Whistler-Mode Waves Modify the High-Energy Electron Slot Region and the Outer Radiation Belt

2008 ◽  
Vol 51 (2) ◽  
pp. 214-222 ◽  
Author(s):  
Liu-Yuan LI ◽  
Jin-Bin CAO ◽  
Guo-Cheng ZHOU
Keyword(s):  
Radiation Belt ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Outer Radiation Belt ◽  
Whistler Mode ◽  
Whistler Mode 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.

scholarly journals Spatial and energy distributions of high energy electron bursts caused by precipitations from the inner radiation belt

2017 ◽  
Author(s):  
Sergey Aleksandrin ◽  
Arkadiy Galper ◽  
Sergei Koldashov ◽  
Vladimir Mikhailov ◽  
Temir Zharaspayev
Keyword(s):  
Radiation Belt ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Energy Distributions

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.

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