scholarly journals Rapid Electron Acceleration in Low‐Density Regions of Saturn's Radiation Belt by Whistler Mode Chorus Waves

2019 ◽  
Vol 46 (13) ◽  
pp. 7191-7198 ◽  
Author(s):  
E. E. Woodfield ◽  
S. A. Glauert ◽  
J. D. Menietti ◽  
T. F. Averkamp ◽  
R. B. Horne ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Electron Acceleration ◽  
Low Density ◽  
Whistler Mode ◽  
Chorus Waves

scholarly journals Resonant diffusion of radiation belt energetic electrons by field-aligned propagation whistler-mode chorus waves

2008 ◽  
Vol 57 (12) ◽  
pp. 7937
Author(s):  
Ni Bin-Bin ◽  
Zhao Zheng-Yu ◽  
Gu Xu-Dong ◽  
Wang Feng
Keyword(s):  
Radiation Belt ◽  
Whistler Mode ◽  
Energetic Electrons ◽  
Chorus Waves

Radiation belt electron acceleration during periods of low plasma density

2021 ◽  
Author(s):  
Hayley Allison ◽  
Yuri Shprits ◽  
Irina Zhelavskaya ◽  
Dedong Wang ◽  
Artem Smirnov
Keyword(s):  
Plasma Density ◽  
Cold Plasma ◽  
Radiation Belt ◽  
Electron Acceleration ◽  
Number Density ◽  
Chorus Waves ◽  
Radiation Belt Electrons ◽  
Plasma Depletion

<p>Electrons in the Van Allen radiation belts can have energies in excess of 7 MeV. We present a unique way of analyzing phase space density data which demonstrates that local acceleration is capable of heating electrons up to 7 MeV. The Van Allen Probes mission not only provided unique measurements of ultra-relativistic radiation belt electrons, but also simultaneous observations of plasma waves that allowed for the routine inference of total plasma number density. Based on long-term observations, we show that the underlying plasma density has a controlling effect over local acceleration to ultra-relativistic energies, which occurs only when the plasma number density drops down to very low values (~10 cm<sup>-3</sup>). The VERB-2D model is used to simulate ultra-relativistic electron acceleration during an event which exhibits an extreme cold plasma depletion. The results show that a reduced electron plasma density allows chorus waves to efficiently resonate with electrons up to ultra-relativistic energies, producing enhancements from 100s of keV up to >7 MeV via local diffusive acceleration. We analyse statistically the observed chorus wave power during ultra-relativistic enhancement events, considering the contribution from both upper and lower band chorus waves. The PINE density model allows for the investigation of global magnetospheric density changes. We analyze the how the global cold plasma density changes during ultra-relativistic enhancement events and compare to in-situ point measurements of the plasma density.</p>

Chorus acceleration of relativistic electrons in extremely low L-shell during geomagnetic storm

2020 ◽  
Author(s):  
Zhenxia Zhang ◽  
Lunjin Chen ◽  
Si Liu ◽  
Ying Xiong ◽  
Xinqiao Li ◽  
...  
Keyword(s):  
Geomagnetic Storm ◽  
Radiation Belt ◽  
Electron Acceleration ◽  
Acceleration Process ◽  
Relativistic Electrons ◽  
Chorus Waves ◽  
Van Allen Probes ◽  
New Finding ◽  
First Time ◽  
Shell Region

<p>Based on data from the Van Allen Probes and ZH-1 satellites, relativistic electron enhancements in extremely low L-shell Regions (reaching L~3) were observed during major geomagnetic storm (minimum Dst`-190 nT).  Contrary to what occurs in the outer belt, such an intense and deep electron penetration event is rare and more interesting. Strong whistler-mode (chorus and hiss) waves, with amplitudes 81-126 pT, were also observed in the extremely low L-shell simultaneously (reaching L~2.5) where the plasmapause was suppressed. The bounce-averaged diffusion coefficient calculations support that the chorus waves can play a significantly important role in diffusing and accelerating the 1-3 MeV electrons even in such low L-shells during storms. This is the first time that the electron acceleration induced by chorus waves in the extremely low L-shell region is reported. This new finding will help to deeply understand the electron acceleration process in radiation belt physics.</p>

scholarly journals Radiation belt electron acceleration by chorus waves during the 17 March 2013 storm

2014 ◽  
Vol 119 (6) ◽  
pp. 4681-4693 ◽  
Author(s):  
W. Li ◽  
R. M. Thorne ◽  
Q. Ma ◽  
B. Ni ◽  
J. Bortnik ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Electron Acceleration ◽  
Chorus Waves

scholarly journals Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Y. Miyoshi ◽  
K. Hosokawa ◽  
S. Kurita ◽  
S.-I. Oyama ◽  
Y. Ogawa ◽  
...  
Keyword(s):  
High Energy ◽  
Daily Basis ◽  
Maximum Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Whistler Mode ◽  
Chorus Waves ◽  
Mesospheric Ozone ◽  
Field Lines ◽  
Eiscat Radar

AbstractPulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated electrons and its impacts on the atmosphere are unknown. Herein, we report unique observations by the European Incoherent Scatter (EISCAT) radar showing electron precipitations ranging from a few hundred keV to a few MeV during a PsA associated with a weak geomagnetic storm. Simultaneously, the Arase spacecraft has observed intense whistler-mode chorus waves at the conjugate location along magnetic field lines. A computer simulation based on the EISCAT observations shows immediate catalytic ozone depletion at the mesospheric altitudes. Since PsA occurs frequently, often in daily basis, and extends its impact over large MLT areas, we anticipate that the PsA possesses a significant forcing to the mesospheric ozone chemistry in high latitudes through high energy electron precipitations. Therefore, the generation of PsA results in the depletion of mesospheric ozone through high-energy electron precipitations caused by whistler-mode chorus waves, which are similar to the well-known effect due to solar energetic protons triggered by solar flares.

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