The Polar Cap Tongue of Ionization: A survey of GPS TEC mappings from 2000 to 2014

Michael David1, Jan Josef Sojka2, Robert Walter Schunk1 and Anthea Coster3, (1)Utah State University, Logan, UT, United States, (2)Center for Atmospheric and Space Sciences, Utah State University, Physics, Logan, UT, United States, (3)MIT Haystack Observatory, Westford, MA, United States