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Van Allen Probes Bibliography is from August 2012 through September 2021
Found 10 entries in the Bibliography.
Showing entries from 1 through 10
TWINS Observations of the Dynamics of Ring Currents Ion Spectra on 17th March and 7th October 2015
Direct comparisons between RBSP (Van Allen Probes or Radiation Belt Storm Probes) and TWINS (Two Wide-angle Imaging Neutral-atom Spectrometers) for the main phase of two storms, 17th March and 7th October 2015, showed agreement between the in–situ ion measurements and the ion spectra from the deconvolved energetic neutral atom (ENA) measurements, except when O+ ions were significant. Spatial evolution of individual energy peaks in the ion spectra are studied using TWINS data. O+ ions are seen to result in intense peaks at ...
Shekhar, S.; Perez, J.; Ferradas, C.;
Published by: Journal of Geophysical Research: Space Physics Published on: 12/2020
YEAR: 2020   DOI: https://doi.org/10.1029/2020JA028156
Ring Currents; Magnetosphere; energy dependent drift; ion nose; Substorm Injections; Ion Spectra; Van Allen Probes
Simultaneously Formed Wedge-Like Structures of Different Ion Species Deep in the Inner Magnetosphere
In this study, ion data from the Helium, Oxygen, Proton, and Electron (HOPE) spectrometers onboard Van Allen Probes reveal the existence of wedge-like structures of O+, He+, and H+ ions deep in the inner magnetosphere. The behaviors of the wedge-like structures in terms of temporal evolution, spatial distribution, upper energy limit, as well as dependence on solar wind and different geomagnetic indices are investigated from both event studies of several consecutive orbits on 3 February 2013 and the subsequent statistical ana ...
Ren, Jie; Zong, Q.; Yue, C.; Zhou, X.; Fu, S; Spence, H.; Funsten, H.;
Published by: Journal of Geophysical Research: Space Physics Published on: 11/2020
YEAR: 2020   DOI: https://doi.org/10.1029/2020JA028192
wedge-like structures; Ring current ions; inner magnetosphere; Substorm Injections; Van Allen Probes
Rapid Enhancements of the Seed Populations in the Heart of the Earth\textquoterights Outer Radiation Belt: A Multicase Study
To better understand rapid enhancements of the seed populations (hundreds of keV electrons) in the heart of the Earth\textquoterights outer radiation belt (L* ~ 3.5\textendash5.0) during different geomagnetic activities, we investigate three enhancement events measured by Van Allen Probes in detail. Observations of the fluxes and the pitch angle distributions of energetic electrons are analyzed to determine rapid enhancements of the seed populations. Our study shows that three specified processes associated with substorm ele ...
Tang, C.; Xie, X.; Ni, B.; Su, Z.; Reeves, G.; Zhang, J.-C.; Baker, D.; Spence, H.; Funsten, H.; Blake, J.; Wygant, J.; Dai, G;
Published by: Journal of Geophysical Research: Space Physics Published on: 06/2018
YEAR: 2018   DOI: 10.1029/2017JA025142
enhanced convection; Substorm Injections; the outer radiation belt; the seed population; ULF waves; Van Allen Probes
Radiation belt seed population and its association with the relativistic electron dynamics: A statistical study
Using the particle data measured by Van Allen Probe A from October 2012 to March 2016, we investigate in detail the radiation belt seed population and its association with the relativistic electron dynamics during 74 geomagnetic storms. The period of the storm recovery phase was limited to 72 h. The statistical study shows that geomagnetic storms and substorms play important roles in the radiation belt seed population (336 keV electrons) dynamics. Based on the flux changes of 1 MeV electrons before and after the storm peak, ...
Tang, C.; Wang, Y.; Ni, B.; Zhang, J.-C.; Reeves, G.; Su, Z.; Baker, D.; Spence, H.; Funsten, H.; Blake, J.;
Published by: Journal of Geophysical Research: Space Physics Published on: 05/2017
YEAR: 2017   DOI: 10.1002/2017JA023905
relativistic electrons; Substorm Injections; the outer radiation belt; the seed population; Van Allen Probes
The role of ring current particle injections: Global simulations and Van Allen Probes observations during 17 March 2013 storm
We simulate substorm injections observed by the Van Allen Probes during the 17 March 2013 storm using a self-consistent coupling between the ring current model RAM-SCB and the global MHD model BATS-R-US. This is a significant advancement compared to previous studies that used artificially imposed electromagnetic field pulses to mimic substorm dipolarization and associated inductive electric field. Several substorm dipolarizations and injections are reproduced in the MHD model, in agreement with the timing of shape changes in ...
Yu, Yiqun; Jordanova, Vania; Welling, Dan; Larsen, Brian; Claudepierre, Seth; Kletzing, Craig;
Published by: Geophysical Research Letters Published on: 02/2014
YEAR: 2014   DOI: 10.1002/2014GL059322
ring current dynamics; self-consistent treatment of fields and plasma; Substorm Injections; Van Allen Probes
Chorus wave generation near the dawnside magnetopause due to drift shell splitting of substorm-injected electrons
We study the relationship between the electron injection and the chorus waves during a substorm event on 23 March 2007. The chorus waves were detected at high geomagnetic latitude (\~70\textdegreeS) Antarctic observatories in the range of 0600\textendash0900 h in magnetic local time (MLT). Electrons drifting from the injection event were measured by two LANL spacecraft at 0300 and 0900 MLT. The mapping of auroral brightening areas to the magnetic equator shows that the injection occurred in an MLT range of 2200\textendash240 ...
Min, Kyungguk; Lee, Jeongwoo; Keika, Kunihiro;
Published by: American Geophysical Union Published on: 10/2010
YEAR: 2010   DOI: 10.1029/2010JA015474
chorus and substorm; electron drift; RBSP; Substorm Injections; Van Allen Probes
Substorm injections produce sufficient electron energization to account for MeV flux enhancements following some storms
One of the main questions concerning radiation belt research is the origin of very high energy (>1 MeV) electrons following many space storms. Under the hypothesis that the plasma sheet electron population is the source of these electrons, which are convected to the outer radiation belt region during substorms, we estimate the flux of particles generated at geosynchronous orbit. We use the test particle method of following guiding center electrons as they drift in the electromagnetic fields during substorm dipolarization. Th ...
Published by: Journal of Geophysical Research Published on: 07/2005
YEAR: 2005   DOI: 10.1029/2004JA010511
Substorm injection of relativistic electrons to geosynchronous orbit during the great magnetic storm of March 24, 1991
The great March 1991 magnetic storm and the immediately preceding solar energetic particle event (SEP) were among the largest observed during the past solar cycle, and have been the object of intense study. We investigate here, using data from eight satellites, the very large delayed buildup of relativistic electron flux in the outer zone during a 1.5-day period beginning 2 days after onset of the main phase of this storm. A notable feature of the March storm is the intense substorm activity throughout the period of the rela ...
Ingraham, J.; Cayton, T.; Belian, R.; Christensen, R.; Friedel, R.; Meier, M.; Reeves, G.; Takahashi, K;
Published by: Journal of Geophysical Research Published on: 11/2001
YEAR: 2001   DOI: 10.1029/2000JA000458
The temporal evolution of electron distributions and associated wave activity following substorm injections in the inner magnetosphere
The temporal evolution of electron distributions and associated wave activity following substorm injections in the inner magnetosphere are investigated using data from the CRRES satellite. Equatorial electron distributions and concomitant wave spectra outside the plasmapause on the nightside of the Earth are studied as a function of time since injection determined from the auroral-electrojet index (AE). The electron cyclotron harmonic (ECH) wave amplitudes are shown to be very sensitive to small modeling errors in the locati ...
Meredith, Nigel; Horne, Richard; Johnstone, Alan; Anderson, Roger;
Published by: Journal of Geophysical Research Published on: 06/2000
YEAR: 2000   DOI: 10.1029/2000JA900010
Substorm electron injections: Geosynchronous observations and test particle simulations
We investigate electron acceleration and the flux increases associated with energetic electron injections on the basis of geosynchronous observations and test-electron orbits in the dynamic fields of a three-dimensional MHD simulation of neutral line formation and dipolarization in the magnetotail. This complements an earlier investigation of test protons [Birn et al., 1997b]. In the present paper we consider equatorial orbits only, using the gyrocenter drift approximation. It turns out that this approximation is valid for e ...
Birn, J.; Thomsen, M.; Borovsky, J.; Reeves, G.; McComas, D.; Belian, R.; Hesse, M.;
Published by: Journal of Geophysical Research Published on: 05/1998
YEAR: 1998   DOI: 10.1029/97JA02635