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Formation of energetic electron butterfly distributions by magnetosonic waves via Landau resonance

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1002/2016GL067853· OSTI ID:1338751
 [1];  [2];  [3];  [4];  [4];  [4];  [3];  [3];  [5];  [3];  [6];  [7];  [7];  [7];  [8];  [9];  [10];  [11];  [12]
  1. Peking Univ., Beijing (China). Inst. of Space Physics and Applied Technology; Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
  2. Wuhan Univ. (China). School of Electronic Information. Dept. of Space Physics
  3. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
  4. Peking Univ., Beijing (China). Inst. of Space Physics and Applied Technology
  5. Univ. of Texas, Dallas, TX (United States). W. B. Hanson Center for Space Sciences. Dept. of Physics
  6. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  7. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  8. The Aerospace Corporation, El Segundo, CA (United States). Space Science Applications Lab.
  9. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Space Science and Applications Group
  10. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  11. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  12. Memorial Univ. of Newfoundland, St. John's, NL (Canada). Dept. of Mathematics and Statistics

Radiation belt electrons can exhibit different types of pitch angle distributions in response to various magnetospheric processes. Butterfly distributions, characterized by flux minima at pitch angles around 90°, are broadly observed in both the outer and inner belts and the slot region. Butterfly distributions close to the outer magnetospheric boundary have been attributed to drift shell splitting and losses to the magnetopause. However, their occurrence in the inner belt and the slot region has hitherto not been resolved. In this study, by analyzing the particle and wave data collected by the Van Allen Probes during a geomagnetic storm, we combine test particle calculations and Fokker-Planck simulations to reveal that scattering by equatorial magnetosonic waves is a significant cause for the formation of energetic electron butterfly distributions in the inner magnetosphere. Finally, another event shows that a large-amplitude magnetosonic wave in the outer belt can create electron butterfly distributions in just a few minutes.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Peking Univ., Beijing (China); Univ. of California, Los Angeles, CA (United States); Wuhan Univ. (China)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); Johns Hopkins University; National Natural Science Foundation of China (NSFC); Nature Science and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1338751
Report Number(s):
LA-UR--16-20481
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 7 Vol. 43; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (32)

Ultrarelativistic electron butterfly distributions created by parallel acceleration due to magnetosonic waves: MS WAVES CREATE BUTTERFLY DISTRIBUTIONS journal April 2016
Radiation belt electron acceleration during the 17 March 2015 geomagnetic storm: Observations and simulations: Radiation Belt Electron Acceleration journal June 2016
Prompt acceleration of magnetospheric electrons to ultrarelativistic energies by the 17 March 2015 interplanetary shock: RAPID ELECTRON ACCELERATION BY IP SHOCK journal August 2016
The Radiation Belt Electron Scattering by Magnetosonic Wave: Dependence on Key Parameters: Electron Scattering by MS Waves journal December 2017
Resonant Scattering of Radiation Belt Electrons by Off‐Equatorial Magnetosonic Waves journal February 2018
Prompt Disappearance and Emergence of Radiation Belt Magnetosonic Waves Induced by Solar Wind Dynamic Pressure Variations journal January 2018
On the Diffusion Rates of Electron Bounce Resonant Scattering by Magnetosonic Waves journal April 2018
Space Weather Effects in the Earth’s Radiation Belts book January 2017
Space Weather Effects in the Earth’s Radiation Belts journal December 2017
Magnetotail dipolarization fronts and particle acceleration: A review journal December 2019
Two-Dimensional Particle-in-Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field journal September 2018
Magnetosonic Harmonic Falling and Rising Frequency Emissions Potentially Generated by Nonlinear Wave‐Wave Interactions in the Van Allen Radiation Belts journal August 2018
Combined Scattering of Outer Radiation Belt Electrons by Simultaneously Occurring Chorus, Exohiss, and Magnetosonic Waves journal October 2018
Evolution of Radiation Belt Electron Pitch Angle Distribution Due to Combined Scattering by Plasmaspheric Hiss and Magnetosonic Waves journal March 2019
An Empirical Model of Radiation Belt Electron Pitch Angle Distributions Based On Van Allen Probes Measurements journal May 2018
Equatorial Noise With Quasiperiodic Modulation: Multipoint Observations by the Van Allen Probes Spacecraft journal June 2018
High‐Frequency Thermal Fluctuations and Instabilities in the Radiation Belt Environment journal November 2018
Earth's Van Allen Radiation Belts: From Discovery to the Van Allen Probes Era journal November 2019
Recent Advancements and Remaining Challenges Associated With Inner Magnetosphere Cross‐Energy/Population Interactions (IMCEPI) journal February 2019
The Evolution of a Pitch‐Angle “Bite‐Out” Scattering Signature Caused by EMIC Wave Activity: A Case Study journal July 2019
Effect of Low‐Harmonic Magnetosonic Waves on the Radiation Belt Electrons Inside the Plasmasphere journal May 2019
An Automatic Detection Algorithm Applied to Fast Magnetosonic Waves With Observations of the Van Allen Probes journal May 2019
A 30-Year Simulation of the Outer Electron Radiation Belt journal October 2018
Quenching of Equatorial Magnetosonic Waves by Substorm Proton Injections journal June 2019
Ion Heating by Electromagnetic Ion Cyclotron Waves and Magnetosonic Waves in the Earth's Inner Magnetosphere journal June 2019
Combined Scattering of Radiation Belt Electrons Caused by Landau and Bounce Resonant Interactions With Magnetosonic Waves journal September 2019
Modeling the Electron Flux Enhancement and Butterfly Pitch Angle Distributions on L Shells <2.5 journal October 2019
Characteristics and Generation of Low‐Frequency Magnetosonic Waves Below the Proton Gyrofrequency journal November 2019
Generation of EMIC Waves and Effects on Particle Precipitation During a Solar Wind Pressure Intensification With B z >0 journal June 2019
Equatorial Propagation of the Magnetosonic Mode Across the Plasmapause: 2‐D PIC Simulations journal June 2019
Global Survey and Empirical Model of Fast Magnetosonic Waves Over Their Full Frequency Range in Earth's Inner Magnetosphere journal December 2019
A full wave model of high-harmonic EMIC wave propagation in sheared magnetic fields journal October 2018

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