TY - JOUR A1 - Tsurutani, B. T. A1 - Hajra, R. A1 - Echer, E. A1 - Gjerloev, J. W. T1 - Extremely intense (SML ≤–2500 nT) substorms: isolated events that are externally triggered? JO - Ann. Geophys. J1 - ANGEO VL - 33 IS - 5 SP - 519 EP - 524 Y1 - 2015/05/06 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/33/519/2015/ L1 - https://angeo.copernicus.org/articles/33/519/2015/angeo-33-519-2015.pdf DO - 10.5194/angeo-33-519-2015 ER -