Shuttle Exhaust Ion Turbulence Experiments (SEITE) uses space-based sensors to detect the ionospheric turbulence inferred from the radar observations from a previous Space Shuttle Orbital Maneuvering System (OMS) burn experiment using ground-based radar.Principal Investigator(s)
United States Department of Defense Space Test Program, Johnson Space Center, Houston, TX, United States
National Aeronautics and Space Administration (NASA)Sponsoring Organization
National Laboratory - Department of Defense (NL-DoD)Research Benefits
Information PendingISS Expedition Duration:
October 2008 - September 2011Expeditions Assigned
18,19/20,21/22,25/26,27/28Previous ISS Missions
SEITE will be operated on Space Shuttle missions 17A and 2JA during Expedition 19/20.
Shuttle Exhaust Ion Turbulence Experiments (SEITE) uses instrumentation on several satellites for in situ observations of density and electric field disturbances caused by the Space Shuttle Orbital Maneuvering System (OMS) engine exhaust plume. SEITE satellite instrumentation will observe and measure the plasma turbulence (disruption in ionized gas particles) produced by the OMS exhaust plume (column of gas resulting from the use of propellants and measure electric fields, plasma waves (periodic motion in ionized gas particles), plasma densities (density of electrons), and magnetic fields (an area surrounding a magnetic body or electrical current).
The Communications/Navigation Outage Forecasting System (C/NOFS) satellite, FalconSat-3, and the Enhanced Polar Outflow Probe/CASCADE Demonstrator Small-sat and Ionospheric Polar Explorer (ePOP/CASSIOPE) satellites have the correct instrumentation for the measurements. The satellite sensors for the measurements provide data on the following: Neutral Flows, Electron and Ion Distributions, Electric Fields and Plasma Waves, Radio Scintillations. The satellite needs to be within 300 km of the ignition point for the measurements. On average there is an opportunity for an observation once every 5 days for each satellite while the Shuttle is in orbit.
Artificially created plasma turbulence can disrupt military navigation and communications using radio systems.Earth Applications
Results will help in the interpretation of spacecraft plumes when they are observed from Earth.
A 10-second dual OMS engine burn at a point where the far field exhaust plume will intersect with the flight path of one of the satellites particpating with SEITE. NASA provides orbit updates for coordination with the SEITE diagnostic satellite. Knowledge of Shuttle and SEITE satellite orbits prior to a conjunction with 10 km accuracy and 1 second resolution. After the Space Shuttle burn is performed need actual ignition point with 1 km accuracy and engine attitude to 5 degrees accuracy. The satellites will only passively observe the plume and will not perform a maneuver.Operational Protocols
OMS engine burns will be performed at a precise time, location and direction so the engine plume and on-orbit satellites will achieve conjunction.