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Title: The evolution of ring current ion energy density and energy content during geomagnetic storms based on Van Allen Probes measurements

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1002/2015JA021533· OSTI ID:1402598
 [1];  [1];  [2];  [3];  [3]; ORCiD logo [4];  [4];  [4]; ORCiD logo [4]; ORCiD logo [4];  [5];  [6];  [7]; ORCiD logo [8]
  1. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics; Univ. of Colorado, Boulder, CO (United States). Dept. of Aerospace Engineering Sciences
  2. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  3. Aerospace Corporation, Los Angeles, CA (United States). Space Sciences Dept.
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  6. Johns Hopkins Univ., Laurel, MD (United States). Applied Physics Lab., Space Dept.
  7. New Jersey Inst. of Technology, Newark, NJ (United States). Center for Solar-Terrestrial Research
  8. Univ. of Colorado, Boulder, CO (United States). Cooperative Inst. for Research in Environmental Sciences; National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). National Centers for Environmental Information

Enabled by the comprehensive measurements from the Magnetic Electron Ion Spectrometer (MagEIS), Helium Oxygen Proton Electron mass spectrometer (HOPE), and Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) instruments onboard Van Allen Probes in the heart of the radiation belt, the relative contributions of ions with different energies and species to the ring current energy density and their dependence on the phases of geomagnetic storms are quantified. The results show that lower energy (<50 keV) protons enhance much more often and also decay much faster than higher-energy protons. During the storm main phase, ions with energies <50 keV contribute more significantly to the ring current than those with higher energies; while the higher-energy protons dominate during the recovery phase and quiet times. The enhancements of higher-energy proton fluxes as well as energy content generally occur later than those of lower energy protons, which could be due to the inward radial diffusion. For the 29 March 2013 storm we investigated in detail that the contribution from O+ is ~25% of the ring current energy content during the main phase and the majority of that comes from <50 keV O+. This indicates that even during moderate geomagnetic storms the ionosphere is still an important contributor to the ring current ions. Using the Dessler-Parker-Sckopke relation, the contributions of ring current particles to the magnetic field depression during this geomagnetic storm are also calculated. In conclusion, the results show that the measured ring current ions contribute about half of the Dst depression.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1402598
Report Number(s):
LA-UR-15-28234; TRN: US1703000
Journal Information:
Journal of Geophysical Research. Space Physics, Vol. 120, Issue 9; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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Cited By (10)

Space Weather Effects Produced by the Ring Current Particles journal October 2017
Modulation of Electromagnetic Ion Cyclotron Waves by Pc5 ULF Waves and Energetic Ring Current Ions journal March 2019
Ion Energies Dominating Energy Density in the Inner Magnetosphere: Spatial Distributions and Composition, Observed by Arase/MEP‐i journal November 2018
Variations of Field Line Eigenfrequencies With Ring Current Intensity journal November 2018
Multisatellite Analysis of Plasma Pressure in the Inner Magnetosphere During the 1 June 2013 Geomagnetic Storm journal February 2019
Statistical Study of Selective Oxygen Increase in High‐Energy Ring Current Ions During Magnetic Storms journal May 2019
Multi‐instrument Observations of Mesoscale Enhancement of Subauroral Polarization Stream Associated With an Injection journal March 2019
The Magnetosphere‐Ionosphere Electron Precipitation Dynamics and Their Geospace Consequences During the 17 March 2013 Storm journal August 2019
Meridional Distribution of Middle‐Energy Protons and Pressure‐Driven Currents in the Nightside Inner Magnetosphere: Arase Observations journal July 2019
Characteristics of storm time ion composition in the near-Earth plasma sheet using Geotail and RBSP measurements journal December 2018