“…Thus, although dayside waves can occasionally (during geomagnetically active times) attain wave-normal angles near the resonance cone and scatter 1 E MeV electrons toward the loss cone (Agapitov et al, 2018;Artemyev et al, 2015Artemyev et al, , 2016, the predominant low-intensity and mildly oblique character of dayside chorus renders it, on average, ineffective in relativistic electron scattering. Thus, up to now relativistic electron loss is typically attributed to two other mechanisms: magnetopause shadowing (Gao et al, 2015;Sorathia et al, 2017;Turner et al, 2012) or cyclotron resonance with electromagnetic ion cyclotron waves (Blum et al, 2015;Grach & Demekhov, 2020;Ma et al, 2015;Mourenas et al, 2016;Shprits et al, 2016;Thorne & Kennel, 1971;Usanova et al, 2014;Zhang et al, 2021).…”