Dayside Pc2 waves associated with flux transfer events in a 3D
hybrid-Vlasov simulation
Abstract
Flux transfer events (FTEs) are transient magnetic flux ropes at Earth’s
dayside magnetopause formed due to magnetic reconnection. As they move
across the magnetopause surface, they can generate disturbances in the
ultra-low frequency (ULF) range, which then propagate into the
magnetosphere. This study provides evidence of ULF waves in the Pc2 wave
frequency range caused by FTEs during dayside reconnection using a
global 3D hybrid-Vlasov simulation (Vlasiator). These waves resulted
from FTE formation and propagation at the magnetopause are particularly
associated with large, rapidly moving FTEs. The wave power is stronger
in the morning than afternoon, showing local time asymmetry. In the pre
and postnoon equatorial regions, significant poloidal and toroidal
components are present alongside the compressional component. The noon
sector, with fewer FTEs, has lower wave power and limited magnetospheric
propagation.