the

Jicamarca IS radar are provided by the

Madrigal Database (http://jro-db.igp.

gob.pe/madrigal/). The Jicamarca

Radio Observatory is a facility of the

Instituto Geofisico del Peru operated

with support from NSF AGS‐1433968

through Cornell University. We used

the 1‐min geomagnetic field data collected at Huancayo and Kourou. We

thank Instituto Geofisico del Perú and

Institut de Physique du Globe de Paris

for supporting its operation and

INTERMAGNET for promoting high

standards of magnetic observatory

practice (www.intermagnet.org). We

also analyzed ionogram data obtained

from four ionosonde stations (Austin,

Boulder, Juliusruh, and Rome). These

ionogram data were provided by Lowell

GIRO Data Center (LGDC) (https://

ulcar.uml.edu/DIDBase/). The

Juliusruh ionosonde has been operated

by the Leibniz Institute of Atmospheric

Physics Kuehlungsborn.

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