MTA Monitoring Report 11/22/02 - 11/28/02

Archive of monthly reports

Radiation

A Radiation violation of P3 (130Kev) was observed by ACE on Tue, 26 Nov 2002 at 16:15:05 (EST)
Observed = 4.1448e+08
(limit = fluence of 3.6e8 particles/cm2-ster-MeV within 2 hours)

Resulted in SCS107 manual run at 2002:331:00:00:00 UTC.
Science resumed at 2002:332:05:18:41.
Lost science time: 90.6 ksec
Obsids affected: 4408 (partial), 4073, 3829, 3855, 4407, 3074, 3565.

Other MTA Alerts Sent

Detrended CTI

CTI analysis is now computed with "detrending":
Detrend CTI = Measured CTI + S3 amplitude reject rate * Detrend factor.

Average of ACIS-I CCDs (MnKa) slope 8.881e-9 CTI/day
Detrended slope 9.000e-9 CTI/day

ACIS Warm Pixels

A new algorithm for detecting bad pixels/columns is now in place.

A bad pixel was selected as follows:

• acis*bias0.fits in a given period are obtained
• compute an average of count rates for each ccd
• compare each pixel to the average, and if a pixel value is 5 sigma higher than the average, a local average (32x32) is computed.
• if the pixel value is still 5 sigma higher than the local average, it is marked as a possible warm pixel candidate.
• if three consequtive bias frames have the same pixel marked as a warm pixel candidate, the pixel is listed as a warm pixel.
• if the pixel is located at the edge of the CCD (y = 1023, 1024), it is dropped from the list.
  
• for a hot pixel, a process is the same, except the threshold is the ccd average plus 1000 counts
  

• each column is averaged, and compared to an average for the entire ccd.
• if the average of the column is 5 sigma higher than the average of the ccd, compare the column average to a local average (10 columns).
• if the column is still 5 sigma higher than the local average, mark it as a bad column candidate
• if the column appears as a bad column for 3 consecutive frames, it is marked as a real bad column.
• the columns: 258, 514, 770 appear regularly, but these are due to boundaries of the ccds and are not reported here.

	CCD0	CCD1	CCD2	CCD3	CCD4	CCD5	CCD6	CCD7	CCD8	CCD9
New this week/ Reappeared
Previously reported - still observed						(258,797),(367,511)		(335,412)	(1024,454)
Previously reported - not observed during this period
Flickering pixels	(1024,40)					(226,565),(258,797) (263,317),(280,313) (352,544),(357,303) (367,511),(369,376) (383,586),(383,587) (607,281),(669,577) (1023,166)	(360,249)		(199,678),(335,412)	(62,482),(587,544) (1024,454),(1024,455)
Warm column candidates

ACIS Focal Plane Temperature

Day (DOY)	Temp (C)	Width (Days)
330.22	-118.09	0.53

SIM Movements

Telemetry

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 Aug 29.
Only the most interesting or representative msids are shown below. For a full listing choose the bulletted link.

• Gratings

HETG Inserted
MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
4HPOSARO	6.482e+00	3.918e-01	-2.739e-01	NaN	deg	HETG pot. angle (side A)
4HPOSBRO	6.362e+00	1.698e-01	-1.302e-01	NaN	deg	HETG pot. angle (side B)
Gratings In Motion
MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
4MP28AV	2.016e+01	1.062e+01	-9.437e+00	NaN	VDC	MCE A: +28 VOLT MONITOR
4MP28BV	6.139e+00	9.370e+00	8.182e+00	NaN	VDC	MCE B: +28 VOLT MONITOR
4MP5AV	4.647e+00	5.462e-01	-1.878e-01	NaN	VDC	MCE A: +5 VOLT MONITOR
4MP5BV	1.090e+00	1.741e+00	1.509e+00	NaN	VDC	MCE B: +5 VOLT MONITOR