scholarly journals Radiation belt electron dynamics at low L (<4): Van Allen Probes era versus previous two solar cycles

2017 ◽  
Vol 122 (5) ◽  
pp. 5224-5234 ◽  
Author(s):  
X. Li ◽  
D. N. Baker ◽  
H. Zhao ◽  
K. Zhang ◽  
A. N. Jaynes ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Electron Dynamics ◽  
Solar Cycles ◽  
Van Allen Probes

Modeling Radiation Belt Electron Dynamics with the DREAM3D Diffusion Model

2014 ◽  
Author(s):  
Weichao Tu ◽  
Gregory S. Cunningham ◽  
Yue Chen ◽  
Michael G. Henderson ◽  
Steven K. Morley ◽  
...  
Keyword(s):  
Diffusion Model ◽  
Radiation Belt ◽  
Electron Dynamics

Statistical study of the storm time radiation belt evolution during Van Allen Probes era: CME- versus CIR-driven storms

2017 ◽  
Vol 122 (8) ◽  
pp. 8327-8339 ◽  
Author(s):  
Xiao-Chen Shen ◽  
Mary K. Hudson ◽  
Allison N. Jaynes ◽  
Quanqi Shi ◽  
Anmin Tian ◽  
...  
Keyword(s):  
Radiation Belt ◽  
Statistical Study ◽  
Van Allen Probes

Simulations of the Relativistic Radiation Belt Electrons Using the VERB-3D Code

2021 ◽  
Author(s):  
Dedong Wang ◽  
Yuri Shprits ◽  
Alexander Drozdov ◽  
Nikita Aseev ◽  
Irina Zhelavskaya ◽  
...  
Keyword(s):  
Space Weather ◽  
Radiation Belt ◽  
Model Performance ◽  
Dynamic Evolution ◽  
Relativistic Electrons ◽  
Outer Radiation Belt ◽  
Chorus Waves ◽  
Van Allen Probes ◽  
Radiation Belt Electrons ◽  
Simulation Results

&lt;p&gt;Using the three-dimensional Versatile Electron Radiation Belt (VERB-3D) code, we perform simulations to investigate the dynamic evolution of relativistic electrons in the Earth&amp;#8217;s outer radiation belt. In our simulations, we use data from the Geostationary Operational Environmental Satellites (GOES) to set up the outer boundary condition, which is the only data input for simulations. The magnetopause shadowing effect is included by using last closed drift shell (LCDS), and it is shown to significantly contribute to the dropouts of relativistic electrons at high $L^*$. We validate our simulation results against measurements from Van Allen Probes. In long-term simulations, we test how the latitudinal dependence of chorus waves can affect the dynamics of the radiation belt electrons. Results show that the variability of chorus waves at high latitudes is critical for modeling of megaelectron volt (MeV) electrons. We show that, depending on the latitudinal distribution of chorus waves under different geomagnetic conditions, they cannot only produce a net acceleration but also a net loss of MeV electrons. Decrease in high&amp;#8208;latitude chorus waves can tip the balance between acceleration and loss toward acceleration, or alternatively, the increase in high&amp;#8208;latitude waves can result in a net loss of MeV electrons. Variations in high&amp;#8208;latitude chorus may account for some of the variability of MeV electrons.&amp;#160;&lt;/p&gt;&lt;p&gt;Our simulation results for the NSF GEM Challenge Events show that the position of the plasmapause plays a significant role in the dynamic evolution of relativistic electrons. We also perform simulations for the COSPAR International Space Weather Action Team (ISWAT) Challenge for the year 2017. The COSPAR ISWAT is a global hub for collaborations addressing challenges across the field of space weather. One of the objectives of the G3-04 team &amp;#8220;Internal Charging Effects and the Relevant Space Environment&amp;#8221; is model performance assessment and improvement. One of the expected outputs is a more systematic assessment of model performance under different conditions. The G3-04 team proposed performing benchmarking challenge runs. We &amp;#8216;fly&amp;#8217; a virtual satellite through our simulation results and compare the simulated differential electron fluxes at 0.9 MeV and 57.27 degrees local pitch-angle with the fluxes measured by the Van Allen Probes. In general, our simulation results show good agreement with observations. We calculated several different matrices to validate our simulation results against satellite observations.&lt;/p&gt;

scholarly journals On the radiation belt location during the 23rd and 24th solar cycles

2019 ◽  
Vol 37 (4) ◽  
pp. 719-732
Author(s):  
Alexei V. Dmitriev
Keyword(s):  
North American ◽  
Geomagnetic Field ◽  
Radiation Belt ◽  
Occurrence Rate ◽  
Solar Cycles ◽  
Geomagnetic Jerk ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Eastern Hemisphere

Abstract. Within the last two solar cycles (from 2001 to 2018), the location of the outer radiation belt (ORB) was determined using NOAA/Polar-orbiting Operational Environmental Satellite (POES) observations of energetic electrons with energies above 30 keV. It was found that the ORB was shifted a little (∼1∘) in the European and North American sectors, while in the Siberian sector the ORB was displaced equatorward by more than 3∘. The displacements corresponded qualitatively to the change in the geomagnetic field predicted by the IGRF-12 model. However, in the Siberian sector, the model has a tendency to underestimate the equatorward shift of the ORB. The shift became prominent after 2012, which might have been related to a geomagnetic “jerk” that occurred in 2012–2013. The displacement of the ORB to lower latitudes in the Siberian sector can contribute to an increase in the occurrence rate of midlatitude auroras observed in the Eastern Hemisphere.

Variation of Radiation Belt Electron Flux During CME‐ and CIR‐Driven Geomagnetic Storms: Van Allen Probes Observations

2019 ◽  
Vol 124 (8) ◽  
pp. 6524-6540 ◽  
Author(s):  
Megha Pandya ◽  
Veenadhari Bhaskara ◽  
Yusuke Ebihara ◽  
Shrikanth G. Kanekal ◽  
Daniel N. Baker
Keyword(s):  
Radiation Belt ◽  
Electron Flux ◽  
Geomagnetic Storms ◽  
Van Allen Probes
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