1. Present status of the recovery phase of cosmic ray 11-year modulation;Ahluwalia;Journal of Geophysical Research,1996
2. Aitchison, J., Brown, J.A.C., 1957. The Lognormal Distribution with Special Reference to its Use in Economics. Cambridge University Press, New York, 176 pp.
3. Allen, H.J., 1982. Some commonly used magnetic activity indices: their derivation, meaning and use. In: Joselyn, J. (Ed.), Proceedings of the Workshop on Satellite Drag. (also on the web site at www.ngdc.noaa.gov/stp).
4. Allen, J.H., Feynman, J., 1979. Review of selected geomagnetic activity indices. In: Donnelly, R.F. (Ed.), Solar-Terrestrial Predictions. Proceedings. Vol. 2. Working Group Reports and Reviews, pp. 385–398.
5. Spatial and temporal distributions of magnetic effects of auroral electrojets as derived from AE indices;Allen;Journal of Geophysical Research,1975