DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015

Journal Article · · Journal of Geophysical Research. Space Physics

Ionospheric heavy ions play an important role in the dynamics of Earth's magnetosphere. The greater mass and gyro radius of ionospheric oxygen differentiates its behavior from protons at the same energies. Oxygen may have an impact on tail reconnection processes, and it can at least temporarily dominate the energy content of the ring current during geomagnetic storms. At sub-keV energies, multi-species ion populations in the inner magnetosphere form the warm plasma cloak, occupying the energy range between the plasmasphere and the ring current. Lastly, cold lighter ions from the mid-latitude ionosphere create the co-rotating plasmasphere whose outer regions can interact with the plasma cloak, plasma sheet, ring current, and outer electron belt. Here in this paper we present a statistical view of warm, cloak-like ion populations in the inner magnetosphere, contrasting in particular the warm plasma composition during quiet and active times. We study the relative abundances and absolute densities of warm plasma measured by the Van Allen Probes, whose two spacecraft cover the inner magnetosphere from plasmaspheric altitudes close to Earth to just inside geostationary orbit. We observe that warm (>30 eV) oxygen is most abundant closer to the plasmasphere boundary whereas warm hydrogen dominates closer to geostationary orbit. Warm helium is usually a minor constituent, but shows a noticeable enhancement in the near-Earth dusk sector.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396; NAS5-01072
OSTI ID:
1394981
Report Number(s):
LA-UR-17-24831
Journal Information:
Journal of Geophysical Research. Space Physics, Vol. 122, Issue 11; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

References (50)

State studies of Earth's plasmasphere: A review journal July 2011
Thermal ion composition measurements of the formation of the new outer plasmasphere and double plasmapause during storm recovery phase journal August 1984
Ring current dynamics in moderate and strong storms: Comparative analysis of TWINS and IMAGE/HENA data with the Comprehensive Ring Current Model: STRONG STORM VERSUS MODERATE STORM journal December 2010
Circulation of Heavy Ions and Their Dynamical Effects in the Magnetosphere: Recent Observations and Models journal October 2014
Mission Overview for the Radiation Belt Storm Probes Mission journal January 2013
Spacecraft surface charging within geosynchronous orbit observed by the Van Allen Probes journal February 2016
Wedge-like dispersion of sub-keV ions in the dayside magnetosphere: Particle simulation and Viking observation journal December 2001
The Magnetic Electron Ion Spectrometer (MagEIS) Instruments Aboard the Radiation Belt Storm Probes (RBSP) Spacecraft journal June 2013
Review of Solar Wind Entry into and Transport Within the Plasma Sheet journal November 2014
Geomagnetic activity dependence of O+ in transit from the ionosphere journal November 2009
Modeling ionospheric outflows and their impact on the magnetosphere, initial results: MODELING IONOSPHERIC OUTFLOWS AND IMPACT journal May 2009
Oxygen torus in the deep inner magnetosphere and its contribution to recurrent process of O + -rich ring current formation : OXYGEN TORUS IN INNER MAGNETOSPHERE journal October 2011
Distribution of density along magnetospheric field lines journal January 2006
Observations of the warm plasma cloak and an explanation of its formation in the magnetosphere: WARM PLASMA CLOAK journal September 2008
Multiple discrete-energy ion features in the inner magnetosphere: 9 February 1998, event journal January 2004
Three-Species Collisionless Reconnection: Effect of O + on Magnetotail Reconnection journal October 2004
Kp forecast models: Kp FORECAST MODELS journal April 2005
Analysis of GEO spacecraft anomalies: Space weather relationships: SPACE WEATHER EFFECTS ON GEO SPACECRAFT ANOMALIES journal June 2011
Initial observations of thermal plasma composition and energetics from Dynamics Explorer-1 journal September 1982
The Relativistic Proton Spectrometer (RPS) for the Radiation Belt Storm Probes Mission journal August 2012
CRRES Low-Energy Magnetospheric Ion Composition Sensor journal July 1992
Science Objectives and Rationale for the Radiation Belt Storm Probes Mission journal September 2012
Empirical models of the low-energy plasma in the inner magnetosphere: EMPIRICAL PLASMA MODELS journal December 2005
Source location of the wedge-like dispersed ring current in the morning sector during a substorm journal January 2006
Combined Release and Radiation Effects Satellite (CRRES): Spacecraft and Mission journal July 1992
The Earth: Plasma Sources, Losses, and Transport Processes journal September 2015
Heavy ion mass loading of the geomagnetic field near the plasmapause and ULF wave implications: HEAVY ION MASS LOADING journal February 2005
The Relativistic Electron-Proton Telescope (REPT) Instrument on Board the Radiation Belt Storm Probes (RBSP) Spacecraft: Characterization of Earth’s Radiation Belt High-Energy Particle Populations journal December 2012
Composition signatures in ion injections and its dependence on geomagnetic conditions journal January 2002
The terrestrial ring current: Origin, formation, and decay journal November 1999
Statistical distribution of the storm-time proton ring current: POLAR measurements: STORM-TIME PROTON RING CURRENT journal October 2002
Solar cycle variation of geosynchronous plasma mass density derived from the frequency of standing Alfvén waves: MASS DENSITY AT GEOSYNCHRONOUS ORBIT journal July 2010
The Electric Field and Waves Instruments on the Radiation Belt Storm Probes Mission journal October 2013
Empirical model of proton fluxes in the equatorial inner magnetosphere: Development journal November 2001
The fine-scale structure of the outer plasmasphere journal January 1995
Transport of thermal-energy ionospheric oxygen (O + ) ions between the ionosphere and the plasma sheet and ring current at quiet times preceding magnetic storms : IN-TRANSIT IONOSPHERIC OXYGEN IONS journal July 2012
Helium, Oxygen, Proton, and Electron (HOPE) Mass Spectrometer for the Radiation Belt Storm Probes Mission journal March 2013
Plasmapause location under quiet geomagnetic conditions ( K p ≤ 1): THEMIS observations journal September 2015
Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) journal April 2013
Plasma sheet access to geosynchronous orbit: Generalization to numerical global field models journal December 2001
Multiple discrete-energy ion features in the inner magnetosphere: Observations and simulations journal May 2000
Statistical properties of the surface-charging environment at geosynchronous orbit: SURFACE CHARGING AT GEOSYNCHRONOUS ORBIT journal May 2013
Formation of intense nose structures journal February 2001
Background subtraction for the Cluster/CODIF plasma ion mass spectrometer journal January 2014
Particle Diffusion in the Radiation Belts book January 1974
Timescale for the formation of the cold-dense plasma sheet: A case study journal January 2006
Theories and Observations of Ion Energization and Outflow in the High Latitude Magnetosphere journal April 1997
Delivery of cold, dense plasma sheet material into the near-Earth region journal January 2003
Fast acceleration of inner magnetospheric hydrogen and oxygen ions by shock induced ULF waves: FAST ACCELERATION OF HYDROGEN AND OXYGEN IONS journal November 2012
Science Goals and Overview of the Radiation Belt Storm Probes (RBSP) Energetic Particle, Composition, and Thermal Plasma (ECT) Suite on NASA’s Van Allen Probes Mission journal October 2013

Cited By (1)

Heavy ion acceleration by EMIC waves in the near-Earth plasma sheet journal February 2019