Journal ArticleDOI
Resonant acceleration and diffusion of outer zone electrons in an asymmetric geomagnetic field
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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.Abstract:
[1] The outer zone radiation belt consists of energetic electrons drifting in closed orbits encircling the Earth between ∼3 and 7 RE Electron fluxes in the outer belt show a strong correlation with solar and magnetospheric activity, generally increasing during geomagnetic storms with associated high solar wind speeds, and increasing in the presence of magnetospheric ULF waves in the Pc-5 frequency range In this paper, we examine the influence of Pc-5 ULF waves on energetic electrons drifting in an asymmetric, compressed dipole and find that such particles may be efficiently accelerated through a drift-resonant interaction with the waves We find that the efficiency of this acceleration increases with increasing magnetospheric distortion (such as may be attributed to increased solar wind pressure associated with high solar wind speeds) and with increasing ULF wave activity A preponderance of ULF power in the dawn and dusk flanks is shown to be consistent with the proposed acceleration mechanism Under a continuum of wave modes and frequencies, we find that the drift resonant acceleration process leads to additional modes of radial diffusion in the outer belts, with timescales that may be appropriate to those observed during geomagnetic stormsread more
Citations
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The Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on RBSP
Craig Kletzing,William S. Kurth,Mario H. Acuña,Robert J. MacDowall,Roy B. Torbert,T. F. Averkamp,D. Bodet,Scott R. Bounds,M. Chutter,John E. P. Connerney,D. Crawford,J. S. Dolan,R. T. Dvorsky,George Hospodarsky,J. Howard,Vania K. Jordanova,R. A. Johnson,D. L. Kirchner,B. T. Mokrzycki,G. Needell,J. Odom,D. Mark,R. F. Pfaff,J. R. Phillips,Chris Piker,S. L. Remington,Douglas E. Rowland,Ondrej Santolik,R. Schnurr,D. Sheppard,Charles W. Smith,Richard M. Thorne,J. Tyler +32 more
TL;DR: The Electric and Magnetic Field Instrument and Integrated Science (EMFISIS) investigation on the NASA Radiation Belt Storm Probes (now named the Van Allen Probes) mission provides key wave and very low frequency magnetic field measurements to understand radiation belt acceleration, loss, and transport.
Journal ArticleDOI
Corotating solar wind streams and recurrent geomagnetic activity: A review
Bruce T. Tsurutani,Bruce T. Tsurutani,Walter D. Gonzalez,Alicia L. Clúa de Gonzalez,Fernando L. Guarnieri,Nat Gopalswamy,Manuel Grande,Yohsuke Kamide,Yoshiya Kasahara,Gang Lu,Ian R. Mann,Robert L. McPherron,Finn Søraas,Vytenis M. Vasyliunas +13 more
TL;DR: In this paper, it was shown that geomagnetic storms associated with high-speed streams/CIRs will have the same initial, main, and recovery phases as those associated with ICME-related magnetic storms but that the interplanetary causes are considerably different.
Journal ArticleDOI
Review of radiation belt relativistic electron losses
Robyn Millan,Richard M. Thorne +1 more
TL;DR: In this article, a brief review of radiation belt electron losses is presented, which are vitally important for controlling the dynamics of the radiation belts and their relative importance to the overall rate of loss.
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
Timescales for radiation belt electron acceleration and loss due to resonant wave-particle interactions: 2. Evaluation for VLF chorus, ELF hiss, and electromagnetic ion cyclotron waves
TL;DR: In this paper, the authors used bounce-averaged quasi-linear diffusion coefficients for field-aligned waves with a Gaussian frequency spectrum in a dipole magnetic field to evaluate timescales for electron momentum diffusion and pitch angle diffusion, and confirmed that chorus diffusion is a viable mechanism for generating relativistic (MeV) electrons in the outer zone during the recovery phase of a storm or during periods of prolonged substorm activity when chorus amplitudes are enhanced.
References
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Journal ArticleDOI
Interplanetary Magnetic Field and the Auroral Zones
TL;DR: In this article, it was found that a model with a southward interplanetary magnetic field leads to a natural explanation of the SD currents and speculative aspects of the problem as they appear at this time are discussed.
Journal ArticleDOI
A universal instability of many-dimensional oscillator systems
TL;DR: In this article, the authors demonstrate the mechanism for a universal instability, the Arnold diffusion, which occurs in the oscillating systems having more than two degrees of freedom, which results in an irregular, or stochastic, motion of the system as if the latter were influenced by a random perturbation even though, in fact, the motion is governed by purely dynamical equations.
Journal ArticleDOI
Limit on stably trapped particle fluxes
Charles F. Kennel,H. E. Petschek +1 more
TL;DR: The limit on stably trapped particle fluxes determined theoretically and compared with data from Explorer satellites was first established in this paper, and the limit was later confirmed by the International Journal of Astronautics.
Journal ArticleDOI
Coordinates for Mapping the Distribution of Magnetically Trapped Particles
TL;DR: In this article, it is shown that a parameter L = f(B,I) can be defined which retains most of the desirable properties of I and has the additional property of organizing measurements along lines of force.
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