July 28, 2004 Shift Report
--------------------------

	
RADIATION SUMMARY	
-----------------	
Significant solar activity: July 27 was one of the magnetic stormiest
days at earth of solar cycle 23. The solar flare activity level was
moderate. A total of 8 C and 2 M class events were recorded
yesterday. (http://www.dxlc.com/solar/)
	
CMEs reported for past two days: July 27-28: Several CMEs, at least
partial halo, could be earth directed. These could cause radiation
problems in the next couple of days. A C class event occurred today
that had a duration of ~9 hours, one of the longest we've seen.

Radiation Measurement                    Observed      Observed/Limit
---------------------                    --------      --------------
ACE 2hr fluence                           5.08e+07     1/7.1   (http://www.srl.caltech.edu/ACE/ASC/)
GOES-10/P2 4-9 MeV protons `P4GM'         5.54e-02     1/1715  (ftp://ftp2.sec.noaa.gov/pub/lists/pchan/G10pchan_5m.txt)
GOES-10/P5 40-80 MeV protons `P41GM'      8.82e-03     1/88    (ftp://ftp2.sec.noaa.gov/pub/lists/pchan/G10pchan_5m.txt)
*ACIS* Orbital fluence (since perigee)    2.82E+09     **2.8 times over limit**   (http://asc.harvard.edu/mta/alerts/current.dat)

EPHIN rates (cts/cm^2-s-sr) at last comm. OBSERVED   RADMON limit or observed/limit
----------------------------------------  --------   -----------------------------
E1300 (2.64-6.18 MeV electrons):         0.1       1/100
P4GM (5-8.3 MeV protons):                7.9       1/38
P41GM (41-53 MeV protons):               0.1       1/85
(http://cxc.harvard.edu/cgi-gen/mta/Snap/snap.cgi?action=Latest)

ACIS focal plane temperature -119.9 C, at dddZhh:mm:ss 210Z12:54:45

July 29, 2004 Shift Report
--------------------------


NOTES/ISSUES/PROBLEMS
SCS 107 ran at 210:19:24:29, due to an E1300 trip. This is presumably
due to the puffed up radiation belts. CAP 921, the contingency eclipse
load, was run but was knowingly started too late due to late schedule
of the comm start. With only about 30 minutes before eclipse, manual
commanding was done to configure for eclipse -- this was possible
because the attitude was only 17 degrees off solar normal and
therefore suitable to hold through the eclipse. Eclipse commanding was
successful, and the eclipse proceeded nominally.
Because an earth occultation was upcoming, a load was built to go into
gyro hold through the occultation and then return to normal
point. Alternately we would go into normal sun hold, which would
require some effort for recovery. The load was uplinked about 10
minutes before end of comm, and was successful.