scholarly journals The outer radiation belt response to the storm time development of seed electrons and chorus wave activity during CME and CIR storms

2018 ◽  
Author(s):  
S. T. Bingham ◽  
C. G. Mouikis ◽  
L. M. Kistler ◽  
A. J. Boyd ◽  
K. Paulson ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Wave Activity ◽  
Time Development ◽  
Outer Radiation Belt ◽  
Chorus Wave

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 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 The Storm Time Development of Source Electrons and Chorus Wave Activity During CME‐ and CIR‐Driven Storms

2019 ◽  
Vol 124 (8) ◽  
pp. 6438-6452 ◽  
Author(s):  
S. T. Bingham ◽  
C. G. Mouikis ◽  
L. M. Kistler ◽  
K. W. Paulson ◽  
C. J. Farrugia ◽  
...  
Keyword(s):  
Wave Activity ◽  
Time Development ◽  
Chorus Wave

scholarly journals Association of radiation belt electron enhancements with earthward penetration of Pc5 ULF waves: a case study of intense 2001 magnetic storms

2015 ◽  
Vol 33 (11) ◽  
pp. 1431-1442 ◽  
Author(s):  
M. Georgiou ◽  
I. A. Daglis ◽  
E. Zesta ◽  
G. Balasis ◽  
I. R. Mann ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Low Frequency ◽  
Recovery Phase ◽  
Wave Activity ◽  
Magnetic Storms ◽  
Ulf Waves ◽  
Relativistic Electrons ◽  
Outer Radiation Belt ◽  
Magnetometer Arrays ◽  
The One

Abstract. Geospace magnetic storms, driven by the solar wind, are associated with increases or decreases in the fluxes of relativistic electrons in the outer radiation belt. We examine the response of relativistic electrons to four intense magnetic storms, during which the minimum of the Dst index ranged from −105 to −387 nT, and compare these with concurrent observations of ultra-low-frequency (ULF) waves from the trans-Scandinavian IMAGE magnetometer network and stations from multiple magnetometer arrays available through the worldwide SuperMAG collaboration. The latitudinal and global distribution of Pc5 wave power is examined to determine how deep into the magnetosphere these waves penetrate. We then investigate the role of Pc5 wave activity deep in the magnetosphere in enhancements of radiation belt electrons population observed in the recovery phase of the magnetic storms. We show that, during magnetic storms characterized by increased post-storm electron fluxes as compared to their pre-storm values, the earthward shift of peak and inner boundary of the outer electron radiation belt follows the Pc5 wave activity, reaching L shells as low as 3–4. In contrast, the one magnetic storm characterized by irreversible loss of electrons was related to limited Pc5 wave activity that was not intensified at low L shells. These observations demonstrate that enhanced Pc5 ULF wave activity penetrating deep into the magnetosphere during the main and recovery phase of magnetic storms can, for the cases examined, distinguish storms that resulted in increases in relativistic electron fluxes in the outer radiation belts from those that did not.

scholarly journals Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment

2008 ◽  
Vol 26 (11) ◽  
pp. 3269-3277 ◽  
Author(s):  
D. Pokhotelov ◽  
F. Lefeuvre ◽  
R. B. Horne ◽  
N. Cornilleau-Wehrlin
Keyword(s):  
Plasma Wave ◽  
Radiation Belt ◽  
Plasma Waves ◽  
Wave Activity ◽  
Radiation Belts ◽  
Statistical Distributions ◽  
Outer Radiation Belt ◽  
Wave Parameters ◽  
Activity Indices

Abstract. Various types of plasma waves have profound effects on acceleration and scattering of radiation belt particles. For the purposes of radiation belt modeling it is necessary to know statistical distributions of plasma wave parameters. This paper analyzes four years of plasma wave observations in the Earth's outer radiation belt obtained by the STAFF-SA experiment on board Cluster spacecraft. Statistical distributions of spectral density of different plasma waves observed in ELF-VLF range (chorus, plasmaspheric hiss, magnetosonic waves) are presented as a function of magnetospheric coordinates and geomagnetic activity indices. Comparison with other spacecraft studies supports some earlier conclusions about the distribution of chorus and hiss waves and helps to remove the long-term controversy regarding the distribution of equatorial magnetosonic waves. This study represents a step towards the development of multi-spacecraft database of plasma wave activity in radiation belts.

scholarly journals Combined effects of concurrent Pc5 and chorus waves on relativistic electron dynamics

2015 ◽  
Vol 33 (9) ◽  
pp. 1173-1181 ◽  
Author(s):  
C. Katsavrias ◽  
I. A. Daglis ◽  
W. Li ◽  
S. Dimitrakoudis ◽  
M. Georgiou ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Geomagnetic Storms ◽  
Wave Activity ◽  
Electron Dynamics ◽  
Interplanetary Coronal Mass Ejections ◽  
Outer Radiation Belt ◽  
Outward Diffusion ◽  
Electron Population ◽  
Chorus Waves ◽  
Chorus Wave

Abstract. We present electron phase space density (PSD) calculations as well as concurrent Pc5 and chorus wave activity observations during two intense geomagnetic storms caused by interplanetary coronal mass ejections (ICMEs) resulting in contradicting net effect. We show that, during the 17 March 2013 storm, the coincident observation of chorus and relativistic electron enhancements suggests that the prolonged chorus wave activity seems to be responsible for the enhancement of the electron population in the outer radiation belt even in the presence of pronounced outward diffusion. On the other hand, the significant depletion of electrons, during the 12 September 2014 storm, coincides with long-lasting outward diffusion driven by the continuous enhanced Pc5 activity since chorus wave activity was limited both in space and time.

Peculiarities of the outer radiation belt dynamics during the strong magnetic storm of May 15, 2005

2007 ◽  
Vol 47 (6) ◽  
pp. 696-703 ◽  
Author(s):  
L. V. Tverskaya ◽  
E. A. Ginzburg ◽  
T. A. Ivanova ◽  
N. N. Pavlov ◽  
P. M. Svidsky
Keyword(s):  
Magnetic Storm ◽  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Strong Magnetic Storm
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