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The Interplay Between Collisionless Magnetic Reconnection and Turbulence.
Space Sci Rev
November 2024
University of Texas at Arlington, Arlington, TX USA.
Article Synopsis
- Turbulence and magnetic reconnection are important nonlinear plasma phenomena that significantly affect energy transport in space and astrophysical plasmas.
- Recent high-resolution, multi-spacecraft observations have improved our understanding of their complex interactions, revealing how turbulence generates current sheets that can undergo reconnection.
- This paper reviews current knowledge on these interactions in collisionless plasmas, particularly in Earth's magnetosphere, highlighting findings from NASA's missions in key areas like the magnetosheath and magnetotail.
Regimes of ion dynamics in current sheets: The machine learning approach.
Phys Rev E
December 2022
Space Research Institute RAS, Moscow 117997, Russia.
Current sheets are spatially localized almost-one-dimensional (1D) structures with intense plasma currents. They play a key role in storing the magnetic field energy and they separate different plasma populations in planetary magnetospheres, the solar wind, and the solar corona. Current sheets are primary regions for the magnetic field line reconnection responsible for plasma heating and charged particle acceleration.
View Article and Find Full Text PDFInside the magnetosheath, the IBEX-Hi energetic neutral atom (ENA) imager measures a distinct background count rate that is more than 10 times the typical heliospheric ENA emissions observed when IBEX is outside the magnetosheath. The source of this enhancement is magnetosheath ions of solar wind (SW) origin that deflect around the Earth's magnetopause (MP), scatter and neutralize from the anti-sunward part of the IBEX-Hi sunshade, and continue into the instrument as neutral atoms, behaving indistinguishably from ENAs emitted from distant plasma sources. While this background pollutes observations of outer heliospheric ENAs, it provides a clear signature of IBEX crossings over the magnetospheric boundaries.
View Article and Find Full Text PDFUnderstanding the energization processes and constituent composition of the plasma and energetic particles injected into the near-Earth region from the tail is an important component of understanding magnetospheric dynamics. In this study, we present multiple case studies of the high-energy (≳40 keV) suprathermal ion populations during energetic particle enhancement events observed by the Energetic Ion Spectrometer (EIS) on NASA's Magnetospheric Multiscale (MMS) mission in the magnetotail. We present results from correlation analysis of the flux response between different energy channels of different ion species (hydrogen, helium, and oxygen) for multiple cases.
View Article and Find Full Text PDFBallooning-Interchange Instability in the Near-Earth Plasma Sheet and Auroral Beads: Global Magnetospheric Modeling at the Limit of the MHD Approximation.
Geophys Res Lett
July 2020
High Altitude Observatory, National Center for Atmospheric Research Boulder CO USA.
Explosive magnetotail activity has long been understood in the context of its auroral manifestations. While global models have been used to interpret and understand many magnetospheric processes, the temporal and spatial scales of some auroral forms have been inaccessible to global modeling creating a gulf between observational and theoretical studies of these phenomena. We present here an important step toward bridging this gulf using a newly developed global magnetosphere-ionosphere model with resolution capturing 30 km azimuthal scales in the auroral zone.
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