Ion Acceleration in an HCS Reconnection Event
by Zhiyu Yin
March 29, 2024 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility;
Advisor: Professor James Drake and Dr. Marc Swisdak
In E14 the Parker Solar Probe(PSP) encountered a reconnection event in the
heliospheric current sheet (HCS) that revealed strong ion energization with
power law distributions of protons extending to 500keV. Because the
energetic particles were streaming sunward from an x-line that was
anti-sunward of PSP, the reconnection source of the energetic ions was
unambiguous. The physics of particle energization in this event has been
explored with the kglobal simulation model, which is now able to study
electron and ion power law formation during reconnection in macro-systems.
Using upstream parameters based on the data observed by PSP, we simulate
the dynamics of reconnection and analyze the resulting spectra of energetic
electrons and protons. The current layer forms multiple x-lines and
associated magnetic islands that undergo merger to drive particle
energization through the Fermi reflection. Power law distributions
extending nearly three decades in energy develop with proton energies
extending to 500keV, consistent with observations. Protons gain more energy
than electrons. We discuss the significance of these results for particle
energization in the HCS and more generally for reconnection driven energy
release throughout the heliosphere.
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