Consequences of a solar wind stream interaction region on the low latitude ionosphere: Event of 7 October 2015

DASSO, S.; CABRERA, E.; MOLINA, M.G.; NAMOUR, J.H.; MANSILLA, G.; ZUCCHERETTI E.

SOLAR PHYSICS

SPRINGER

Lugar: Berlin; Año: 2020 vol. 295

0038-0938

In this paper, we present a study of the perturbations occurring on the space environment of Earth on07 October 2015, with a multi-instrument approach, including space and ground observatories.In particular, we study the ionospheric conditions at low latitudes. Two ionospheric storms areobserved at the low latitude station of Tucumán (26° 51´ S, 65° 12´ W). We observe a negativeionospheric storm followed by a positive ionospheric storm. The impact of the solar wind on theEarth?s environment is analyzed using geomagnetic data and proxies, combined with data acquiredin the "Tucumán Low Latitude Observatory for Upper Atmosphere". Tucumán exhibits two majorfeatures with great interest related to the impact in space weather events: it is located under the southcrest of the equatorial ionization anomaly and near the SAMA (South Atlantic Magnetic Anomaly).Thus, the impact over Tucumán?s ionosphere has an special interest for regional space weathermonitoring and its consequences over society activities (e.g. impacts on telecommunications, GNSSsystems, other space-based technologies, etc).We also investigate the solar and interplanetary driver of this intense perturbation. We find that, evenwhen typically Interplanetary Coronal Mass Ejections (ICMEs) are the most geo-effective transientinterplanetary events, in this case, a Co-rotating Interaction Region (CIR) is the main responsible forthese strong perturbations to the geo-space.