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Operations CXO Status Report

Friday 8 August 2003 3.00pm EDT

During the last week the observing schedule was interrupted following a high radiation event at 4:39pm on Aug 1 that stopped the daily load and activated the science instrument safing sequence (SCS 107). The event occurred just prior to radiation belt entry and is thought to be due to a 'puffed-up' belt state caused by high levels of coronal stream activity. The loads were replanned and science was re-started at radiation belt exit on Aug 2 with 4Ks of science loss.

The 2003 summer eclipse season continued with the spacecraft exhibiting nominal power and thermal performance during eclipses on 8/1, 8/4 and 8/6. A procedure to clear a glitch counter that incremented during the 8/4 eclipse exit was run on 8/5. The counter increment is expected under certain timing conditions.

The observing schedule for next week is shown below and includes an observation of AM Herculis coordinated with RXTE.

NGC 5252 ACIS-S Aug 10 NGC 5204 X-1 ACIS-S Aug 11 SN 2002ic ACIS-S Radiation Belts HD37468 ACIS-S/HETG Aug 12 IC5267 ACIS-S Aug 13 NGC 5204 X-1 ACIS-S Aug 14 Radiation Belts AM Herculis ACIS-S/HETG Aug 15 EXO0422 ACIS-I Aug 16 RX J2217.9-5941 ACIS-S SAX J1810.8-2609 ACIS-S NGC 5204 X-1 ACIS-S Aug 17 Radiation Belts 2MASS141850+680410 ACIS-S Aug 18


All spacecraft subsystems, with the exception of the MUPS thruster A-1 under investigation, continued to operate nominally.

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