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The large-scale magnetic cloud such as coronal mass ejections (CMEs) is thefundamental driver of the space weather. The interaction of the multiple CMEsin interplanetary space affects their dynamic evolution and geo-effectiveness.The complex and merged multiple magnetic clouds appear as the in-situ signatureof the interacting CMEs. The Alfven waves are speculated to be one of the majorpossible energy exchange/dissipation mechanism during the interaction. However,no such observational evidence has been found in the literature. The casestudies of CME-CME collision events suggest that the magnetic and thermalenergy of the CME is converted into the kinetic energy. Moreover, the magneticreconnection process is justified to be responsible for the merging of multiplemagnetic clouds. Here, we present unambiguous evidence of sunward torsionalAlfven waves in the interacting region after the super-elastic collision ofmultiple CMEs. The Walen relation is used to confirm the presence of Alfvenwaves in the interacting region of multiple CMEs/magnetic clouds. We concludethat Alfven waves and magnetic reconnection are the possible energyexchange/dissipation mechanisms during large-scale magnetic clouds collisions.The present study has significant implications not only in CME-magnetosphereinteractions but also in the interstellar medium where interactions oflarge-scale magnetic clouds are possible.

The first in-situ observation of torsional Alfven waves during the interaction of large-scale magnetic clouds