Spatial Distribution Variations of Ionospheric Electron Density Based on COSMIC Data
-
摘要: 天基GPS探测可以提供分布全球、高精度、高垂直分辨率的电离层观测资料, 弥补地基GPS探测受地域限制、垂直分辨率低的问题.利用COSMIC掩星2008—2011年数据，网格化统计分析了太阳活动处于不同水平下的电子密度空间分布变化，以期为分析电离层电子密度的空间扰动变化提供参考背景.研究表明，电子密度存在明显赤道异常和威德尔海异常现象，并发现随太阳活动性增强，在250~350 km高度范围电子密度赤道异常现象扩展到中纬地区，在300~500 km高度范围威德尔海异常现象不仅发生在南半球夏季，春秋季电子密度夜间值比白天也显著增强；在250~500 km高度范围，电子密度存在明显的威德尔海异常现象，并随着太阳活动性增强，异常区域地理范围扩宽.Abstract: Space-based GPS detection can provide the global distribution, high accuracy, high vertical resolution of the ionosphere observation data, compensate for the problem of regional restriction and low vertical resolution in ground-based GPS detection. To enrich the relevant research, this study analyses the spatial distribution variation of electron density based on COSMIC occultation data from 2008—2011 by statistical method. Results show that electron density is dominated by the EIA and WSA. With the solar activity enhancement, EIA extends into the middle latitudes from 250 km to 350 km height range, and WSA occurs not only in summer of the southern hemisphere, but also in spring and autumn there while electron density values during night time are greater than those during daytime from 300 km to 500 km height range; The electron density has obvious WSA phenomenon from 250 km to 500 km height range. And with the solar activity enhancement, the geographic range of abnormal regional expands.
-
Key words:
- geophysics /
- ionosphere /
- electron density /
- EAI /
- WSA
-
图 2 太阳活动低年和高年300~350 km高度范围Ne白天 (LT12-15) 和夜间 (LT00-03) 年变化
左侧为太阳活动低年，右侧为太阳活动高年
Fig. 2. The annual variation of electron density in the daytime and nighttime during the low and high solar activity levels from 300~350 km height range
图 3 太阳活动低年和高年300~350 km高度范围Ne (电子密度) 白天 (LT12-15) 地磁季节变化
左侧为太阳活动低年，右侧为太阳活动高年
Fig. 3. The seasonal variation of electron density in the daytime during low and high solar activity levels from 300~350 km height range
图 4 太阳活动低年和高年300~350 km高度范围Ne (电子密度) 夜间 (LT00-03) 地磁季节变化
左侧为太阳活动低年，右侧为太阳活动高年
Fig. 4. The seasonal variation of electron density in the nighttime during low and high solar activity levels from 300~350 km height rang
图 5 太阳活动低年200~500 km高度范围，50 km间隔Ne (电子密度) 夜间 (LT00-03) 变化
Fig. 5. The variation of electron density in the nighttime during low solar activity level from 200 km to 500 km height range
-
Burns, A.G., Solomon, S.C., Wang, W., et al., 2011.The Summer Evening Anomaly and Conjugate Effects.Journal of Geophysical Research:Space Physics, 116(A1):A01311, doi: 10.1029/2010JA015648 Burns, A.G., Solomon, S.C., Wang, W., et al., 2012.Daytime Climatology of Ionospheric NmF2 and HmF2 from COSMIC Data.Journal of Geophysical Research:Space Physics, 117(A9):667-672.doi: 10.1029/2012ja017529 Burns, A.G., Zeng, Z., Wang, W., et al., 2008.Behavior of the F2 Peak Ionosphere over the South Pacific at Dusk during Quiet Summer Conditions from COSMIC Data.Journal of Geophysical Research:Space Physics, 113(A12):2036-2044.doi: 10.1029/2008ja013308 Guo, P., Hong, Z.J., Zhang, D.H., 2002.COSMIC Project.Progress in Astronomy, 22(4):324-336(in Chinese with English abstract). https://www.researchgate.net/publication/252975664_COSMIC_project Jee, G., Burns, A.G., Kim, Y.H., et al., 2009.Seasonal and Solar Activity Variations of the Weddell Sea Anomaly Observed in the TOPEX Total Electron Content Measurements.Journal of Geophysical Research:Space Physics, 114(A4):A04307.doi: 10.1029/2008ja013801 Li, L.Y., Yang, Y.J., Cao, J.B., et al., 2011.Statisical Backgrounds of Topside-Ionospheric Electron Density and Temperature and Variations during Geomagnetic Activity.Chinese Journal of Geophysics, 54(10):2437-2444(in Chinese with English abstract). http://manu39.magtech.com.cn/Geophy/EN/abstract/abstract8184.shtml Lin, C.H., Liu, C.H., Liu, J.Y., et al., 2010.Midlatitude Summer Nighttime Anomaly of the Ionospheric Electron Density Observed by FORMOSAT-3/COSMIC.Journal of Geophysical Research:Space Physics, 115(A3):1-11.doi: 10.1029/2009ja014084 Lin, C.H., Liu, J.Y., Cheng, C.Z., et al., 2009.Three-Dimensional Ionospheric Electron Density Structure of the Weddell Sea Anomaly.Journal of Geophysical Research:Space Physics, 114(A2):A02312.doi: 10.1029/2008ja013455 Liu, L.B., Zhao, B.Q., Wan, W.X., et al., 2009.Seasonal Variations of the Ionospheric Electron Densities Retrieved from Constellation Observing System for Meteorology, Ionosphere, and Climate Mission Radio Occultation Measurements.Journal of Geophysical Research:Space Physics, 114(A2):A02302.doi: 10.1029/2008ja013819 Ma, X.X., 2015.Study on the Distribution Characteristics and Seismic Response of Ionosphere Using COSMIC Occultation Data.Recent Developments in World Seismology, (4):47-48 (in Chinese with English abstract). Ma, X.X., Lin, Z., Chen, H.R., 2014.Analysis on Ionospheric Perturbation of TEC and NmF2 Based on GPS and COSMIC Data before and after the Wenchuan Earthquake.Chinese Journal of Geophysics, 57(8):2415-2422(in Chinese with English abstract). http://en.cnki.com.cn/Article_en/CJFDTOTAL-DQWX201408003.htm Rishbeth, H., 1998.How the Thermospheric Circulation Affects the Ionospheric F2-Layer.Journal of Atmospheric and Solar-Terrestrial Physics, 60(14):1385-1402.doi: 10.1016/s1364-6826(98)00062-5 Tulasi, R.S., Su, S.Y., Liu, C.H., 2009.FORMOSAT-3/COSMIC Observations of Seasonal and Longitudinal Variations of Equatorial Ionization Anomaly and Its Interhemispheric Asymmetry during the Solar Minimum Period.Journal of Geophysical Research:Space Physics, 114(A6):272-276.doi: 10.1029/2008ja013880 Yu, T., Wan, W.X., Liu, L.B., et al., 2006.Using IGS Data to Analysis the Global TEC Annual and Semiannual Variation.Chinese Journal of Geophysics, 49(4):943-949(in Chinese with English abstract). http://manu39.magtech.com.cn/Geophy/EN/abstract/abstract21.shtml 郭鹏, 洪振杰, 张大海, 2002.COSMIC计划.天文学进展, 22(4): 324-336. http://www.cnki.com.cn/Article/CJFDTOTAL-TWJZ200204003.htm 李柳元, 杨英俊, 曹晋滨, 等, 2011.顶部电离层电子密度和温度的统计背景及其地磁活动的变化.地球物理学报, 54(10): 2437-2444. http://www.cnki.com.cn/Article/CJFDTOTAL-DQWX201110002.htm 马新欣, 2015.基于COSMIC掩星数据的电离层分布特征及地震响应研究.国际地震动态, (4): 47-48. http://www.cnki.com.cn/Article/CJFDTOTAL-GJZT201503011.htm 马新欣, 林湛, 陈化然, 等, 2014.基于GPS和COSMIC数据分析汶川地震TEC和NmF2扰动.地球物理学报, 57(8): 2415-2422. http://www.cnki.com.cn/Article/CJFDTOTAL-DQWX201408003.htm 余涛, 万卫星, 刘立波, 等, 2006.利用IGS数据分析全球TEC的周年和半年变化特性.地球物理学报, 49(4): 943-949. http://www.cnki.com.cn/Article/CJFDTOTAL-DQWX200604002.htm -
下载:
点击查看大图
计量
- 文章访问数: 6325
- HTML全文浏览量: 2097
- PDF下载量: 70
- 被引次数: 0
