Consequences of a Solar Wind Stream Interaction Region on the Low Latitude Ionosphere: Event of 7 October 2015
| Autor: | E. Zuccheretti, Jorge Habib Namour, Maria Graciela Molina, Sergio Dasso, Miguel Angel Cabrera, Gustavo Adolfo Mansilla |
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| Rok vydání: | 2020 |
| Předmět: |
Ionospheric storm
Geomagnetic storm Physics 010504 meteorology & atmospheric sciences Magnetosphere Astronomy and Astrophysics Geophysics 01 natural sciences Physics::Geophysics Solar wind Earth's magnetic field Space and Planetary Science Physics::Space Physics 0103 physical sciences Coronal mass ejection Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Ionosphere Interplanetary spaceflight 010303 astronomy & astrophysics Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | Solar Physics. 295 |
| ISSN: | 1573-093X 0038-0938 |
| Popis: | In this article, we present a study of the perturbations occurring in the Earth’s environment on 7 October 2015. We use a multi-instrument approach, including space and ground observations. In particular, we study the ionospheric conditions at low latitudes. Two ionospheric storms are observed at the low latitude station of Tucuman ( $26^{\circ}$ $51'$ S, $65^{\circ}$ $12'$ W). We observe a negative ionospheric storm followed by a positive one. These ionospheric perturbations were triggered by two sudden storm commencements (SSCs) of a strong geomagnetic storm. Preliminary results show that the main mechanism involved in both ionospheric storms is the prompt penetration of electric fields (PPEFs) from the magnetosphere. Furthermore, in the positive storm, disturbed dynamo electric fields are observed acting in combination with the PPEFs. The impact of the solar wind on the Earth’s environment is analyzed using geomagnetic data and proxies, combined with data acquired in the Tucuman Low Latitude Observatory for the Upper Atmosphere. We also investigate the solar and interplanetary drivers of this intense perturbation. We find that, although typically interplanetary coronal mass ejections (ICMEs) are the most geoeffective transient interplanetary events, in this case, a corotating interaction region (CIR) is responsible for these strong perturbations to the geospace. |
| Databáze: | OpenAIRE |
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