MTA Monitoring Report 03/25/16 - 03/31/16

Archive of all weekly reports
Archive of monthly reports

Radiation

Quiet

Detrended CTI

Although we prefer to quote CTI values of the cleanest data (FT <= -119.7 C, int time > 7000sec), the data that fulfills these conditions are getting rare. We now quote CTI based on temperature corrected data for Focal plane temperature <= -118.5 C).

The unit is now CTI/year not CTI/day.

ACIS Warm Pixels

We display all bad pixels that have showed up in past, and, if any, previously unknown bad pixels appeared in the last 14 days. We also list hot pixels (defined as 1000 above the average of bias background). Warm columns 509-514 are probably due to boundaries.

New definitions of warm pixels and flickering pixels (May 15, 2014). If a pixel displays the level beyond a threshold for more than 70% of the time in the past two weeks, the pixel is categorized as a "warm" pixel. If a pixel is above the threshold more than 30% of time but less than 70% of the time in the past two weeks, the pixel is categorized as a "flickering" pixel.

ACIS Focal Plane Temperature

For this period, 5 peaks are observed.

Day (DOY)	Temp (C)	Width (Days)
085.57	-114.69	1.19
086.16	-115.00	0.53
088.03	-114.39	1.28
088.96	-115.67	0.96
090.36	-115.19	1.43

Weekly focal plane temperature with sun angle, earth angle, and altitude overplotted. Sun angle is the solar array angle, that is the angle between the sun and the optical axis (+X axis). The earth angle is the angle between earth and the ACIS radiator (+Z axis). Altitude varies from 34 kkm to 128 kkm.

SIM Movements

13 TSC moves this period

weekly average time/step	0.00124 s
mission average time/step	0.00136 s

Telemetry

New violations or new extrema are shown in blue cells.

IRUs

• Gyro Bias Drift
• Gyro Bias Drift Histogram

Recent Observations

Trending

This week's focus is EPHIN

Last reported on Jan 07.

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

Min/max envelopes in dark blue appear on the trending plots. The envelopes are 4th degree fits to the monthly minimum and maximum values for each MSID. The final polynomial form and binning are still being experimented with. We will soon add to the trending pages a report of the fits and predictions they give on future limit violations. The light blue curve is our original smoothing of all the data over 30 day moving boxcars. The green/yellow line is a linear fit to all the data; the break occurs at a limit change.

• EPHIN Temperatures and Voltages

MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
5EIOT	350.01	18.82	3.094e+00	3.521e-02	K	EIO TEMP
5EPHINT	327.69	7.96	3.739e+00	-3.716e-02	K	EPHIN TEMP
HKEBOXTEMP	332.73	8.29	3.927e+00	6.210e-01	K	EPHIN HOUSEKEEPING EBOX: TEMPERATURE (5EHSE300)
HKGHV	426.73	4.333e+02	-8.063e+01	4.628e-01		HKGHV
HKN6I	79.42	9.71	-1.687e+00	2.700e-01	AMP	HK 6 Volts Rail - Current
HKN6V	-5.97	2.551e-02	-2.380e-03	9.598e-04	V	HK -6 Volts Rail - Voltage
HKP27I	6.93	0.67	7.216e-02	-2.724e-02	AMP	HK 27 Volts Rail - Current
HKP27V	25.51	3.97	5.092e-02	6.091e-02	V	HK 27 Volts Rail - Voltage
HKP5I	42.60	3.79	3.751e-01	1.911e-01	AMP	HK 5 Volts Rail - Current
HKP5V	5.10	1.251e-02	-2.179e-03	-1.588e-04	V	HK 5 Volts Rail - Voltage
HKP6I	140.72	6.17	-1.054e+00	3.986e-01	AMP	HK 6 Volts Rail - Current
HKP6V	5.79	1.863e-02	-1.506e-03	-1.175e-03	V	HK 6 Volts Rail - Voltage
TEIO	326.68	20.57	3.533e+00	3.064e+00	K	EPHIN ELECTRONICS HOUSING TEMP
TEPHIN	333.17	6.29	1.503e+00	-5.350e-01	K	EPHIN SENSOR HOUSING TEMP

If you have any questions, please contact: swolk@head.cfa.harvard.edu