scholarly journals Laboratory Observations of Wave-Induced Radial Transport within an "Artificial Radiation Belt"

1997 ◽  
Vol 07 (C4) ◽  
pp. C4-307-C4-318 ◽  
Author(s):  
M. E. Mauel
Keyword(s):  
Radiation Belt ◽  
Radial Transport ◽  
Wave Induced

Corotating drift resonant electrons in Saturn's radiation belt: theory and observational evidence

2020 ◽  
Author(s):  
Yixin Hao ◽  
Yixin Sun ◽  
Elias Roussos ◽  
Ying Liu ◽  
Chongjing Yuan ◽  
...  
Keyword(s):  
Electric Field ◽  
Test Particle ◽  
Equatorial Plane ◽  
Radiation Belt ◽  
Observational Evidence ◽  
Diagnostic Feature ◽  
Electron Radiation ◽  
Radial Transport ◽  
Resonant Energy ◽  
Particle Simulations

<p>Corotating drift resonant (CDR) electrons, of which the gradient and curvature drift could cancel the corotation around the Saturn, could get efficiently radial transported when exposed to the Saturnian global convective electric field. Such fast radial transport could lead to significant adiabatic acceleration and therefore supply for the electron radiation belt population. In this work, the nonlinear trapping nature of the corotating drift resonance is investigated. Electrons trapped inside the resonant island preform a banana-like orbit in the equatorial plane. We present an estimation of the trapping limit in L shell and energy for the resonant electrons with varying first adiabatic invariant, which could be directly compared to CASSINI observations. The estimation of the trapping period also indicates that trapped electrons takes times of more hours to close their orbit than the traveling electrons. The evolution in energy spectrogram driven by Saturn's convection and corotation has also been predicted by our test particle simulations. We suggest  that the bifurcation of the 'zebra stripes' near the corotation drift resonant energy could be a diagnostic feature of the nonlinear CDR. Observations from MIMI/LEMMS with similar zebra stripes and the bifurcation have been found as predicted, proving that the electrons in Saturn's radiation belt are being transported radially by the convection and that corotating drift resonant could be a significant candidate for the plenishing of the Saturn's electron radiation belt.   </p>

scholarly journals Enhanced radial transport and energization of radiation belt electrons due to drift orbit bifurcations

2014 ◽  
Vol 119 (1) ◽  
pp. 163-170 ◽  
Author(s):  
A. Y. Ukhorskiy ◽  
M. I. Sitnov ◽  
R. M. Millan ◽  
B. T. Kress ◽  
D. C. Smith
Keyword(s):  
Radiation Belt ◽  
Radial Transport ◽  
Radiation Belt Electrons

scholarly journals Radial transport of radiation belt electrons due to stormtime Pc5 waves

2009 ◽  
Vol 27 (5) ◽  
pp. 2173-2181 ◽  
Author(s):  
A. Y. Ukhorskiy ◽  
M. I. Sitnov ◽  
K. Takahashi ◽  
B. J. Anderson
Keyword(s):  
Solar Wind ◽  
Radiation Belt ◽  
Electron Interaction ◽  
Ulf Waves ◽  
Electron Drift ◽  
Radial Transport ◽  
Drift Motion ◽  
The Third ◽  
Third Invariant ◽  
Azimuthal Wave

Abstract. During geomagnetic storms relativistic electron fluxes in the outer radiation belt exhibit dynamic variability over multiple orders of magnitude. This requires radial transport of electrons across their drift shells and implies violation of their third adiabatic invariant. Radial transport is induced by the interaction of the electron drift motion with electric and magnetic field fluctuations in the ULF frequency range. It was previously shown that solar-wind driven ULF waves have long azimuthal wave lengths and thus can violate the third invariant of trapped electrons in the process of resonant interaction with their gradient-curvature motion. However, the amplitude of solar-wind driven ULF waves rapidly decreases with decreasing L. It is therefore not clear what mechanisms are responsible for fast transport rates observed inside the geosynchronous orbit. In this paper we investigate wether stormtime Pc5 waves can contribute to this process. Stormtime Pc5s have short azimuthal wave lengths and therefore cannot exhibit resonance with the the electron drift motion. However we show that stormtime Pc5s can cause localized random scattering of electron drift motion that violates the third invariant. According to our results electron interaction with stormtime Pc5s can produce rapid radial transport even as low as L≃4. Numerical simulations show that electron transport can exhibit large deviations from radial diffusion. The diffusion approximation is not valid for individual storms but only applies to the statistically averaged response of the outer belt to stormtime Pc5 waves.

Wave-induced precipitation as a loss process for radiation belt particles

1985 ◽  
Vol 5 (4) ◽  
pp. 243-245 ◽  
Author(s):  
U.S. Inan ◽  
H.C. Chang ◽  
R.A. Helliwell ◽  
J.P. Katsufrakis ◽  
W.L. Imhof ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Loss Process ◽  
Wave Induced

Radial transport of radiation belt electrons in kinetic field-line resonances

2017 ◽  
Vol 44 (16) ◽  
pp. 8140-8148 ◽  
Author(s):  
C. C. Chaston ◽  
J. W. Bonnell ◽  
J. R. Wygant ◽  
G. D. Reeves ◽  
D. N. Baker ◽  
...  
Keyword(s):  
Field Line ◽  
Radiation Belt ◽  
Radial Transport ◽  
Field Line Resonances ◽  
Radiation Belt Electrons ◽  
Kinetic Field

On radio-frequency wave-induced radial transport and wave helicity

1993 ◽  
Vol 49 (1) ◽  
pp. 55-62 ◽  
Author(s):  
V. A. Petržílka
Keyword(s):  
Radio Frequency ◽  
Cyclotron Resonance ◽  
Ion Cyclotron Resonance ◽  
Wave Polarization ◽  
Radial Transport ◽  
Magnetostatic Field ◽  
Frequency Wave ◽  
Ion Cyclotron ◽  
Radio Frequency Wave ◽  
Wave Induced

Expressions for wave-induced radial transport are derived, allowing simple estimates to be obtained. The transport is enhanced owing to the presence of a poloidal magnetostatic field and in the vicinity of ion-cyclotron resonance. The direction of the wave-induced transport also depends on the wave polarization.

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