Suprathermal Ion Measurements from WIND/STICS Susan Lepri Jacob Gruesbeck The University of Michigan

SupraThermal Ion Composition Spectrometer (STICS) On the WIND spacecraft, launched in 1994 – orbit that took it in and out of the magnetosphere for the first 10 years of the mission. – Since mid 2004, WIND had been in orbit about the L1 point with other upstream monitors such as SOHO and ACE. Time of Flight Mass Spectrometer conceptually similar to SWICS (minus post-acceleration). Unique energy range, ranging from ~6 keV/e (30 keV/e) up to 230 keV/e. Observes nearly 4Pi. Links measurements from ACE SWICS (on low energy end of spectrum) to those from instruments like ACE ULEIS (on high energy end of spectrum)

All Sectors Extends from 6keV/e up to 230 keV/e Double Coincidence measurements (E/q, M/q)

Sun Sectors

Earth Sectors

Triple Coincidence Measurements Energy range: ~30 keV/e – 230 keV/e

3D Distribution Functions STICS provides 3D distribution functions;