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Hemispheric asymmetry of the polar ionospheric density investigated by ESR and JVD radar observations and TIEGCM simulations for the solar minimum period

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Title
Hemispheric asymmetry of the polar ionospheric density investigated by ESR and JVD radar observations and TIEGCM simulations for the solar minimum period
Other Titles
북극 EISCAT과 남극 장보고 전리권 레이더 관측 및 TIEGCM 모델 활용, 극지 전리권 전자밀도의 남북극 차이 연구
Authors
김은솔
Jee, Geonhwa
Wenbin Wang
곽영실
심자순
Ham, Young-Bae
김용하
Keywords
극지 전리권남극 장보고기지남북극 차이북극 EISCAT
Issue Date
2023
Citation
김은솔, et al. 2023. "Hemispheric asymmetry of the polar ionospheric density investigated by ESR and JVD radar observations and TIEGCM simulations for the solar minimum period". JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 128(2): 1-13.
Abstract
The ionospheric density displays hemispheric asymmetries in the polar region due to various hemispheric differences, for example, in the offset between geographic and geomagnetic poles and in the geomagnetic field strength. Using ground-based ionospheric measurements from Vertical Incidence Pulsed Ionospheric Radar with Dynasonde analysis at Jang Bogo Station (JBS), Antarctica and from EISCAT Svalbard Radar (ESR) where both sites are located mostly in the polar cap, we investigate the hemispheric differences in the ionospheric density between the northern and southern hemispheres for geomagnetically quiet and solar minimum condition. The results are also compared with Thermosphere Ionosphere Electrodynamic Global Circulation Model (TIEGCM) simulations. The observations show larger density and stronger diurnal and seasonal variations at JBS in the southern hemisphere than at Svalbard in the northern hemisphere. The diurnal variations of the density peak height are also observed to be much larger at JBS. In both hemispheres, the ionospheric density is significantly reduced in winter due to the limited solar production at high geographic latitudes, but TIEGCM considerably overestimates winter density, which is even larger than summer density, especially in the northern hemisphere. Also existed are the differences in the equinoctial asymmetry between the observations and the simulations: the daytime F-region density is observed to be larger in fall than in spring in both hemispheres, but TIEGCM shows the opposite. In general, most of the observed asymmetrical density are much weaker in the model simulation, which may result from lack of proper magnetospheric forcings and neutral dynamics in the model.
URI
https://repository.kopri.re.kr/handle/201206/14846
DOI
http://dx.doi.org/10.1029/2022JA031126
Type
Article
Station
Jang Bogo Station
Indexed
SCIE
Appears in Collections  
2023-2023, Occurrence of aurora and their correlations with polar upper atmospheric variabilities (23-23) / Jee, Geonhwa (PE23020)
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