Fast Fourier Transform

Saikin, A., Zhang, J. -C., Allen, R. C., Smith, C., Kistler, L., Spence, H., et al. (2015). The occurrence and wave properties of H + -, He + -, and O + -band EMIC waves observed by the Van Allen Probes. Journal Of Geophysical Research: Space Physics. http://doi.org/10.1002/2015JA021358 (Original work published September 2015)