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Title: Fully Kinetic Simulations of Proton-beam-driven Instabilities from Parker Solar Probe Observations

Journal Article · · The Astrophysical Journal
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]
  1. Royal Observatory of Belgium, Brussels (Belgium); Katholieke Univ. Leuven, Heverlee (Belgium)
  2. Royal Observatory of Belgium, Brussels (Belgium); Moscow State Univ., Moscow (Russian Federation)
  3. Katholieke Univ. Leuven, Heverlee (Belgium); Royal Belgian Institute for Space Aeronomy (BIRA - IASB), Brussels (Belgium)
  4. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  5. Chilean Nuclear Energy Commission, Santiago (Chile). Research Center in the Intersection of Plasma Physics, Matter, and Complexity (P2mc); Univ. Andres Bello, Santiago (Chile)
  6. Ruhr Univ., Bochum (Germany)
  7. Katholieke Univ. Leuven, Heverlee (Belgium)

The expanding solar wind plasma ubiquitously exhibits anisotropic nonthermal particle velocity distributions. Typically, proton velocity distribution functions (VDFs) show the presence of a core and a field-aligned beam. Novel observations made by the Parker Solar Probe (PSP) in the innermost heliosphere have revealed new complex features in the proton VDFs, namely anisotropic beams that sometimes experience perpendicular diffusion. In this study, we use a 2.5D fully kinetic simulation to investigate the stability of proton VDFs with anisotropic beams observed by PSP. Our setup consists of a core and an anisotropic beam population that drift with respect to each other. This configuration triggers a proton beam instability from which nearly parallel fast magnetosonic modes develop. Our results demonstrate that before this instability reaches saturation, the waves resonantly interact with the beam protons, causing perpendicular heating at the expense of the parallel temperature.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; European Space Agency (ESA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2475583
Report Number(s):
LA-UR--24-24599
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 975; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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