SA41A-2321
Inter-hemispheric comparisons of the ground magnetic response to a solar wind transient: the role of ionospheric conductivity
Thursday, 17 December 2015
Poster Hall (Moscone South)
Zhonghua Xu1, Michael Hartinger1, C. Robert Clauer1, Hyomin Kim2 and Yiqun Yu3, (1)Virginia Polytechnic Institute and State University, Blacksburg, VA, United States, (2)New Jersey Institute of Technology, Center for Solar-Terrestrial Research, Edison, NJ, United States, (3)Beihang University, Beijing, China
Abstract:
We examine the ground magnetic response to a solar wind Sudden Impulse (SI) using a novel chain of magnetically conjugate magnetometers in West Greenland and the East Antarctic Plateau between 17:30-18:00UT on 2013/01/19. This chain along the 40 degree magnetic meridian allows us to investigate the latitudinal dependence of northern-southern hemisphere asymmetries in detail. Despite expectations for solstice conditions, we find remarkable agreement in the timing and amplitude of the high latitude ground magnetic response in both hemispheres. Using additional observations and simulations, we place these results in context and discuss the potential reasons for this agreement, including the role of hemispheric asymmetries in the ionospheric conductivity.
