B. Larson, A. Koustov, D. Themens, and R. Gillies. Ionospheric electron density over Resolute Bay according to E-CHAIM model and RISR radar measurements. Advances in Space Research, January 2023 . Y. Wang, D. R. Themens, C. Wang, Y.-Z. Ma, A. Reimer, R. Varney, R. Gilies, Z.-Y. Xing, Q.-H. Zhang, and P. T. Jayachandran. Simultaneous Observations of a Polar Cap Sporadic-E Layer by Twin Incoherent Scatter Radars at Resolute. Journal of Geophysical Research: Space Physics, volume 127, issue 6, 2022 . Y. Wang, P. T. Jayachandran, D. R. Themens, A. M. McCaffrey, Q.-H. Zhang, S. David, and R. Chadwick. A Case Study of Polar Cap Sporadic-E Layer Associated with TEC Variations. Remote Sensing, volume 13, issue 7, 2021 . V. V. Forsythe, I. Azeem, G. Crowley, and D. R. Themens. Ionospheric Vertical Correlation Distances: Estimation From ISR Data, Analysis and Implications For Ionospheric Data Assimilation. Radio Science, 2020 . A. V. Koustov, S. Ullrich, P. V. Ponomarenko, R. G. Gillies, D. R. Themens, and N. Nishitani. Comparison of SuperDARN peak electron density estimates based on elevation angle measurements to ionosonde and incoherent scatter radar measurements. Earth, Planets and Space, volume 72, issue 43, 2020 . D. R. Themens, P. Jayachandran, A. M. McCaffrey, B. Reid, and R. H. Varney. A Bottomside Parameterization for the Empirical Canadian High Arctic Ionospheric Model. Radio Science, volume 54, issue 5, 2019 . C. Watson, R. B. Langley, D. R. Themens, A. W. Yau, A. D. Howarth, and P. T. Jayachandran. Enhanced Polar Outflow Probe ionospheric radio occultation measurements at high latitudes: Receiver bias estimation and comparison with ground‐based observations. Radio Science, American Geophysical Union, volume 53, 2018 . A. V. Koustov, P. V. Ponomarenko, C. J. Graf, R. G. Gillies, and D. R. Themens. Optimal F region electron density for the PolarDARN radar echo detection near the Resolute Bay zenith. Journal of Geophysical Research: Radio Science, American Geophysical Union, volume 53, 2018 . D. R. Themens, P. Jayachandran, and R. H. Varney. Examining the use of the NeQuick bottomside and topside parameterizations at high latitudes. Advances in Space Research, American Geophysical Union, volume 61, issue 1, pages 287-294, 2018 . D. R. Themens, P. T. Jayachandran, D. Bilitza, P. J. Erickson, I. Haggstrom, M. V. Lyashenko, B. Reid, R. H. Varney, and L. Pustovalova. Topside electron density representations for middle and high latitudes: A topside parameterization for E-CHAIM based on the NeQuick. Journal of Geophysical Research: Space Physics, American Geophysical Union, volume 123, 2018 . Y. Yamazaki, M. Kosch, Y. Ogawa, and D. Themens. High-latitude ion temperature climatology during the International Polar Year 2007–2008. J. Space Weather Space Clim., volume 6, 2016 . D. R. Themens, P. T. Jayachandran, and R. B. Langley. The nature of GPS differential receiver bias variability: An examination in the polar cap region. J. Geophys. Res., volume 120, pages 8155-8175, 2015 . D. Themens, P. Jayachandran, M. J. Nicolls, and J. W. MacDougall. A Top to Bottom Evaluation of IRI-2007 within the Polar Cap. J. Geophys. Res., volume 119, 2014 . D. R. Themens, P. T. Jayachandran, R. B. Langley, J. W. Macdougall, and M. J. Nicolls. Determining receiver biases in GPS-derived total electron content in the auroral oval and polar cap region using ionosonde measurements. GPS Solutions, 2012 .