1. Comparison of simultaneous magnetic disturbance at several observatories;Adams;Phil. Trans. London (A),1892
2. On the horizontal force of the Earth's magnetism;Broun;Proc. R. Soc. Edinburgh,1861
3. The fury of space storms;Burch;Scientific American,2001
4. An outline of a theory of magnetic storms;Chapman;Proc. R. Soc. London,1919
5. Earth storms: Retrospect and prospect;Chapman;J. Phys. Soc. Japan,1962