Abstract We present an event of chorus waves embedded within a magnetic hole (MH) in the Earth's magnetosheath, observed by the Magnetospheric Multi‐Scale (MMS) mission on 1 March 2016. Unlike conventional cases where chorus waves are typically detected near the center of a magnetic depression, in this event lower‐band chorus waves appear predominantly at the two edges of the ion‐scale MH. We examine the coupled dynamics of electrons under the simultaneous influence of the MH and the chorus waves. Our analysis shows that electrons are trapped within the MH cavity at critical pitch angles, while additional nonlinear trapping occurs along the field‐aligned direction due to interactions with the parallel wave electric field. The presence of enhanced parallel electron temperature anisotropy inside the MH further indicates electron heating associated with these processes. A detailed examination across multiple electron energy channels highlights the key role of wave‐particle interactions in shaping electron distributions within MHs. These results provide new insight into how chorus waves can operate in unconventional locations within magnetic structures, broadening our understanding of electron dynamics and heating in the turbulent magnetosheath.
Barik et al. (Sun,) studied this question.