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Auroral activity index AE, and its universal time variations (http://wdc.kugi.kyoto-u.ac.jp/aedir/) T. N. Davis and M. Sugiura https://doi.org/10.1029/JZ071i003p00785

The upgraded CARISMA magnetometer array in the THEMIS era (http://www.carisma.ca/) I. R. Mann, D. K. Milling, I. J. Rae, L. G. Ozeke, A. Kale, Z. C. Kale, K. R. Murphy, A. Parent, M. Usanova, D. M. Pahud, E.-A. Lee, V. Amalraj, D. D. Wallis, V. Angelopoulos, K.-H. Glassmeier, C. T. Russell, H.-U. Auster, and H. J. Singer https://doi.org/10.1007/s11214-008-9457-6

Drift motions of small-scale irregularities in the high-latitude F region: An experimental comparison with plasma drift motions (http://superdarn.jhuapl.edu/) J. M. Ruohoniemi, R. A. Greenwald, K. B. Baker, J. P. Villain, and M. A. McCready https://doi.org/10.1029/JA092iA05p04553

The Advanced Composition Explore (https://cdaweb.gsfc.nasa.gov/sp_phys/) E. C. Stone, A. M. Frandsen, R. A. Mewaldt, E. R. Christian, D. Margolies, J. F. Ormes, and F. Snow https://doi.org/10.1023/A:1005082526237