Abstract
The key dynamics of the magnetotail have been researched for decades and have
been associated with either three-dimensional (3-D) plasma instabilities
and/or magnetic reconnection. We apply a global hybrid-Vlasov code,
Vlasiator, to simulate reconnection self-consistently in the ion kinetic
scales in the noon–midnight meridional plane, including both dayside and
nightside reconnection regions within the same simulation box. Our simulation
represents a numerical experiment, which turns off the 3-D instabilities but
models ion-scale reconnection physically accurately in 2-D. We demonstrate
that many known tail dynamics are present in the simulation without a full
description of 3-D instabilities or without the detailed description of the
electrons. While multiple
reconnection sites can coexist in the plasma sheet, one reconnection point
can start a global reconfiguration process, in which magnetic field lines
become detached and a plasmoid is released. As the simulation run features
temporally steady solar wind input, this global reconfiguration is not
associated with sudden changes in the solar wind. Further, we show that lobe
density variations originating from dayside reconnection may play an
important role in stabilising tail reconnection.
Citation
ID:
174798
Ref Key:
palmroth2017annalestail