TY - RPRT TI - Superposed epoch analysis and storm statistics from 25 years of the global geomagnetic disturbance index, USGS-Dst AU - J.L. Gannon PY - 2012 DO - 10.3133/ofr20121167 UR - https://pubs.usgs.gov/publication/ofr20121167 ID - ofr20121167 ER -