MTA Monitoring Report 10/25/24 - 10/31/24

Archive of all weekly reports
Archive of monthly reports

Radiation

Oct 28 2024: SCS107, TXings due to high radiation
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The ACE P3 and HRX GOES proxy rates are high due to a combined effect of two CMEs which passed Earth over the weekend. The second CME arrived before midnight night and since then the ACE P3 rates have been slowly decreasing (currently at ~100,000). The HRC GOES proxy rate has been topping over the last 24 hours and it is currently at ~150,000, and expected to start decaying as well. No other CMEs are expected in the next 24 hours. Solar activity is expected to be moderate with a 30% chance for X-class flares on days one, two, and three (28 Oct, 29 Oct, 30 Oct).

Oct 29 2024:
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The ACE P3 and GOES rates are still high and slowly decreasing. ACE P3 rates are currently at ~33,000. The HRC GOES Proxy is at ~60,000, comparable with the HRC shield trip limit. No CMEs expected in the next few days. Solar activity is expected to be moderate with a 30% chance for X-class flares on days one, two, and three (29 Oct, 30 Oct, 31 Oct).

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)
298.14	-109.19	1.37
300.16	-93.48	2.76
301.99	-112.95	0.40
302.55	-110.81	0.55
302.81	-105.59	0.46

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

10 TSC moves this period

weekly average time/step	0.00133 s
mission average time/step	0.00132 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 HRC

Last reported on Aug 15.

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

• HRC Thermal

• HRC Housekeeping

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