SOHO is operating in normal mode again

By Keith Cowing
December 11, 1999
Filed under ,

According to NASA: “As of December 10 at 01:00 UT, the SOHO spacecraft is back in Normal Mode. Instrument recovery from safe modes is in progress. Yesterday, a momentum management, a station keeping (orbit trim), and another momentum management maneuver were performed as planned. Instrument recovery operations are expected to be finished by the end of the day, and normal science operations will be resumed tomorrow. “

“On Sunday, 1999 November 28, while in normal mode collecting routine science data, the computer for the spacecraft’s Attitude Control Unit A (ACU)
reset for an undetermined reason. This automatically triggered a switch to the Emergency Sun Reacquisition (ESR) mode. ESR is an automatic
reconfiguration of the Attitude and Orbit Control Subsystem (AOCS). During ESR, the spacecraft broadcasts low-rate engineering data only (no science
data). “

° SOHO website

° New SOHO Slide Presentation

° The Best of SOHO

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