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Large ionospheric disturbances during a minor geomagnetic storm on June 23, 2000
Li, Zheng; Wei, Fengsi; Feng, Xueshang; Guo, Jianpeng; Emery, Barbara A.; Zhao, Xinhua; Li, Z (reprint author), Chinese Acad Sci, SIGMA Weather Grp, State Key Lab Space Weather, CSSAR, Beijing, Peoples R China.
Department空间科学部
Source PublicationANNALS OF GEOPHYSICS
2012
Volume55Issue:2Pages:253-263
ISSN1593-5213
Language英语
AbstractWe investigate the variations in the ionosphere during a small geomagnetic storm on June 23, 2000, using the total electron content of the Jet Propulsion Laboratory global positioning system, and the ionospheric critical frequency. Large and long-lasting reductions in the daytime electron density were observed at mid-latitudes in the northern hemisphere by ionosondes. These reductions reached 30% to 40% compared to the 27-day median value. At the same time, a transformation from similar large positive storm effects to negative storm effects was observed in the northern hemisphere by the global positioning system receivers. The geomagnetic disturbance was very weak from June 23-25, 2000, as the SYM-H index was >-40 nT and ASY-H was <90 nT. Of note, during this case there were neither long-lasting southward IMF B-z nor strong positive IMF B-y components, where a large positive IMF B-y might be the main reason for ionospheric storms during minor geomagnetic disturbances [Goncharenko et al. 2006]. We confirm a 13-h enhanced energy input from the disturbed solar wind by calculation of the Borovsky, Akasofu and Newell coupling functions, the global auroral precipitation, and the Joule heating. We suggest this enhanced energy input as the main cause of these intense ionospheric storms, although the maximum of the energy input was not large. In addition, we propose that the Newell coupling function might be more suitable for reflecting the energy transfer from the disturbed solar wind to the magnetosphere under weak geomagnetic activity.; We investigate the variations in the ionosphere during a small geomagnetic storm on June 23, 2000, using the total electron content of the Jet Propulsion Laboratory global positioning system, and the ionospheric critical frequency. Large and long-lasting reductions in the daytime electron density were observed at mid-latitudes in the northern hemisphere by ionosondes. These reductions reached 30% to 40% compared to the 27-day median value. At the same time, a transformation from similar large positive storm effects to negative storm effects was observed in the northern hemisphere by the global positioning system receivers. The geomagnetic disturbance was very weak from June 23-25, 2000, as the SYM-H index was >-40 nT and ASY-H was <90 nT. Of note, during this case there were neither long-lasting southward IMF B-z nor strong positive IMF B-y components, where a large positive IMF B-y might be the main reason for ionospheric storms during minor geomagnetic disturbances [Goncharenko et al. 2006]. We confirm a 13-h enhanced energy input from the disturbed solar wind by calculation of the Borovsky, Akasofu and Newell coupling functions, the global auroral precipitation, and the Joule heating. We suggest this enhanced energy input as the main cause of these intense ionospheric storms, although the maximum of the energy input was not large. In addition, we propose that the Newell coupling function might be more suitable for reflecting the energy transfer from the disturbed solar wind to the magnetosphere under weak geomagnetic activity.
Indexed BySCI ; EI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3218
Collection空间科学部
Corresponding AuthorLi, Z (reprint author), Chinese Acad Sci, SIGMA Weather Grp, State Key Lab Space Weather, CSSAR, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Li, Zheng,Wei, Fengsi,Feng, Xueshang,et al. Large ionospheric disturbances during a minor geomagnetic storm on June 23, 2000[J]. ANNALS OF GEOPHYSICS,2012,55(2):253-263.
APA Li, Zheng.,Wei, Fengsi.,Feng, Xueshang.,Guo, Jianpeng.,Emery, Barbara A..,...&Li, Z .(2012).Large ionospheric disturbances during a minor geomagnetic storm on June 23, 2000.ANNALS OF GEOPHYSICS,55(2),253-263.
MLA Li, Zheng,et al."Large ionospheric disturbances during a minor geomagnetic storm on June 23, 2000".ANNALS OF GEOPHYSICS 55.2(2012):253-263.
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