| Titre | Temporal and spatial variations of GPS TEC and phase during auroral substorms and breakups |
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| Auteur | Prikryl, P; Weygand, J M; Ghoddousi-Fard, R; Jayachandran, P T; Themens, D R; McCaffrey, A M; Kunduri, B S R; Nikitina, L |
| Source | Polar Science 100602, 2020 p. 1-17, https://doi.org/10.1016/j.polar.2020.100602 |
| Image |  |
| Année | 2020 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20200486 |
| Éditeur | Elsevier |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/j.polar.2020.100602 |
| Media | papier; en ligne; numérique |
| Formats | pdf; html |
| Province | Canada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon;
Nunavut |
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| Lat/Long OENS | -141.0000 -50.0000 90.0000 41.7500 |
| Sujets | géodésie par satellite; ionosphère; courants ionosphériques; orages magnétiques; champs géomagnétiques; magnétomètres; réseaux géodésiques; photographie; Système de positionnement global; géophysique;
Sciences et technologie; Nature et environnement |
| Illustrations | cartes de localisation; photographies; séries chronologiques; images numériques; cartes géolscientiques généralisées; images satellitaires |
| Diffusé | 2020 10 09 |
| Résumé | (disponible en anglais seulement)
Temporal and spatial changes of GPS total electron content (TEC) and phase variation, called phase scintillation, during auroral substorms and breakups are
investigated in the context of horizontal equivalent ionospheric currents and estimated vertical current amplitudes derived from ground magnetometer network using the spherical elementary current method. GPS phase scintillation is computed for
sampling rate of 50 Hz by specialized GPS scintillation receivers from the Canadian High Arctic Ionospheric Network (CHAIN). A proxy phase scintillation index is obtained from dual frequency measurements of geodetic-quality GPS receivers sampling at
1 Hz, which include globally distributed receivers of RT-IGS network that are monitored by the Canadian Geodetic Survey in near-real-time. Based on analysis of four cases, it is shown that GPS phase scintillation maps to regions of strong westward
electrojet and to the poleward edge of the eastward electrojet. For substorm onsets, auroral breakups and substorm intensifications, the ionospheric pierce points with moderate to strong phase scintillation associated with TEC enhancements map to
regions of intense westward electrojet interfacing with the eastward electrojet near the boundaries between downward Region 1 and upward Region 1/Region 2 currents in the Harang discontinuity region, where intense auroral emission was observed for
some of the cases studied. Energetic particle precipitation in this dynamic region results in steep electron density gradients and drifting irregularities that are the cause of GPS phase variation. |
| GEOSCAN ID | 327400 |
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