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

Archive of all weekly reports

Archive of monthly reports

Radiation

Quiet

ACIS/Radiation Environment correlations

CTI Trend

Average of ACIS-I CCDs (MnKa) slope 1.142e-8 CTI/day
Detrended slope 1.106e-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.



ACIS Focal Plane Temperature

For this period, 2 peaks were observed

SIM Movements

8 TSC moves this period
weekly average time/step 0.00132 s
mission average time/step 0.00137 s

Telemetry

02/23

02/24 02/26 02/27

IRUs


Recent Observations

All data reported below are based on manual processing. "Prob" means that there was probably bad time data included in the manual runs.

OBSID DETECTOR GRATING TARGET ANALYSIS ACA
3445 ACIS-S NONE 3C294 OK OK
3092 ACIS-S NONE FTM0729+3336 OK OK
2979 ACIS-S NONE APM08279+5255 OK OK
3391 ACIS-I NONE HDF-N OK OK
2756 HRC-S NONE 3C58 PROBLEM OK
2588 HRC-I NONE VEGA OK OK

Trending

This week we report on trends in the daily maximum values .
This Week's focus GRAD.
Temperature in degrees K.
Voltage in volts.
Current in amps.

Daily averge trends last reported on Dec 13.
The most interesting trends are indicated with "*".


Radiation Zone Timing

Plotted below are radiation zone timing plots based on the following definitions of radiation zone:
RADZONE - Ephin levels (in any of the E1300,P4GM,P41GM channels) are more than 1/3 of RADMON safing thresholds.
RADMON - Radmon is disabled for radiation zone (as commanded based on OFLS model, for comparison with actual radiation levels).
SCA00 - Ephin SCA00 channel is saturated (@8372224). (data currently available only since Nov.2001)
PERIGEE - Time of closest earth approach (for comparison).