Newell, P. T., K. Liou, J. W. Gjerloev, T. Sotirelis, S. Wing, E. J. Mitchell (2016), Substorm probabilities are best predicted from solar wind speed, J. Atmospheric and Solar-Terrestrial Physics, doi.org/10.1016/j.jastp.2016.04.019 (pdf)
Newell, P. T., K. Liou, J. W. Gjerloev, T. Sotirelis, S. Wing, E. J. Mitchell (2016), Substorm probabilities are best predicted from solar wind speed, J. Atmospheric and Solar-Terrestrial Physics, doi.org/10.1016/j.jastp.2016.04.019 (pdf)