Close Interplanetary origins of moderate ($-100$ nT $< Dst <-50$~nT) geomagnetic storms during solar cycle 23 (1996–2008),
Echer, E., B. T. Tsurutani, W. D. Gonzalez (2013),
J. Geophys. Res. Space Physics, 118 p. 385–392,
10.1029/2012JA018086.