A numerical study on the resonant scattering process of relativistic electrons via whistler-mode waves in the outer radiation belt

2005 ◽  
pp. 33-39 ◽  
Author(s):  
Yuto Katoh ◽  
Takayuki Ono ◽  
Masahide Iizima
Keyword(s):  
Radiation Belt ◽  
Numerical Study ◽  
Resonant Scattering ◽  
Relativistic Electrons ◽  
Scattering Process ◽  
Outer Radiation Belt ◽  
Whistler Mode ◽  
Whistler Mode Waves

scholarly journals Statistics of whistler mode waves in the outer radiation belt: Cluster STAFF‐SA measurements

2013 ◽  
Vol 118 (6) ◽  
pp. 3407-3420 ◽  
Author(s):  
Oleksiy Agapitov ◽  
Anton Artemyev ◽  
Vladimir Krasnoselskikh ◽  
Yuri V. Khotyaintsev ◽  
Didier Mourenas ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Whistler Mode ◽  
Whistler Mode Waves

Statistical Occurrence and Distribution of High‐Amplitude Whistler Mode Waves in the Outer Radiation Belt

2019 ◽  
Vol 46 (5) ◽  
pp. 2328-2336 ◽  
Author(s):  
E. Tyler ◽  
A. Breneman ◽  
C. Cattell ◽  
J. Wygant ◽  
S. Thaller ◽  
...  
Keyword(s):  
Radiation Belt ◽  
High Amplitude ◽  
Outer Radiation Belt ◽  
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.

scholarly journals Roles of whistler mode waves and magnetosonic waves in changing the outer radiation belt and the slot region

2017 ◽  
Vol 122 (5) ◽  
pp. 5431-5448 ◽  
Author(s):  
L. Y. Li ◽  
J. Yu ◽  
J. B. Cao ◽  
J. Y. Yang ◽  
X. Li ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Outer Radiation Belt ◽  
Whistler Mode ◽  
Whistler Mode Waves

Radial diffusion coefficients database in the frame of SafeSpace project

2021 ◽  
Author(s):  
Christos Katsavrias ◽  
Ioannis A. Daglis ◽  
Afroditi Nasi ◽  
Constantinos Papadimitriou ◽  
Marina Georgiou
Keyword(s):  
Diffusion Coefficients ◽  
Radiation Belt ◽  
Field Measurements ◽  
Radial Diffusion ◽  
Relativistic Electrons ◽  
Outer Radiation Belt ◽  
Horizon 2020 ◽  
Research And Innovation ◽  
The Difference ◽  
Cycle 24

<p>Radial diffusion has been established as one of the most important mechanisms contributing the acceleration and loss of relativistic electrons in the outer radiation belt. Over the past few years efforts have been devoted to provide empirical relationships of radial diffusion coefficients (D<sub>LL</sub>) for radiation belt simulations yet several studies have suggested that the difference between the various models can be orders of magnitude different at high levels of geomagnetic activity as the observed D<sub>LL</sub> have been shown to be highly event-specific. In the frame of SafeSpace project we have used 12 years (2009 – 2020) of multi-point magnetic and electric field measurements from THEMIS A, D and E satellites to create a database of calculated D<sub>LL</sub>. In this work we present the first statistics on the evolution of D<sub>LL </sub>during the various phases of Solar cycle 24 with respect to the various solar wind parameters and geomagnetic indices.</p><p>This work has received funding from the European Union's Horizon 2020 research and innovation programme “SafeSpace” under grant agreement No 870437.</p>

On the effect of ULF waves on the outer radiation belt during geomagnetic storms

2021 ◽  
Author(s):  
Christopher Lara ◽  
Pablo S. Moya ◽  
Victor Pinto ◽  
Javier Silva ◽  
Beatriz Zenteno
Keyword(s):  
Relativistic Electron ◽  
Radiation Belt ◽  
Geomagnetic Storms ◽  
Cumulative Effect ◽  
Radiation Belts ◽  
Ulf Waves ◽  
Relativistic Electrons ◽  
Relative Role ◽  
Outer Radiation Belt ◽  
Ulf Wave

<p>The inner magnetosphere is a very important region to study, as with satellite-based communications increasing day after day, possible disruptions are especially relevant due to the possible consequences in our daily life. It is becoming very important to know how the radiation belts behave, especially during strong geomagnetic activity. The radiation belts response to geomagnetic storms and solar wind conditions is still not fully understood, as relativistic electron fluxes in the outer radiation belt can be depleted, enhanced or not affected following intense activity. Different studies show how these results vary in the face of different events. As one of the main mechanisms affecting the dynamics of the radiation belt are wave-particle interactions between relativistic electrons and ULF waves. In this work we perform a statistical study of the relationship between ULF wave power and relativistic electron fluxes in the outer radiation belt during several geomagnetic storms, by using magnetic field and particle fluxes data measured by the Van Allen Probes between 2012 and 2017. We evaluate the correlation between the changes in flux and the cumulative effect of ULF wave activity during the main and recovery phases of the storms for different position in the outer radiation belt and energy channels. Our results show that there is a good correlation between the presence of ULF waves and the changes in flux during the recovery phase of the storm and that correlations vary as a function of energy. Also, we can see in detail how the ULF power change for the electron flux at different L-shell We expect these results to be relevant for the understanding of the relative role of ULF waves in the enhancements and depletions of energetic electrons in the radiation belts for condition described.</p>

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