SA31C-2355
Poynting flux distribution in the dayside polar cap boundary regions
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Cheng Sheng1, Yue Deng2, Yi-Jiun Su3, Marc R Hairston4, Delores Knipp5, Cheryl Y Huang3, Daniel M Ober6, Robert J Redmon7, William Robin Coley8, Quanqi Shi9 and Xiaochen Guo9, (1)University of Texas at Arlington, Physics, Arlington, TX, United States, (2)University of Texas at Arlington, Arlington, TX, United States, (3)Air Force Research Laboratory Albuquerque, Albuquerque, NM, United States, (4)University of Texas at Dallas, Richardson, TX, United States, (5)University of Colorado at Boulder, Boulder, CO, United States, (6)Air Force Research Laboratory, Kirtland AFB, NM, United States, (7)National Centers for Environmental Information, Boulder, CO, United States, (8)University of Texas at Dallas, Dallas, TX, United States, (9)Shandong University at Weihai, Weihai, China
Abstract:
DMSP spacecraft have observed signatures of enhanced electromagnetic (Poynting flux) and particle kinetic (soft electron precipitation) energy deposition in the polar cap boundary regions, including the cusp. With strict criteria of region identification using the particle data, a survey of Poynting flux in different dayside polar cap boundary regions has been performed, with a focus on whether the Poynting flux enhancement happens and when it happens in different regions. Meanwhile, a statistical study of the Poynting flux in the mid-altitude cusp (~ several Re) as measured by the Cluster spacecraft has been conducted. The conjugated measurements of Poynting flux and particle precipitation in the cusp region at the two different altitudes (DMSP, Cluster) have been compared. The result will help to explain the correlations between the two different energy forms as reported in our previous study [Sheng et al., 2014], and hence improve our understanding of the magnetosphere-ionosphere coupling, especially in the cusp region.
