Multi-Scale Structure of Solar Wind Transients Coincident with Electron Drift-Echoes

It is well known that impulsive substorm dipolarizations on the night side produce dispersionless injections of keV particles, for which multiple drift echoes can be observed. The impact these injections have on radiation belt particles is less well understood. We present a preliminary investigation into the types of solar wind transients (i.e. coronal mass ejections (CMEs), co-rotational and/or stream interaction regions (CIRs and/or SIRs), high-speed streams (HSS), interplanetary shock events, etc.) that correlate with observations of electron drift echoes during the Van Allen Probes mission. We use data from ACE and Wind during the current solar cycle (24) to establish criteria for determining critical regions and sub-structures within these transients that correlate with observed drift echoes. This initial study is part of a more comprehensive characterization of the multi-scale structure of solar wind drivers coincident with drift echoes through different phases of the solar cycle.