Comparative Study of Dayside Pulsating Auroras Induced by Ultralow-Frequency Waves

Pulsating auroras are usually observed with ultralow-frequency (ULF) waves in the Pc 3–5 band (period 10–600 s). These thought to result from interactions between energetic electrons and chorus waves, but their relationship ULF remains an open question. In this study, we investigated question by conducting a comparative study on two wave events pulsating near magnetic footprints. Conjugate observations Magnetospheric Multiscale mission Chinese Yellow River Station were used. both events, lower-band observed, which suggested be connected auroral pulsations wavelet analysis. The intensity of these oscillates at period physics laid behind them differs events. During event 22 January 2019, compressional changed threshold for whistler anisotropy instability periodically, affecting emission waves. 10 2016, poloidal modulated generation regulating electron temperature through drift resonance. may originate perturbations solar wind. We highlight role wind–magnetosphere–ionosphere coupling, requires further study.