Campaign event from Sun to Earth, and consequences on the ionosphere of Tucumán, Argentina

The Sun-Earth coupling has significant consequences on several physical systems in the heliosphere, involving significantly different spatial-time scales. A multidisciplinary approach is necessary to understand the full chain of coupled processed.In this work, we carry out a study over the main processes associated to one space weather event, we identify the essential keys from its genesis at Sun to its impact on the terrestrial environment, in particular on the ionosphere, where we evaluate the event response by using multiple instruments, including both in situ and remote measurements.Data acquired by space probes have been used to study the solar origin of the transient, as well as its transport in the interplanetary medium. These data have been combined with the ones acquired in the "Tucumán Low Latitude Observatory for Upper Atmosphere" (26° 51' S, 65° 12' W) to study consequences on the low latitude ionosphere. The main aim of this study is to analyze disturbances in low latitude ionosphere occurred when it is forced by an interaction between solar wind and terrestrial magnetosphere under the presence of a space storm in the geospace. The event we analyze here is associated with a coronal hole, placed near the solar equator, with fast streams of plasma directed towards Earth between 3 and 5 of October, 2015. This event developed an intense geomagnetic storm on October 7th 2015 having a sudden commencement in the early hours that day. The geomagnetic storm reached a Dst index of -124 nT around 23 UTC. Preliminary results showed that, associated with this geomagnetic storm, an ionospheric storm occurred over Tucuman. We observe a negative ionospheric storm followed by a positive ionospheric storm in coincidence with the minimum value of Dst.