Connection of the magnetosheath jet with the foreshock activities

Plasma structures with an enhanced dynamic pressure, known as jets are often observed in the Earth’s magnetosheath. These structures are more often detected downstream of the quasi-parallel bow shock, i.e., behind the foreshock. This region is dominated by waves and reflected particles which interact with each other and create different transients. Xirogiannopoulou et al. (2024) found that the subsolar foreshock contains several types of structures with enhanced density or/and magnetic field magnitude - plasmoids, SLAMS and mixed structures. Many previous studies established that some of these foreshock structures can be a source of magnetosheath jets (Raptis et al., 2022). Following these results, we use data collected by the cross-calibrated THEMIS spacecraft and present multi-spacecraft case studies of the connection between the foreshock and magnetosheath structures. According to our observations, we suggest that the generation of magnetosheath jets is associated with some additional mechanism from the ones we know (ex. BS ripples) that is more complicated or the knowledge we have is incomplete.