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In this Chapter we examine the role of the ngVLA to further our understandingof the different manifestations of convective or turbulence-driven stellaractivity on red giant and supergiant stars. The combination of high spatialresolution and high sensitivity will enable the ngVLA to significantly improveour understanding of the processes that dissipate energy in the extendedatmospheres of cool evolved stars, and drive ubiquitous stellar outflows. Thehigh spatial resolution will enable us to image the surfaces of nearby redsupergiants, and to measure the atmospheric extent of red giants.Multi-frequency observations will permit thermal continuum tomography on thelargest angular diameter stars, providing key empirical data to testtheoretical models. The complementary frequencies and similar spatialresolutions of the ngVLA and ALMA will be a powerful synergy.

Science with an ngVLA: Stellar Activity on Red Giant and Supergiant Stars: Mass Loss and the Evolution of the Stellar Dynamo