Simulation of dispersionless injections and drift echoes of energetic electrons associated with substorms
TLDR
In this article, the authors show that dispersionless injections can be understood as a consequence of changes in the electric and magnetic fields by modeling an electron injection event observed early on January 10, 1997 by means of a test-particle simulation.Abstract:
The term “dispersionless injection” refers to a class of events which show simultaneous enhancement (injection) of electrons and ions with different energies usually seen at or near geosynchronous orbit. We show that dispersionless injections can be understood as a consequence of changes in the electric and magnetic fields by modeling an electron injection event observed early on January 10, 1997 by means of a test-particle simulation. The model background magnetic field is a basic dipole field made asymmetrical by a compressed dayside and a weakened nightside. The transient fields are modeled with only one component of the electric field which is westward and a consistent magnetic field. These fields are used to model the major features of a dipolarization process during a substorm onset. We follow the electrons using a relativistic guiding center code. Our simulation results, with an initial kappa electron energy flux spectrum, reproduce the observed electron injection and subsequent drift echoes and show that the energization of injected electrons is mainly due to betatron acceleration of the preexisting electron population at larger radial distances in the magnetotail by transient fields.read more
Citations
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The Electric Field and Waves Instruments on the Radiation Belt Storm Probes Mission
John R. Wygant,John W. Bonnell,Keith Goetz,Robert E. Ergun,F. S. Mozer,Stuart D. Bale,Michael Ludlam,Paul Turin,Peter Harvey,R. Hochmann,K. Harps,Greg Dalton,J. McCauley,W. Rachelson,D. Gordon,B. Donakowski,C. Shultz,Christopher D. Smith,M. Diaz-Aguado,J. Fischer,S. Heavner,Peter Berg,D. M. Malsapina,M. Bolton,Mary K. Hudson,Robert J. Strangeway,Daniel N. Baker,Xinlin Li,Jay M. Albert,John C. Foster,C. C. Chaston,Ian R. Mann,Eric Donovan,Christopher Cully,Cynthia A Cattell,Vladimir Krasnoselskikh,Kris Kersten,A. Brenneman,J. B. Tao +38 more
TL;DR: In this paper, the Van Allen Probes were used to measure three dimensional quasi-static and low frequency electric fields and waves associated with the acceleration of energetic charged particles in the inner magnetosphere of the Earth.
Journal ArticleDOI
Relativistic electron dynamics in the inner magnetosphere — a review
TL;DR: A review and comparison of the current state of research into relativistic electron dynamics, covering simple diffusion, substorm acceleration, ULF wave acceleration, recirculation by ULF waves or plasmaspheric hiss is given in this paper.
Journal ArticleDOI
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
Daniel N. Baker,Shrikanth Kanekal,V. Hoxie,Susan N. Batiste,M. Bolton,Xinlin Li,Scot R. Elkington,S. Monk,R. Reukauf,S. Steg,J. Westfall,C. Belting,B. Bolton,D. Braun,B. Cervelli,K. Hubbell,M. Kien,S. Knappmiller,S. Wade,Bret Lamprecht,K. Stevens,J. Wallace,A. Yehle,Harlan E. Spence,R. H. W. Friedel +24 more
TL;DR: The Relativistic Electron-Proton Telescope (REPT) as mentioned in this paper was designed for the Radiation Belt Storm Probe (RBSP) pair of spacecraft to measure high-energy electrons (up to ∼20 MeV) with excellent sensitivity and also measured magnetospheric and solar protons to energies well above E=100 MeV.
Journal ArticleDOI
Resonant acceleration and diffusion of outer zone electrons in an asymmetric geomagnetic field
TL;DR: In this paper, the influence of Pc-5 ULF waves on energetic electrons drifting in an asymmetric, compressed dipole and finding that such particles may be efficiently accelerated through a drift-resonant interaction with the waves was examined.
Journal ArticleDOI
A THEMIS multicase study of dipolarization fronts in the magnetotail plasma sheet
Andrei Runov,Vassilis Angelopoulos,Xu-Zhi Zhou,Xiao-Jia Zhang,S. Li,Ferdinand Plaschke,John W. Bonnell +6 more
TL;DR: In this paper, a superposed epoch analysis of dipolarization front crossings and their characteristic gradient scales was performed, revealing a rapid 50% decrease in plasma density and ion pressure, a factor of 2-3 increase in high-energy (30-200 keV) electron flux and electron temperature, and transient enhancements of ∼5 mV/m in duskward and earthward electric field components.
References
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