The Response of Auroral-Oval Waves to CIR-Driven Recurrent Storms: FY-3E/ACMag Observations

Alfven-branch waves provide an efficient means for transporting energy into the auroral oval. Here, we report observations of these obtained by Fengyun-3E (FY-3E)/ACMag instruments, which are designed to detect three-dimensional AC magnetic fields in 0.05–25 Hz band. The suggest that broadband a permanent feature oval, although their amplitude and locations vary with global state magnetosphere. We primarily focus on data from 10 July 2021 26 August 2021, during series recurrent storms driven solar wind corotating interaction regions (CIRs) occurred. Analysis shows auroral-oval grow (1–3 orders magnitude) shift lower latitude (∼10°) immediately following decrease SYM-H index each storm. Further investigation reveals response has time scale equal or less than FY-3E’s effective revisiting time, is about 45 min. presented this paper confirm FY-3E/ACMag instruments high-resolution monitor could further our understanding physics.