2024/07/27 by Shinpei Shibata, Shibata, Shinpei, Shota Kisaka +1
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Acceleration #Astronomy #Astrophysics #Classical mechanics #FOS: Physical sciences #Geometry #Geophysics #Geophysics and Gravity Measurements #High Energy Astrophysical Phenomena (astro-ph.HE) #Magnetosphere #Mathematics #Nuclear physics #Particle acceleration #Physics #Plasma #Point (geometry) #Pulsar #Pulsars and Gravitational Waves Research #Solar and Space Plasma Dynamics
paper · pdf · doi:10.48550/arxiv.2407.19138
openalex publication_date 2024/07/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the centrifugal acceleration in an axisymmetric pulsar magnetosphere under the ideal-MHD approximation. We solved the field-aligned equations of motion for flows inside the current sheet with finite thickness. We find that flows coming into the vicinity of a Y-point become super fast. The centrifugal acceleration takes place efficiently, and most of the Poynting energy is converted into kinetic energy. However, the super fast flow does not provide enough centrifugal drift current to open the magnetic field. Opening of the magnetic field is possible by the plasmas that are accelerated in the azimuthal direction with a large Lorentz factor in the closed field region. We find that this acceleration takes place if the field strength increases toward the Y-point from inside. The accelerated plasma is transferred from the closed field region to the open field region by magnetic reconnection with plasmoid emission. We also estimate the Lorentz factor to be reached in the centrifugal wind.