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Found 13 entries in the Bibliography.
Showing entries from 1 through 13
2019 |
As part of its International Capabilities Assessment effort, the Community Coordinated Modeling Center initiated several working teams, one of which is focused on the validation of models and methods for determining auroral electrodynamic parameters, including particle precipitation, conductivities, electric fields, neutral density and winds, currents, Joule heating, auroral boundaries, and ion outflow. Auroral electrodynamic properties are needed as input to space weather models, to test and validate the accuracy of physical models, and to provide needed information for space weather customers and researchers. The working team developed a process for validating auroral electrodynamic quantities that begins with the selection of a set of events, followed by construction of ground truth databases using all available data and assimilative data analysis techniques. Using optimized, predefined metrics, the ground truth data for selected events can be used to assess model performance and improvement over time. The availability of global observations and sophisticated data assimilation techniques provides the means to create accurate ground truth databases routinely and accurately. Robinson, Robert; Zhang, Yongliang; Garcia-Sage, Katherine; Fang, Xiaohua; Verkhoglyadova, Olga; Ngwira, Chigomezyo; Bingham, Suzy; Kosar, Burcu; Zheng, Yihua; Kaeppler, Stephen; Liemohn, Michael; Weygand, James; Crowley, Geoffrey; Merkin, Viacheslav; McGranaghan, Ryan; Mannucci, Anthony; Published by: Space Weather Published on: 01/2019 YEAR: 2019   DOI: 10.1029/2018SW002127 |
Robinson, Robert; Zhang, Yongliang; Garcia-Sage, Katherine; Fang, Xiaohua; Verkhoglyadova, Olga; Ngwira, Chigomezyo; Bingham, Suzy; Kosar, Burcu; Zheng, Yihua; Kaeppler, Stephen; , others; Published by: Space Weather Published on: |
2014 |
A specific imaging spectrometer based on a concentric off-axis dual reflector system is proposed, free of astigmatism and coma. The described imaging spectrometer consists of four spherical mirrors and a plane grating. The analytic theory of aberrations and the optical path-length concept are used to derive the astigmatism elimination and coma removal. It is shown that the astigmatism in these imaging spectrometers is eliminated by characterizing three angles, and the coma is corrected when unequal mirror radii are configured in collimating and condensing optics. The developed aberration principle is verified by comparing the performance of the astigmatism-eliminated spectrometer with the spectrometer which has neither astigmatism nor coma. Chen, Ting; Tang, Yi; Zhang, Li; Chang, Yue; Zheng, Cheng; Published by: Applied Optics Published on: 01/2014 YEAR: 2014   DOI: 10.1364/AO.53.000565 |
Auroral hemispheric power during geomagnetic storms driven by different interplanetary disturbances Although it has been a long time since the beginning of research on the auroral hemispheric power (HP), less has been done on the differences of HP among storms driven by different Chen, Xi; FU, Sui-Yan; Zheng, Ling; YANG, Li-Ping; CUI, Yan-Bo; Published by: Chinese Journal of Geophysics Published on: YEAR: 2014   DOI: 10.6038/cjg20141130 |
2013 |
Solar cycle dependence of the seasonal variation of auroral hemispheric power Although much has been done on the hemispheric asymmetry (or seasonal variations) of auroral hemispheric power (HP), the dependence of HP hemispheric asymmetry on solar cycle has not yet been studied. We have analyzed data during 1979\textendash2010 and investigated the dependence of HP hemispheric asymmetry/seasonal variation for the whole solar cycle. Here we show that (1) the hemispheric asymmetry of HP is positively correlated to the value of solar F10.7 with some time delay; (2) it is closely related to the coupling function between the solar wind and magnetosphere; and (3) the winter hemisphere receives more auroral power than the summer hemisphere for K p\~0 to 6. The statistic results can be partly understood in the framework of the ionospheric conductivity feedback model. The similarity and differences between our results and previous results are discussed in the paper. Zheng, Ling; Fu, SuiYan; Zong, QuiGang; Parks, George; Wang, Chi; Chen, Xi; Published by: Chinese Science Bulletin Published on: 02/2013 YEAR: 2013   DOI: 10.1007/s11434-012-5378-6 auroral power; coupling function; hemispheric asymmetry; precipitation; solar cycle |
Retrieving ionospheric electron density profile from FUV spectral remote sensing measurements WANG, Jing; Tang, Yi; ZHANG, Zhi-Ge; ZHENG, Xu-Li; Ni, Guo-qiang; Published by: Chinese Journal of Geophysics Published on: |
A Quality Assessment Method for Retrieved O/N\_2 Images from FUV Remote Sensing WANG, Jing; Tang, Yi; Peng, Sheng-feng; ZHENG, Xu-Li; Ni, Guo-qiang; Published by: Infrared Published on: |
2012 |
Research on Retrieving Thermospheric O/N2 from FUV Remote Sensing Magnetic storms usually cause significant departures of thermospheric O and N2\ from their normal values. To study the effects on thermospheric neutral species caused by magnetic storms, a method to retrieve thermospheric O/N2\ based on the data obtained from global ultraviolet imager on board TIMED is presented. With the help of AURIC, the normalizations of observing angles and SZAs were preformed to the measurements and a relationship between 135.6/LBHs and O/N2\ was established. Finally, applying the proposed method to retrieve O/N2\ during a magnetic period(29, September\textemdash4, October, 2002), it was shown that magnetic storms could induce significant O/N2\ depletion, extending from the polar regions towards the equator. Peng, S.; Tang, Y.; Wang, J.; Zheng, X.; Published by: Spectroscopy and Spectral Analysis Published on: 05/2012 YEAR: 2012   DOI: 10.3964/j.issn.1000-0593(2012)05-1296-05 |
2010 |
Auroral Precipitaion Models: A Potenial Future Topic for GGCM Metrics and Validation Zheng, Yihua; Kuznetsova, Masha; Rastaetter, Lutz; Hesse, Michael; Published by: Published on: |
2008 |
Interplanetary shock induced ring current auroras Zhang, Yongliang; Paxton, L.; Zheng, Yihua; Published by: Journal of Geophysical Research Published on: Jan-01-2008 YEAR: 2008   DOI: 10.1029/2007JA012554 |
The linkage between the ring current and the ionosphere system The coupling between the ring current and the ionosphere is briefly reviewed and discussed. Given global energetic neutral atom (ENA) observations of the ring current, the three-dimensional current system driven by ring current plasma pressure (the region 2 system) is derived to illustrate where the ring current connects to the ionosphere. Special attention is given to how the ring current and ionospheric conductance set up the sub-auroral polarization streams (SAPS) through the closure of the region 2 current through the ionospheric trough region. Brandt, PC; Zheng, Y; Sotirelis, TS; Oksavik, K; Rich, FJ; Published by: Midlatitude ionospheric dynamics and disturbances, edited by: Kintner, PM, Coster, AJ, Fuller-Rowell, T., Mannucci, A. J., Mendillo, M., and Heelis, R., Geophys. Monog. Series Published on: |
2007 |
Prelude to THEMIS tail conjunction study Lui, ATY; Zheng, Y; Zhang, Y; , Angelopoulos; Parks, GK; Mozer, FS; Reme, H; Kistler, LM; Dunlop, MW; Gustafsson, Georg; , others; Published by: Published on: |
2006 |
Cluster observation of plasma flow reversal in the magnetotail during a substorm Lui, ATY; Zheng, Y; Zhang, Y; Livi, S; Reme, H; Dunlop, MW; Gustafsson, Georg; Mende, SB; Mouikis, C; Kistler, LM; Published by: Published on: |
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