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Title: Acceleration of Oxygen Ions in Dipolarization Events: 1. CPS Distributions

Abstract

Abstract Using an MHD simulation of near tail reconnection associated with a flow burst and the collapse (dipolarization) of the inner tail in combination with test particle tracing we study the acceleration and flux increases of energetic oxygen ions (O + ). The characteristic orbits, distributions, and acceleration mechanisms are governed by the dimensionless parameter σ  =  ω ci t n , where ω ci is the ion gyro frequency and t n a characteristic Alfvén time of the MHD simulation. For σ  < 1, central plasma sheet (CPS) populations after the passage of the dipolarization front are found to resemble half‐shells in velocity space oriented toward dusk. They originate from within the CPS and are energized typically by a single encounter of the region of enhanced cross‐tail electric field associated with the flow burst. For larger σ values ( σ  > 1) the O + distributions resemble more closely those of protons, consisting of two counter‐streaming field‐aligned beams and an, albeit more tenuous and irregular, ring population perpendicular to the magnetic field. The existence of the beams, however, depends on suitable earthward moving source populations in the plasma sheet boundary layer or themore » adjacent lobes. The acceleration to higher energies is found to indicate a charge dependence, consistent with a dominance of more highly charged ions at energies of a few hundred keV. As in earlier simulations, the simulated fluxes show large anisotropies and nongyrotropic effects, phase bunching, and spatially and temporally localized beams.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [3]; ORCiD logo [4]
+ Show Author Affiliations
  1. Space Science Institute Boulder CO USA, Los Alamos National Laboratory Los Alamos NM USA
  2. Department of Physics and Technology University of Bergen Bergen Norway, NASA Ames Research Center Moffett Field CA USA
  3. Space Exploration Sector The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
  4. Space Research Institute Austrian Academy of Sciences Graz Austria
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1805315
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Name: Journal of Geophysical Research. Space Physics Journal Volume: 126 Journal Issue: 7; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

Citation Formats

Birn, J., Hesse, M., Bingham, S. T., Turner, D. L., and Nakamura, R. Acceleration of Oxygen Ions in Dipolarization Events: 1. CPS Distributions. United States: N. p., 2021. Web. doi:10.1029/2021JA029184.
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Birn, J., Hesse, M., Bingham, S. T., Turner, D. L., & Nakamura, R. Acceleration of Oxygen Ions in Dipolarization Events: 1. CPS Distributions. United States. https://doi.org/10.1029/2021JA029184
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Birn, J., Hesse, M., Bingham, S. T., Turner, D. L., and Nakamura, R. Tue . "Acceleration of Oxygen Ions in Dipolarization Events: 1. CPS Distributions". United States. https://doi.org/10.1029/2021JA029184.
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@article{osti_1805315,
title = {Acceleration of Oxygen Ions in Dipolarization Events: 1. CPS Distributions},
author = {Birn, J. and Hesse, M. and Bingham, S. T. and Turner, D. L. and Nakamura, R.},
abstractNote = {Abstract Using an MHD simulation of near tail reconnection associated with a flow burst and the collapse (dipolarization) of the inner tail in combination with test particle tracing we study the acceleration and flux increases of energetic oxygen ions (O + ). The characteristic orbits, distributions, and acceleration mechanisms are governed by the dimensionless parameter σ  =  ω ci t n , where ω ci is the ion gyro frequency and t n a characteristic Alfvén time of the MHD simulation. For σ  < 1, central plasma sheet (CPS) populations after the passage of the dipolarization front are found to resemble half‐shells in velocity space oriented toward dusk. They originate from within the CPS and are energized typically by a single encounter of the region of enhanced cross‐tail electric field associated with the flow burst. For larger σ values ( σ  > 1) the O + distributions resemble more closely those of protons, consisting of two counter‐streaming field‐aligned beams and an, albeit more tenuous and irregular, ring population perpendicular to the magnetic field. The existence of the beams, however, depends on suitable earthward moving source populations in the plasma sheet boundary layer or the adjacent lobes. The acceleration to higher energies is found to indicate a charge dependence, consistent with a dominance of more highly charged ions at energies of a few hundred keV. As in earlier simulations, the simulated fluxes show large anisotropies and nongyrotropic effects, phase bunching, and spatially and temporally localized beams.},
doi = {10.1029/2021JA029184},
journal = {Journal of Geophysical Research. Space Physics},
number = 7,
volume = 126,
place = {United States},
year = {Tue Jul 06 00:00:00 EDT 2021},
month = {Tue Jul 06 00:00:00 EDT 2021}
}
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https://doi.org/10.1029/2021JA029184
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