“…Although they are often discussed as traveling parallel to the magnetic field, oblique whistler waves were also detected (Cattell et al., 2008) and prompted further studies (Artemyev et al., 2016; Ma et al., 2017; Yoon et al., 2014). Furthermore, whilst they were originally discovered in Earth's magnetosphere, spacecraft observations showed that whistler waves also occur in solar wind (Narita et al., 2016) and the atmospheres of Venus (Pérez‐Invernón et al., 2017) and Jupiter (Imai et al., 2018). This study will focus on whistling behavior in Earth's magnetosphere at parallel, oblique, and perpendicular propagation, and how it is affected by the occurrence of avoided crossings compared to parallel propagation (De Jonghe & Keppens, 2020).…”