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Title: The Evolution of the Plasma Sheet Ion Composition: Storms and Recoveries: Plasma Sheet Ion Composition

Abstract

The ion plasma sheet (~few hundred eV to ~few 10s keV) is usually dominated by H + ions. Here, changes in ion composition within the plasma sheet are explored both during individual events, and statistically during 54 calm-to-storm events and during 21 active-to-calm events. Ion composition data from the HOPE (Helium, Oxygen, Proton, Electron) instruments onboard Van Allen Probes satellites provide exceptional spatial and temporal resolution of the H +, O +, and He + ion fluxes in the plasma sheet. H+ shown to be the dominant ion in the plasma sheet in the calm-to-storm transition. However, the energy-flux of each ion changes in a quasi-linear manner during extended calm intervals. Heavy ions (O + and He +) become increasingly important during such periods as charge-exchange reactions result in faster loss for H + than for O + or He +. Results confirm previous investigations showing that the ion composition of the plasma sheet can be largely understood (and predicted) during calm intervals from knowledge of: (a) the composition of previously injected plasma at the onset of calm conditions, and (b) use of simple drift-physics models combined with calculations of charge-exchange losses.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. New Mexico Consortium, Los Alamos, NM (United States); Space Science Inst., Boulder, CO (United States). Center for Plasma Physics
  2. Planetary Science Inst., Tuscon, AZ (United States)
  3. New Mexico Consortium, Los Alamos, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  6. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1402646
Alternate Identifier(s):
OSTI ID: 1440493
Report Number(s):
LA-UR-17-26020; LA-UR-17-31432
Journal ID: ISSN 2169-9380; TRN: US1703018
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 12; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Heliospheric and Magnetospheric Physics

Citation Formats

Denton, M. H., Thomsen, M. F., Reeves, G. D., Larsen, B. A., Henderson, M. G., Jordanova, V. K., Fernandes, P. A., Friedel, R. H. W., Skoug, R. M., Funsten, H. O., MacDonald, E. A., and Spence, H. A. The Evolution of the Plasma Sheet Ion Composition: Storms and Recoveries: Plasma Sheet Ion Composition. United States: N. p., 2017. Web. doi:10.1002/2017JA024475.
Denton, M. H., Thomsen, M. F., Reeves, G. D., Larsen, B. A., Henderson, M. G., Jordanova, V. K., Fernandes, P. A., Friedel, R. H. W., Skoug, R. M., Funsten, H. O., MacDonald, E. A., & Spence, H. A. The Evolution of the Plasma Sheet Ion Composition: Storms and Recoveries: Plasma Sheet Ion Composition. United States. doi:10.1002/2017JA024475.
Denton, M. H., Thomsen, M. F., Reeves, G. D., Larsen, B. A., Henderson, M. G., Jordanova, V. K., Fernandes, P. A., Friedel, R. H. W., Skoug, R. M., Funsten, H. O., MacDonald, E. A., and Spence, H. A. Tue . "The Evolution of the Plasma Sheet Ion Composition: Storms and Recoveries: Plasma Sheet Ion Composition". United States. doi:10.1002/2017JA024475.
@article{osti_1402646,
title = {The Evolution of the Plasma Sheet Ion Composition: Storms and Recoveries: Plasma Sheet Ion Composition},
author = {Denton, M. H. and Thomsen, M. F. and Reeves, G. D. and Larsen, B. A. and Henderson, M. G. and Jordanova, V. K. and Fernandes, P. A. and Friedel, R. H. W. and Skoug, R. M. and Funsten, H. O. and MacDonald, E. A. and Spence, H. A.},
abstractNote = {The ion plasma sheet (~few hundred eV to ~few 10s keV) is usually dominated by H+ ions. Here, changes in ion composition within the plasma sheet are explored both during individual events, and statistically during 54 calm-to-storm events and during 21 active-to-calm events. Ion composition data from the HOPE (Helium, Oxygen, Proton, Electron) instruments onboard Van Allen Probes satellites provide exceptional spatial and temporal resolution of the H+, O+, and He+ ion fluxes in the plasma sheet. H+ shown to be the dominant ion in the plasma sheet in the calm-to-storm transition. However, the energy-flux of each ion changes in a quasi-linear manner during extended calm intervals. Heavy ions (O+ and He+) become increasingly important during such periods as charge-exchange reactions result in faster loss for H+ than for O+ or He+. Results confirm previous investigations showing that the ion composition of the plasma sheet can be largely understood (and predicted) during calm intervals from knowledge of: (a) the composition of previously injected plasma at the onset of calm conditions, and (b) use of simple drift-physics models combined with calculations of charge-exchange losses.},
doi = {10.1002/2017JA024475},
journal = {Journal of Geophysical Research. Space Physics},
number = 12,
volume = 122,
place = {United States},
year = {Tue Oct 03 00:00:00 EDT 2017},
month = {Tue Oct 03 00:00:00 EDT 2017}
}

Journal Article:
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