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STEREO Mission Operations and Management Overview

This document outlines the operational status and management structure of the STEREO (Solar Terrestrial Relations Observatory) mission. The mission operations began automated unattended tracks on April 30, 2007, utilizing a team of six full-time staff and collecting approximately 4-5 Gbits of data per day. Key changes include a switch to the CCSDS SLE telemetry standard in July 2011 and the use of ESA stations starting January 2012. The mission also highlights multiple instrument calibration events and the engineering challenges faced due to aging spacecraft and ground systems.

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STEREO Mission Operations and Management Overview

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  1. STEREO Project Ron Denissen – APL Project Manager Dan Wilson– APL Mission System Engineer

  2. STEREO Phase E Organization Chart Mission Director D. Quinn Mission System Engineer Josephine San Project Scientist J. Gurman Project Manager R. A. Denissen Science Teams SSC W. Thompson Payload Operations Teams System Engineering D. Wilson Mission Operations D. Ossing Subsystem Lead Engineers Mission Operation Team DSN Technical GSFC APL FDF DSN Scheduling JPL NRL, UCBerkeley, UNH, UMinn

  3. Program Status • Operations • Began automated unattended tracks April 30,2007 • Operations team is 6 full time staff. Total manpower is approximately 11 MM/M • Downlink rates: Varies, 720 to 160 Kbps depends on antenna size and track elevation • Switched MOC to CCSDS SLE telemetry standard in July 2011 • Began using ESA stations (35 meter) in January 2012 • Due to very high DSN loading • Approved through December 2012 • Mission operations center still collecting 4 – 5 Gbits per day in support of the science mission. • Special Observatory Events • Spacecraft are 230 degrees apart • >110 instrument calibration events and roll events • 30 High Gain Antenna Calibrations (every 6 months) • 84 Momentum Dumps (~every 6 weeks on both spacecraft)

  4. DSN Interface Changes 2011 • Jan - DSN Service Scheduling Software Implementation • May - SLE TLM Implementation • Jun - 160 kbps Rate Change – AHEAD (both S/C, 8 hr tracks) • Jul - 160 kbps Rate Change – BEHIND 2012 • Nov - 120 kbps Rate Change – BEHIND 2013 • May - 120 kbps Rate Change – AHEAD

  5. Issues and Concerns • ST anomalies on both spacecraft. • Last occurrence, April 10, 2011, on AHEAD • Increasing track lengthscause more data gaps. • Aging spacecraft and ground system • Wheel noise • Blanket deterioration • Ground system replacements • APL current contract expires in September of 2012. Two options exist • 1 year proposal to align with science authorization from Senior advisory Board • 2 year proposal as we have been doing.

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