  The Kelvin-Helmholtz instability (KHI) is a known mechanism for penetration
of solar wind matter into the magnetosphere. Using three-dimensional, resistive
magnetohydrodynamic simulations, the double mid-latitude reconnection (DMLR)
process was shown to efficiently exchange solar wind matter into the
magnetosphere, through mixing and reconnection. Here, we compute test particle
orbits through DMLR configurations. In the instantaneous electromagnetic
fields, charged particle trajectories are integrated using the guiding centre
approximation. The mechanisms involved in the electron particle orbits and
their kinetic energy evolutions are studied in detail, to identify specific
signatures of the DMLR through particle characteristics. The charged particle
orbits are influenced mainly by magnetic curvature drifts. We identify complex,
temporarily trapped, trajectories where the combined electric field and
(reconnected) magnetic field variations realize local cavities where particles
gain energy before escaping. By comparing the orbits in strongly deformed
fields due to the KHI development, with the textbook mirror-drift orbits
resulting from our initial configuration, we identify effects due to current
sheets formed in the DMLR process. We do this in various representative stages
during the DMLR development.
