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The first estimation of the incompressible energy cascade rate atmagnetohydrodynamic (MHD) scales is obtained in the plasma upstream of theMartian bow shock, using MAVEN observations and an exact relation derived forMHD turbulence. The energy cascade rate is computed for events with and withoutproton cyclotron wave (PCW) activity, for time intervals when MAVEN was in thesolar wind with no magnetic connection to the bow shock. It is shown that thenonlinear cascade of energy at the MHD scales is slightly amplified when PCWsare present in the plasma. The analysis of the normalized cross helicity andresidual energy for the turbulent fluctuations shows the presence of Alfv\'enicand non-Alfv\'enic fluctuations in a magnetic dominant regime for the majorityof the cases.

Solar Wind Turbulence Around Mars: Relation Between The Energy Cascade Rate And The Proton Cyclotron Waves Activity