scholarly journals Oxygen Ion Dynamics in the Earth's Ring Current: Van Allen Probes Observations

2019 ◽  
Vol 124 (10) ◽  
pp. 7786-7798 ◽  
Author(s):  
Chao Yue ◽  
Jacob Bortnik ◽  
Wen Li ◽  
Qianli Ma ◽  
Chih‐Ping Wang ◽  
...  
Keyword(s):  
Ring Current ◽  
Ion Dynamics ◽  
Oxygen Ion ◽  
Van Allen Probes

Global Distribution of Reversed Energy Spectra of Ring Current Protons Based on Van Allen Probes Observations

2021 ◽  
Vol 48 (4) ◽  
Author(s):  
Juan Yi ◽  
Song Fu ◽  
Binbin Ni ◽  
Xudong Gu ◽  
Man Hua ◽  
...  
Keyword(s):  
Ring Current ◽  
Global Distribution ◽  
Energy Spectra ◽  
Van Allen Probes

Structural Characterization and Ionic Conductivity of Metastable Gd2(Ti0.65Zr0.35)2O7 Powders Prepared by Mechanical Milling

2006 ◽  
Vol 972 ◽  
Author(s):  
Antonio F. Fuentes ◽  
Karla J. Moreno ◽  
Jacobo Santamaria ◽  
Carlos Leon ◽  
Ulises Amador
Keyword(s):  
Ionic Conductivity ◽  
Mechanical Milling ◽  
Sintering Temperature ◽  
Ion Dynamics ◽  
Conductivity Relaxation ◽  
Electrical Conductivity Relaxation ◽  
Ion Interactions ◽  
Oxygen Ion ◽  
Fluorite Type ◽  
Powder Phase

AbstractWe analyze in this work the influence of ordering on the oxygen ion dynamics in the ionic conductor Gd2(Ti0.65Zr0.35)2O7, prepared by mechanical milling. As-prepared powder phase presents a metastable anion deficient fluorite-type of structure below 800°C becoming a disordered pyrochlore above this temperature. Such phase transformation implies a significant increase in the ionic conductivity of this material as a result of a systematic decrease in the activation energy for the dc conductivity, from 1.23 to 0.78 eV. Electrical conductivity relaxation is well described by the Kohlrausch-Williams-Watts (KWW) stretched exponential function with the fractional exponent n decreasing systematically with increasing sintering temperature (increasing ordering) as a result of decreasing ion-ion interactions in better ordered samples.

Local structure and oxygen ion dynamics in La doped ceria: 17O NMR study

2010 ◽  
Vol 181 (29-30) ◽  
pp. 1309-1315 ◽  
Author(s):  
Ivo Heinmaa ◽  
Tanel Joon ◽  
Helgi Kooskora ◽  
Jüri Pahapill ◽  
Juhan Subbi
Keyword(s):  
Local Structure ◽  
Doped Ceria ◽  
Ion Dynamics ◽  
17O Nmr ◽  
Oxygen Ion ◽  
Nmr Study ◽  
La Doped

MLT Dependence of Contribution of Charge Exchange Loss to the Storm Time Ring Current Decay: Van Allen Probes Observations

2020 ◽  
Author(s):  
Songyan Li ◽  
Hao Luo
Keyword(s):  
Charge Exchange ◽  
Ring Current ◽  
Radial Distance ◽  
Recovery Phase ◽  
Local Times ◽  
Loss Mechanism ◽  
Exchange Effect ◽  
Current Decay ◽  
Van Allen Probes ◽  
Level 3

<p>Much evidence has indicated that charge exchange with the neutral atoms is an important loss mechanism of the ring current ions, especially during the slow recovery phase of a geomagnetic storm. Most of the studies, however, were focused on the global effect of the charge exchange on the ring current decay. The effect on different magnetic local times and L shells has not been achieved. In this study, based on the in-situ energetic ion data (Level 3) from RBSPICE onboard two Van Allen Probes, we study the contribution of the charge exchange, calculated from the differential flux of ions, to the local ring current decay at different magnetic local times and radial distance. Results indicate that the charge exchange effect on the ring current decay shows clear MLT and L dependence. Our study provides important information of spatial distribution of the ring current loss evolution, which could be as a reference during the ring current modeling.</p>

scholarly journals The role of small-scale ion injections in the buildup of Earth's ring current pressure: Van Allen Probes observations of the 17 March 2013 storm

2014 ◽  
Vol 119 (9) ◽  
pp. 7327-7342 ◽  
Author(s):  
Matina Gkioulidou ◽  
A. Y. Ukhorskiy ◽  
D. G. Mitchell ◽  
T. Sotirelis ◽  
B. H. Mauk ◽  
...  
Keyword(s):  
Ring Current ◽  
Small Scale ◽  
Van Allen Probes
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