Authors: Riddhi Bandyopadhyay (University of Delaware), Sujan Gautam (University of Delaware), William Matthaeus (University of Delaware)

The dissipation of turbulent fluctuations in the collisionless solar wind remains a fundamental problem in heliophysics. In this study, we investigate ion cyclotron resonance as a potential dissipation mechanism in sub-Alfvénic solar wind streams observed by the Parker Solar Probe. Our results indicate that ion cyclotron dissipation can contribute significantly to the conversion of turbulent energy into proton thermal energy in near-Sun solar wind, highlighting its role in regulating plasma heating and the evolution of turbulence in the inner heliosphere.