MTA Monitoring Report 04/19/02 - 04/25/02

Archive of monthly reports

Radiation

Last week the observing schedule was halted twice due to high radiation associated with solar flare activity. The loads were halted on Apr 19 at 10:15am EDT through a ground command to execute the SI Safing SCS 107. This ensured that the accumulated radiation dose for ACIS remained below the allowed threshold. Loads were restarted at 1:43pm EDT on Apr 20.

The second interruption occurred on Apr 21 at 12:52am EDT from an autonomous trip of the radiation monitor and execution of SCS 107. In both cases, all spacecraft actions completed nominally. Observations were resumed following the second interruption at 5.30pm on Apr 23. A total of 228Ks of science was lost due to the two events, and the impacted targets will be rescheduled in a future load.

Detrended CTI

CTI analysis is now computed with "detrending" derived from reject counters for all imaging CCDs

Average of ACIS-I CCDs (MnKa) slope 1.100e-8 CTI/day
Detrended slope 1.034e-8 CTI/day

ACIS Warm Pixels

The following pixels consistently showed a bias level more than 5 sigma away the chip's mean level during this period.
We suspect some of the recurring bad pixels may be due to biases which are taken just after perigee, when the focal plane is somewhat warm. For more information see the link above and MTA monthly reports.

	CCD0	CCD2	CCD3	CCD4	CCD5	CCD6	CCD7	CCD8	CCD9
New this week/ Reappeared
Previously reported - still observed	(995,200)	(483,816)	(811,637)	(227,467)	(1-3,775-1024) (226,565) (232-245,313) (509,spurious rows) (510-511,775-1024) (512,775) (513,776-1024) (514,786) (514,850) (514,871) (514,940) (514,780)(514,783) (514,798-799)(514,803) (514,806-807)(514,818) (514,828) (515,1) (515,2) (607,281) (1022,4) (1022,166)	(360,249) (766,501)	(1-3,1-114) (1-3,775-1024) (4,spurious rows) (509,spurious rows) (510-511,775-1024) (512,775) (513-515,775-1024) (516,spurious rows) (1021,1) (1021,198) (1021,408) (1021,531) (1021,546) (1021,610) (1021,684) (1022,775)	(62,482) (587,544) (952,1)	(150,373)
Previously reported - not observed during this period

ACIS Focal Plane Temperature

Day (DOY)	Temp (C)	Width (Days)
110.94	-114.70	0.36
113.57	-114.05	0.40

SIM Movements

Telemetry

1DPICACU (DPA INPUT CURRENT A): yellow warning. Min: 0.39 (lower yellow limit: 0.9)
1DPICBCU (DPA INPUT CURRENT B): yellow warning. Min: 0.25 (lower yellow limit: 0.7)
1DPPWRA (DPA POWER A): yellow warning. Min: 11.80 (lower yellow limit: 23.4)
1DPPWRB (DPA POWER B): yellow warning. Min: 7.49 (lower yellow limit: 18.2)

1CRAT (COLD RADIATOR TEMP. A): yellow warning. Max: 152.40 (upper yellow limit: 148.16)
1CRBT (COLD RADIATOR TEMP. B): yellow warning. Max: 152.40 (upper yellow limit: 148.16)
1DPICACU (DPA INPUT CURRENT A): yellow warning. Min: 0.40 (lower yellow limit: 0.9)
1DPICBCU (DPA INPUT CURRENT B): yellow warning. Min: 0.26 (lower yellow limit: 0.7)
1DPPWRA (DPA POWER A): yellow warning. Min: 11.93 (lower yellow limit: 23.4)
1DPPWRB (DPA POWER B): yellow warning. Min: 7.72 (lower yellow limit: 18.2)

1DPICACU (DPA INPUT CURRENT A): yellow warning. Min: 0.40 (lower yellow limit: 0.9)
1DPICBCU (DPA INPUT CURRENT B): yellow warning. Min: 0.26 (lower yellow limit: 0.7)
1DPPWRA (DPA POWER A): yellow warning. Min: 11.88 (lower yellow limit: 23.4)
1DPPWRB (DPA POWER B): yellow warning. Min: 7.52 (lower yellow limit: 18.2)

1DPICACU (DPA INPUT CURRENT A): yellow warning. Min: 0.40 (lower yellow limit: 0.9)
1DPICBCU (DPA INPUT CURRENT B): yellow warning. Min: 0.26 (lower yellow limit: 0.7)
1DPPWRA (DPA POWER A): yellow warning. Min: 11.93 (lower yellow limit: 23.4)
1DPPWRB (DPA POWER B): yellow warning. Min: 7.72 (lower yellow limit: 18.2)

1CRAT (COLD RADIATOR TEMP. A): yellow warning. Max: 152.40 (upper yellow limit: 148.16)
1CRBT (COLD RADIATOR TEMP. B): yellow warning. Max: 152.40 (upper yellow limit: 148.16)
1DPICACU (DPA INPUT CURRENT A): yellow warning. Min: 0.40 (lower yellow limit: 0.9)
1DPICBCU (DPA INPUT CURRENT B): yellow warning. Min: 0.26 (lower yellow limit: 0.7)
1DPPWRA (DPA POWER A): yellow warning. Min: 11.93 (lower yellow limit: 23.4)
1DPPWRB (DPA POWER B): yellow warning. Min: 7.72 (lower yellow limit: 18.2)
HETG Insertion

1DPICBCU (DPA INPUT CURRENT B): yellow warning. Min: 0.26 (lower yellow limit: 0.7)
HETG Retraction

HKBBIASLEAKI (HK B bias leakage current): yellow warning. Max: 0.5 (upper yellow limit: 0.5)
OOBTHR56 (RT 158: TFTE AFT CYLINDER): yellow warning. Max: 288.65 (upper yellow limit: 288.6)

IRUs

• Gyro Bias Drift
• Gyro Bias Drift Histogram

Recent Observations

"Prob" means that there was probably bad time data included in the manual runs. This will be corrected in future processing.

Trending

Trends last reported on Jan 31.

• HRMA gradients

Computed HRMA Gradients
MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
AFTBLKHDT	2.836e+02	5.497e-01	7.659e-02	-4.533e-01	K	AFT BULKHEAD TEMP
FWBLKHDT	2.835e+02	8.359e-02	6.221e-02	0.000e+00	K	FORWARD BULKHEAD TEMP
HRMAAVG	3.050e+02	4.547e+00	-5.488e+00	1.957e+00	K	AVG OF HRMA METRICS
HRMACAV	2.941e+02	4.556e-03	1.594e-04	0.000e+00	K	HRMA CAVITY AVG TEMP
HRMARADGRD	-6.283e-02	4.509e-03	-3.152e-03	0.000e+00	K	HRMA RADIAL GRAD
HRMARANGE	3.058e+00	1.327e-02	1.603e-01	0.000e+00	K	HRMA TOTAL TEMP RANGE
HRMASTRUTRNGE	4.160e+00	1.747e-01	3.088e+00	-6.703e-03	K	HRMA STRUT TEMP
HRMAXGRD	9.895e-02	3.069e-03	7.621e-04	0.000e+00	K	HRMA AXIAL GRAD
MZOBACONE	2.845e+02	4.289e-01	1.413e-01	-7.514e-01	K	-Z SIDE OBA CONE
OBAAVG	2.837e+02	9.675e-02	4.781e-02	0.000e+00	K	OBA/TFTE TEMP
OBAAXGRD	-4.225e-02	5.618e-01	-1.059e-02	-8.890e-02	K	OBA AXIAL GRAD
OBACONEAVG	2.838e+02	1.126e-01	4.538e-02	0.000e+00	K	OBA CONE AVG TEMP
OBADIAGRAD	1.567e+00	4.320e-01	-1.039e+00	-8.690e+00	K	OBA DIAM GRAD
PZOBACONE	2.830e+02	2.434e-02	3.614e-03	0.000e+00	K	+Z SIDE OBA CONE
SCSTRUTRNGE	1.896e+00	8.059e-01	1.054e+01	-2.628e-02	K	SC STRUT TEMP
TFTERANGE	2.673e+01	1.638e-01	-1.509e+00	0.000e+00	K	TFTE VENT/RAD TEMP

• ACIS Electronics
• ACIS Thermal
• Ephin Key Rates L1
• SIM Thermal Side A/B