Recurrent HSS/SIR forcing, CME activity, and F-region dynamics over Brazil: a wavelet-coherence study of August 2017
Gabriela Almeida Santos Moraes·Josiely Aparecida do Espírito Santo Toledo·Virgínia Klausner·Laura Luiz Trigo
This paper investigates the effects of geomagnetic disturbances that occurred in August 2017, during the declining phase of Solar Cycle 24, when two geomagnetic storms driven by high-speed stream (HSS) and stream interaction region (SIR) structures and associated with HILDCAA intervals took place on 4–6 August and 17–21 August, together with a coronal mass ejection (CME) embedded in the solar wind that impacted the Earth on 22–23 August. The focus of the study is the ionospheric response over th