C. C. Triplett, J. Li, R. L. Collins, G. A. Lehmacher, A. Barjatya, D. C. Fritts, B. Strelnikov, F.-J. Luebken, B. Thurairajah, V. L. Harvey, D. L. Hampton, and R. H. Varney. Observations of Reduced Turbulence and Wave Activity in the Arctic Middle Atmosphere Following the January 2015 Sudden Stratospheric Warming. Journal of Geophysical Research: Atmospheres, American Geophysical Union, volume 123, 2018 . M. J. Nicolls, D. C. Fritts, D. Janches, and C. J. Heinselman. Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar. Ann. Geophys., volume 30, issue 6, pages 945-962, 2012 . D. Janches, D. C. Fritts, M. J. Nicolls, and C. J. Heinselman. Observations of D-region structure and atmospheric tides with PFISR during active aurora. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 688-696, 2009 . D. Pancheva, P. Mukhtarov, N. J. Mitchell, B. Andonov, E. Merzlyakov, W. Singer, Y. Murayama, S. Kawamura, J. Xiong, W. Wan, W. Hocking, D. Fritts, D. Riggin, C. Meek, and A. Manson. Latitudinal wave coupling of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004. Ann. Geophys., volume 26, issue 3, pages 467-483, 2008 . Y. Portnyagin, T. Solovjova, E. Merzlyakov, J. Forbes, S. Palo, D. Ortland, W. Hocking, J. Macdougall, T. Thayaparan, A. Manson, C. Meek, P. Hoffmann, W. Singer, N. Mitchell, D. Pancheva, K. Igarashi, Y. Murayama, C. Jacobi, D. Kuerschner, A. Fahrutdinova, D. Korotyshkin, R. Clark, M. Taylor, S. Franke, D. Fritts, T. Tsuda, T. Nakamura, S. Gurubaran, R. Rajaram, R. Vincent, S. Kovalam, P. Batista, G. Poole, S. Malinga, G. Fraser, D. Murphy, D. Riggin, T. Aso, and M. Tsutsumi. Mesosphere/lower thermosphere prevailing wind model. Adv. Space Res., volume 34, issue 8, pages 1755-1762, 2004 .