Minghua Hong

Publications (2)2.02 Total impact

• Article: Nightside field-aligned current during the April 6, 2000 superstorm

  Yuan Wang, MingHua Hong, GengXiong Chen, WenYao Xu, AiMin Du, XuDong Zhao, XiaoCan Liu, Hao Luo
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  ABSTRACT: Using the east-west geomagnetic disturbance fields observed from stations at mid-latitudes, we investigate the characteristics of field-aligned currents on the nightside during the April 6, 2000 superstorm. The results indicate that there is an eastward disturbance on the nightside of Northern Hemisphere during the main phase of magnetic storm, while the interplanetary magnetic field (IMF) is continued southward. The positive disturbances in the postmidnight are larger than that in the premidnight. This suggests that upward field-aligned currents develop on the nightside, when the IMF is directed southward. The peak of upward field-aligned currents is located in postmidnight, and it will be more obvious at substorm expansion. We get the conclusion that both partial ring current and region-2 field-aligned current shift to dusk sector. The upward region-2 current is decreased at substorm onset, and intensified after it. We also investigate the relationship between the upward field-aligned currents on the nightside and the auroral electrojets at high latitudes. It shows a good correspondence between region-2 current and the westward electrojet in the postmidnight. We suppose that they are both associated with the convection electric field. Keywordsmain phase-field-aligned current-auroral electrojet-substorm current wedge
  Chinese Science Bulletin 04/2012; 55(20):2175-2181. · 1.32 Impact Factor
• Article: Geomagnetic responses in high latitudes during the storm of july 15—16, 2000

  Gengxiong Chen, Aimin Du, Wenyao Xu, Hongfei Chen, Minghua Hong, Fenglin Peng, Enqi Shi
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  ABSTRACT: The ionospheric equivalent currents in the high latitudes and the auroral electrojet system during the geomagnetic storm on July 15–16, 2000 are analyzed by using geomagnetic data from IMAGE chain. The large-scale vortices of equivalent currents are observed in the storm. The vortices on the dusk side of ionosphere correspond to four-celled pattern of plasma convection associated with NBZ, region I and region II field-aligned currents. Only one vortex can be found on the dawn side of ionosphere after interplanetary magnetic field (IMF) turns southward. In the initial phase of the storm, the center of eastward electrojets tends to shift equatorward. It arrives at 58.62° latitude of corrected geomagnetic coordinates (CGM). The westward electrojets are strong in the main phase. The center of westward electrojets in this period moves equatorward and may be beyond the southernmost station (56.45°) of the chain.
  Science in China Series A Mathematics 04/2012; 45:132-141. · 0.70 Impact Factor