azimuthal wave number

Hao, Y., Zhao, X., Zong, Q. -G., Zhou, X. -Z., Rankin, R., Chen, X., et al. (2020). Simultaneous Observations of Localized and Global Drift Resonance. Geophysical Research Letters, 47, e2020GL088019. http://doi.org/https://doi.org/10.1029/2020GL088019 (Original work published May 2020)
Murphy, K., Inglis, A., Sibeck, D., Rae, J., Watt, C., Silveira, M., et al. (2018). Determining the mode, frequency, and azimuthal wave number of ULF waves during a HSS and moderate geomagnetic storm. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1029/2017JA024877 (Original work published May 2018)