scholarly journals REPAD: An empirical model of pitch angle distributions for energetic electrons in the Earth's outer radiation belt

2014 ◽  
Vol 119 (3) ◽  
pp. 1693-1708 ◽  
Author(s):  
Yue Chen ◽  
Reiner H. W. Friedel ◽  
Michael G. Henderson ◽  
Seth G. Claudepierre ◽  
Steven K. Morley ◽  
...  
Keyword(s):  
Empirical Model ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Energetic Electrons

Statistical studies of energetic electrons in the outer radiation belt

1999 ◽  
Vol 30 (5) ◽  
pp. 625-632 ◽  
Author(s):  
A.D. Johnstone ◽  
D.J. Rodgers ◽  
G.H. Jones
Keyword(s):  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Statistical Studies

scholarly journals Field-aligned chorus wave spectral power in Earth's outer radiation belt

2015 ◽  
Vol 33 (5) ◽  
pp. 583-597 ◽  
Author(s):  
H. Breuillard ◽  
O. Agapitov ◽  
A. Artemyev ◽  
E. A. Kronberg ◽  
S. E. Haaland ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Radiation Belt ◽  
Spectral Power ◽  
Peak Frequency ◽  
Wave Power ◽  
Outer Radiation Belt ◽  
Substantial Impact ◽  
Wide Range ◽  
Frequency Variations ◽  
Chorus Wave

Abstract. Chorus-type whistler waves are one of the most intense electromagnetic waves generated naturally in the magnetosphere. These waves have a substantial impact on the radiation belt dynamics as they are thought to contribute to electron acceleration and losses into the ionosphere through resonant wave–particle interaction. Our study is devoted to the determination of chorus wave power distribution on frequency in a wide range of magnetic latitudes, from 0 to 40°. We use 10 years of magnetic and electric field wave power measured by STAFF-SA onboard Cluster spacecraft to model the initial (equatorial) chorus wave spectral power, as well as PEACE and RAPID measurements to model the properties of energetic electrons (~ 0.1–100 keV) in the outer radiation belt. The dependence of this distribution upon latitude obtained from Cluster STAFF-SA is then consistently reproduced along a certain L-shell range (4 ≤ L ≤ 6.5), employing WHAMP-based ray tracing simulations in hot plasma within a realistic inner magnetospheric model. We show here that, as latitude increases, the chorus peak frequency is globally shifted towards lower frequencies. Making use of our simulations, the peak frequency variations can be explained mostly in terms of wave damping and amplification, but also cross-L propagation. These results are in good agreement with previous studies of chorus wave spectral extent using data from different spacecraft (Cluster, POLAR and THEMIS). The chorus peak frequency variations are then employed to calculate the pitch angle and energy diffusion rates, resulting in more effective pitch angle electron scattering (electron lifetime is halved) but less effective acceleration. These peak frequency parameters can thus be used to improve the accuracy of diffusion coefficient calculations.

scholarly journals On the radiation belt location during the 23rd and 24th solar cycles

2019 ◽  
Vol 37 (4) ◽  
pp. 719-732
Author(s):  
Alexei V. Dmitriev
Keyword(s):  
North American ◽  
Geomagnetic Field ◽  
Radiation Belt ◽  
Occurrence Rate ◽  
Solar Cycles ◽  
Geomagnetic Jerk ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Eastern Hemisphere

Abstract. Within the last two solar cycles (from 2001 to 2018), the location of the outer radiation belt (ORB) was determined using NOAA/Polar-orbiting Operational Environmental Satellite (POES) observations of energetic electrons with energies above 30 keV. It was found that the ORB was shifted a little (∼1∘) in the European and North American sectors, while in the Siberian sector the ORB was displaced equatorward by more than 3∘. The displacements corresponded qualitatively to the change in the geomagnetic field predicted by the IGRF-12 model. However, in the Siberian sector, the model has a tendency to underestimate the equatorward shift of the ORB. The shift became prominent after 2012, which might have been related to a geomagnetic “jerk” that occurred in 2012–2013. The displacement of the ORB to lower latitudes in the Siberian sector can contribute to an increase in the occurrence rate of midlatitude auroras observed in the Eastern Hemisphere.

scholarly journals Empirical model of lower band chorus wave distribution in the outer radiation belt

2015 ◽  
Vol 120 (12) ◽  
pp. 10,425-10,442 ◽  
Author(s):  
O. V. Agapitov ◽  
A. V. Artemyev ◽  
D. Mourenas ◽  
F. S. Mozer ◽  
V. Krasnoselskikh
Keyword(s):  
Empirical Model ◽  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Lower Band ◽  
Wave Distribution ◽  
Chorus Wave

scholarly journals Statistical model of electron pitch angle diffusion in the outer radiation belt

2012 ◽  
Vol 117 (A8) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. Artemyev ◽  
O. Agapitov ◽  
V. Krasnoselskikh ◽  
H. Breuillard ◽  
G. Rolland
Keyword(s):  
Statistical Model ◽  
Pitch Angle ◽  
Radiation Belt ◽  
Outer Radiation Belt

scholarly journals Modeling inward diffusion and slow decay of energetic electrons in the Earth's outer radiation belt

2015 ◽  
Vol 42 (4) ◽  
pp. 987-995 ◽  
Author(s):  
Q. Ma ◽  
W. Li ◽  
R. M. Thorne ◽  
B. Ni ◽  
C. A. Kletzing ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Slow Decay
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