Abstract
In this study, the Total Electron Content (TEC) variability over Asian-Australian low-latitude sector is investigated during the 2013 Sudden Stratospheric Warming (SSW) event that overlapped with a moderate geomagnetic storm. These investigations are about the latitudinal distribution of ionospheric TEC measured from 10 Global Positioning System (GPS) receivers along 115° E in the Asian-Australian sector. We used a pair of magnetometers to reveal the equatorial electrojet (EEJ) strength equivalent to the magnetometer-inferred \(E \times B\) drift. Also, the NASA Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite airglow instrument was used to unveil the changes in the neutral thermospheric \({{\text{O}} \mathord{\left/ {\vphantom {{\text{O}} {{{{\text{N}}}_{2}}}}} \right. \kern-0em} {{{{\text{N}}}_{2}}}}\) ratio during the event. The current work was compared with a similar investigation in the American sector. During SSW onset (7 January 2013), the northern EIA crest that moved poleward in the Asian-Australian sector contradicted the equatorward movement of the crest observed in the American sector. At both the Asian-Australian and American longitudes in mid-January, the poleward northern crests are at higher latitudes in the American longitude than in the Asian-Australian longitude. This longitudinal difference in mid-January was evident in significant enhancement of the magnetometer inferred upward-directed \(E \times B\) drift in the American sector compared to the Asian-Australian sector. Compared to the American sector, the moderate geomagnetic storm that overlapped the ongoing major SSW on 17 January 2013 did not significantly affect the Asian-Australian sector. The storm-time effect on the TEC on 18 January 2013 in the Asian-Australian sector reduced (increased) the SSW (photo-ionization) effect in the northern (southern) hemisphere.
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ACKNOWLEDGMENT
In this current study, the stratospheric, geomagnetic and solar activity data were retrieved from the websites of the NOAA Physical Sciences Laboratory (https://psl.noaa.gov), NASA OMNIweb service, https://omniweb.gsfc. nasa.gov/, and the National Oceanic and Atmospheric Administration (NOAA), solar data service at https://www.ngdc. noaa.gov/stp/solar/solardataservices.html respectively. The GPS-TEC data used are freely downloaded online via National Aeronautics and Space Administration (NASA) Archive of Space Geodesy Data (cddis.nasa.gov/archive/ gnss/data/) and SONEL (www.sonel.org). The magnetometer data were downloaded from the International Real-time Magnetic Observatory Network, INTERMAGNET (www.intermagnet.org). The thermospheric O/N2 column density data is optically obtained from NASA Thermosphere Ionosphere Mesosphere Energetics and Dynamics satellite (TIMED/GUVI) Far Ultraviolet (FUV) airglow instruments at http://guvitimed.jhuapl.edu. The authors appreciate all of these scientific organizations. Also, the authors thank Gopi Seemala for providing the GPS TEC processing software.
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Fashae, J.B., Bolaji, O.S. & Rabiu, A.B. Response of the Asian-Australian Low Latitude TEC to the 2013 SSW Event and a Moderate Geomagnetic Storm. Geomagn. Aeron. 63, 1–16 (2023). https://doi.org/10.1134/S0016793222600357
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DOI: https://doi.org/10.1134/S0016793222600357