[P-EM10] Dynamics of Magnetosphere and Ionosphere

[PEM10-05] Statistical analysis of Convection Reversal Boundaries (CRBs) using long-term ion drift observations from DMSP satellite

*Yanshi Huang¹, Dongdong Zhao¹ (1.Harbin Institute of Technology, Shenzhen)

Keywords:Convective reversal boundary, DMSP satellite, High-latitude ionosphere, Statistical analysis

A new Convection Reversal Boundary (CRB) identification method is investigated using the high-resolution data of Defense Meteorological Satellite Program (DMSP) F16 satellite from the Madrigal website, in order to accurately and effectively identify high-latitude CRBs in both two-cell and multi-cell convection pattern modes. The improved CRB identification method is applied to the ion drift velocity data observed by DMSP F16 satellite from year 2004 to 2015. A long-term statistical study is carried out on these identified CRBs. During the 12 years analyzed in this study, a total of 17,246 CRBs are found, among which majority of them are in the summer and fall seasons during the ascending phase of solar activity. The results demonstrate that the latitudinal distributions of the CRBs in both hemispheres are generally consistent. It is also found that with the enhancement of the solar wind dynamic pressure, the energy coupling function, and the geomagnetic activity, CRBs tend to move more equatorward. With the increasing energy coupling function, the radius of the open magnetic field line region defined by CRBs saturates at about 20° magnetic latitude.