scholarly journals Whistler mode waves and related energetic electron precipitations in the planetary magnetospheres

2019 ◽  
Author(s):  
Hiroyasu Tadokoro ◽  
Yoshizumi Miyoshi ◽  
Hisao Yamagishi ◽  
Hiroshi Miyaoka ◽  
Yoshimasa Tanaka ◽  
...  
Keyword(s):  
Energetic Electron ◽  
Whistler Mode ◽  
Planetary Magnetospheres ◽  
Whistler Mode Waves

scholarly journals Quantification of Energetic Electron Precipitation Driven by Plume Whistler Mode Waves, Plasmaspheric Hiss, and Exohiss

2019 ◽  
Vol 46 (7) ◽  
pp. 3615-3624 ◽  
Author(s):  
W. Li ◽  
X.‐C. Shen ◽  
Q. Ma ◽  
L. Capannolo ◽  
R. Shi ◽  
...  
Keyword(s):  
Energetic Electron ◽  
Electron Precipitation ◽  
Whistler Mode ◽  
Whistler Mode Waves

scholarly journals Storm-Time Features of the Ionospheric ELF/VLF Waves and Energetic Electron Fluxes Revealed by the China Seismo-Electromagnetic Satellite

2021 ◽  
Vol 11 (6) ◽  
pp. 2617
Author(s):  
Zeren Zhima ◽  
Yunpeng Hu ◽  
Xuhui Shen ◽  
Wei Chu ◽  
Mirko Piersanti ◽  
...  
Keyword(s):  
Geomagnetic Activity ◽  
Radiation Belt ◽  
Energetic Electron ◽  
Outer Radiation Belt ◽  
Whistler Mode ◽  
Energetic Electrons ◽  
Intense Storm ◽  
Storm Evolution ◽  
Whistler Mode Waves ◽  
Vlf Waves

This study reports the temporal and spatial distributions of the extremely/very low frequency (ELF/VLF) wave activities and the energetic electron fluxes in the ionosphere during an intense storm (geomagnetic activity index Dst of approximately −174 nT) that occurred on 26 August 2018, based on the observations by a set of detectors onboard the China Seismo-Electromagnetic Satellite (CSES). A good correlation of the ionospheric ELF/VLF wave activities with energetic electron precipitations during the various storm evolution phases was revealed. The strongest ELF/VLF emissions at a broad frequency band extending up to 20 kHz occurred from the near-end main phase to the early recovery phase of the storm, while the wave activities mainly appeared at the frequency range below 6 kHz during other phases. Variations in the precipitating fluxes were also spotted in correspondence with changing geomagnetic activity, with the max values primarily appearing outside of the plasmapause during active conditions. The energetic electrons at energies below 1.5 MeV got strong enhancements during the whole storm time on both the day and night side. Examinations of the half-orbit data showed that under the quiet condition, the CSES was able to depict the outer/inner radiation belt as well as the slot region well, whereas under disturbed conditions, such regions became less sharply defined. The regions poleward from geomagnetic latitudes over 50° were found to host the most robust electron precipitation regardless of the quiet or active conditions, and in the equatorward regions below 30°, flux enhancements were mainly observed during storm time and only occasionally in quiet time. The nightside ionosphere also showed remarkable temporal variability along with the storm evolution process but with relatively weaker wave activities and similar level of fluxes enhancement compared to the ones in the dayside ionosphere. The ELF/VLF whistler-mode waves recorded by the CSES mainly included structure-less VLF waves, structured VLF quasi-periodic emissions, and structure-less ELF hiss waves. A wave vector analysis showed that during storm time, these ELF/VLF whistler-mode waves obliquely propagated, mostly likely from the radiation belt toward the Earth direction. We suggest that energetic electrons in the high latitude ionosphere are most likely transported from the outer radiation belt as a consequence of their interactions with ELF/VLF waves.

Statistical Study of Pitch Angle Diffusion during Substorm Injections

2020 ◽  
Author(s):  
Reihaneh Ghaffari ◽  
Christopher Cully
Keyword(s):  
Pitch Angle ◽  
Energetic Electron ◽  
Loss Cone ◽  
Linear Diffusion ◽  
Whistler Mode ◽  
Wave Measurements ◽  
Whistler Mode Waves ◽  
Substorm Injection ◽  
Injection Region

<p>Energetic Electron Precipitation (EEP) associated with substorm injections typically occurs when magnetospheric waves, particularly whistler-mode waves, resonantly interact with electrons to affect their equatorial pitch angle. This can be considered as a diffusion process that scatters particles into the loss cone. In this study, we investigate whistler-mode wave generation in conjunction with electron injections using in-situ wave measurements by the Themis mission. We calculate the pitch angle diffusion coefficient exerted by the observed wave activity using the quasi-linear diffusion approximation and estimate scattering efficiency in the substorm injection region to constrain where and how much scattering happens typically during these events.</p>

scholarly journals Radio waves and whistler-mode waves in solar wind and their interactions with energetic electrons

2020 ◽  
Author(s):  
Cynthia Cattell ◽  
Aaron Breneman ◽  
Lindsay Glesener ◽  
Ben Leiran ◽  
Ben Short ◽  
...  
Keyword(s):  
Solar Wind ◽  
Radio Waves ◽  
Whistler Mode ◽  
Energetic Electrons ◽  
Whistler Mode Waves
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