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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.

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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

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

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