@CASSCFenjoyer they certainly do! Even our sun does - it's the driver of the solar cycle and solar spots.You can find more info here https://www.esa.int/Science_Exploration/Space_Science/The_solar_cycle_a_heartbeat_of_stellar_energyAnd here is a really cool recent measurement https://www.esa.int/ESA_Multimedia/Keywords/Description/Sun_magnetic_field/(result_type)/images
