Direct Observations of the Evolution of Polar Cap Ionization Patches
添加于 2013/4/1 11:11:32 28978次阅读 | 0次推荐 | 3个评论
Patches of ionization are common in the polar ionosphere, where their motion and associated density gradients give variabledisturbances to high-frequency (HF) radio communications, over-the-horizon radar location errors, and disruption and errorsto satellite navigation and communication. Their formation and evolution are poorly understood, particularly under disturbedspace weather conditions. We report direct observations of the full evolution of patches during a geomagnetic storm, includingformation, polar cap entry, transpolar evolution, polar cap exit, and sunward return flow. Our observations show that modulationof nightside reconnection in the substorm cycle of the magnetosphere helps form the gaps between patches where steady convectionwould give a “tongue” of ionization (TOI).
Qing-He Zhang1,*, Bei-Chen Zhang1, Michael Lockwood2, Hong-Qiao Hu1, Jøran Moen3, J. Michael Ruohoniemi4, Evan G. Thomas4, Shun-Rong Zhang5, Hui-Gen Yang1, Rui-Yuan Liu1, Kathryn A. McWilliams6,2, Joseph B. H. Baker4
03/29/2013 第339卷 第6127期 1597~1600页
地球科学 » 地理学 » 自然地理学