Seven‐Dimensional Wave‐Particle Interaction Spectral Analyzer (WISA‐7D): A Powerful Tool for Analyzing Wave‐Particle Interaction in Plasmas

Abstract Wave‐particle interactions are central to energy conversion and anomalous transport in collisionless plasmas, yet their quantification remains challenging. We present the Seven‐Dimensional Wave‐particle Interaction Spectral Analyzer (WISA‐7D), a framework that directly quantifies secular energy conversion and anomalous effects across frequency space, 3D wavevector space, and 3D velocity phase space. To demonstrate its capability, we apply WISA‐7D to a kinetic Alfvén wave (KAW) packet observed by Magnetospheric Multiscale mission. The results reveal distinct ion and electron energy exchange patterns with this KAW and quantify associated anomalous electric fields and flows. WISA‐7D provides a powerful diagnostic for advancing our understanding of wave‐particle interactions and for validating and refining theoretical models.