Magnetotail‐Inner Magnetosphere Transport Associated With Fast Flows Based on Combined Global‐Hybrid and CIMI Simulation

Abstract

Using the combined Auburn global hybrid simulation code in 3-D (ANGIE3D) and the Comprehensive Inner Magnetosphere-Ionosphere (CIMI) model, we investigate the self-consistent connection of fast flow injections from the tail plasma sheet and the inner magnetosphere under a southward IMF. In the dynamic run, the hybrid results provide the CIMI model with 3-D magnetic field and the electric potential at the high latitude ionosphere boundary as well as the full ion phase space distribution function at the CIMI outer boundary at the equator. The simulation shows that magnetotail reconnection, which has a dawn-dusk size of ∼1-5 R E , recurs with a period of several minutes, resulting in recurring localized fast flow injections. Strong ion temperature anisotropy and non-Maxwellian distributions are present in the fast flows, and the braking of fast flows due to the dipole-like field results in further perpendicular heating in the injection sources. Multiple fast flow injections lead to multiple peaks in the particle fluxes in the inner magnetosphere as well as layers of upward and downward fieldaligned currents at the ionosphere, and low energy particles penetrate deeper radially than the high energy particles. The combined ANGIE3D-CIMI model can be used to calculate the global kinetic physics that contains both Region-1 and Region-2 field-aligned currents. LIN ET AL.

The Role of Mesoscale Plasma Sheet Dynamics in Ring Current Formation

“…Ukhorskiy et al (2018) used global MHD and test particle modeling to investigate particle interactions with a single bubble to demonstrate the importance of the mesoscale structure of the bubbles to trap the particles, whereas Cramer et al (2017) performed a more expansive study over a range of stormtime events to demonstrate the importance of bubbles in transport. In a series of papers representing the most self-consistent work to date (Lin et al, 2017(Lin et al, , 2021Cheng et al, 2020), global hybrid simulations were used to demonstrate that reconnection creates depleted bubbles that are anisotropic, non-Maxwellian, and not in equilibrium. However, spatial rescaling is necessary for global hybrid simulations to be computationally tractable and even then the duration of these simulations remains limited.…”

Magnetotail Ion Acceleration in 3‐D Global Hybrid Simulations

“…The DF is found to result in a reflected ion beam in the velocity distribution in the near‐tail region, as shown by Lin et al. (2021). Artemyev et al.…”

“…Contribution of DF to ion acceleration has also been found in our simulation, although the DF does not appear to provide a major energy enhancement. The DF is found to result in a reflected ion beam in the velocity distribution in the near-tail region, as shown by Lin et al (2021). Artemyev et al (2012) suggested that when ion gyroradii become comparable with the scales of the magnetic field, ions can gain energy through the resonance acceleration.…”

“…We focus on the acceleration processes of ions that originate around the near‐Earth reconnection site of y ∼ [−10.,−8]R E (see Figure 1, and L. Cheng et al., 2020; Lin et al., 2021), which is on the dawn side, during their earthward orbits from the tail into the inner magnetosphere. This reconnection region of interest is located at x ∼ −16R E at t = 2362 s, as described above.…”

Effect of IMF By on the Entry of Solar Wind Ions Into the Near‐Earth Tail Lobe: Global Hybrid Simulation and MMS Observation

“…Therefore, here we present the results from a global 3D hybrid simulation using the AuburN Global hybrid CodE in 3D (ANGIE3D) hybrid code (Lin et al., 2014). The ANGIE3D code has been used in simulations of the solar wind‐magnetosphere coupling and global dynamics in the magnetosphere, including the magnetotail, magnetopause, and plasma sheet (Lin et al., 2014, 2017, 2021, 2022; Lu et al., 2016; Lu, Lin, et al., 2015; Lu, Lu, et al., 2015; Wang et al., 2020, 2021).…”