Title: Ionosphere-Thermosphere Data Published in "Challenges to Understanding the Earth's Ionosphere and Thermosphere" Description: These data sets accompany an AGU Centennial publication "Challenges to Understanding the Earth's Ionosphere and Thermosphere" by R.A. Heelis and A. Maute. The data file tiegcm_totTgcm.s_181_12UT_GCpaper.nc is output from a thermosphere-ionosphere-electrodynamics general circulation model (TIEGCM) simulation described in the publication (DOI:10.1007/s11214-017-0330-3). The simulation is for 2009 solar minimum conditions. The ionospheric current and neutral wind in file "heelis_empirical_f130_12UT_extracted.nc" is based on a stand-alone dynamo model (described in doi:10.1002/2017JA024841) driven by the Horizontal Wind Model and ionospheric conductivities based on empirical models of the ionosphere (IRI) and the neutral atmosphere (MSIS). The calculation is for solar medium condition (F10.7=130) and DOY 181 under geomagnetic quiescent times. Metadata URL: https://gdex.ucar.edu/dataset/id/6d5c2b37-af01-4441-b7ad-bdda4895da60.html