March 23 J. McFadden UC Berkeley SSL

FAST THEMIS Substorm Events: THEMIS probe A Feb 20, 3:47 UT 3-stage dipolarization FAST Feb 20, 3:52 UT Expansion Arc

FAST THEMIS GBO: Recent Results THEMIS Ground Based Observatory Gilliam captures onset and substorm expansion AE indicates slow-growing expansion at ~3:45 UT

FAST substorm expansion during THEMIS dipolarization Feb 14, 2:45 UT Expansion Arc THEMIS Feb 14, 2:45 UT Dipolarization TH-E TH-D

FAST captures onset arc expansion Substorm expansion arc Feb 16, 4:52 UT Bob Strangeway is currently studying this FAST-THEMIS substorm conjunction.

THEMIS 2-stage dipolarization captured by TH-D & TH-E Feb 16, 4:52 UT 2-stage Dipolarization on TH-E And 2-stage diplolarization on TH-D TH-E TH-D FAST Crossing