Supersubstorms (SML < -2500 nT): Magnetic Storm and Solar Cycle Dependences

Hajra, R., B. T. Tsurutani, E. Echer, W. D. Gonzalez, and J. W. Gjerloev (2016), Supersubstorms (SML < -2500 nT): Magnetic Storm and Solar Cycle Dependences, J. Geophys. Res. Space Physics, 121, doi.org/10.1002/2015JA021835 (pdf)