Interplanetary Consequences of Coronal Mass Ejection Events occurred during 18--25 June 2015

TL;DR

This study reviews the propagation and interplanetary effects of major CME events in June 2015, highlighting their large-scale structures, propagation speeds, and particle acceleration impacts within the inner heliosphere.

Contribution

It provides new insights into CME propagation dynamics, shock formation, and particle acceleration during a specific solar event period.

Findings

CME-driven disturbances filled nearly the entire inner heliosphere.

CME speeds ranged from approximately 300 to 1000 km/s.

Proton flux increases indicate shock-driven particle acceleration.

Abstract

In this paper, we review the preliminary results on the propagation effects and interplanetary consequences of fast and wide coronal mass ejection (CME) events, occurred during 18--25 June 2015, in the Sun-Earth distance range. The interplanetary scintillation (IPS) images reveal that the large-scale structures of CME-driven disturbances filled nearly the entire inner heliosphere with a range of speeds, $\sim$300--1000 {\kmps}. The comparison of speed data sets, from IPS technique results in the inner heliosphere and {\it in-situ} measurements at 1 AU, indicates that the drag force imposed by the low-speed wind dominated heliosphere on the propagation of CMEs may not be effective. The arrival of shocks at 1 AU suggests that a shock can be driven in the interplanetary medium by the central part of the moving CME and also by a different part away from its centre. The increased flux of proton at energies $>$10 MeV is consistent with the acceleration of particles by the shock ahead of the CME.