MTA Monitoring Report 10/04/24 - 10/10/24

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Radiation

Shift Report Oct 09 2024 L9211

There was an X2 flare Oct 9 @1:55 UTC. There is an Earth directed CME. The GOES rates currently correspond to an HRC shield rate proxy of 2000. This may trigger TXings. The CME should arrive late Thursday night. Solar activity is expected to be moderate with a chance for X-class flares on days one and two (09 Oct, 10 Oct) and likely to be moderate with a chance for X-class flares on day three (11 Oct).

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Solar radiation event Oct 9 Update 1 (10/09/24 - 10:02 AM)

There was an X2 flare at 283:01:55 UTC (Tuesday night Oct 8). There is an Earth-directed CME. TXings was triggered 283:03:33:59 UTC. ACIS and HRC are safe. Science loads are halted. The associated CME should arrive late Thursday night. The team will gather more data throughout the day and perform cleanup activities. We will meet after the 9 am tomorrow to discuss the return to science plan.

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Solar radiation event Oct 9 Update 2 (10/10/24 - 9:29 AM)

There was a short radiation tag up at 9:05.

Current status: Science instruments are radiation-safe. ACE P3 rates 10,000 and ascending HRC proxy 1000 (with a limit of 250) and descending slowly.

Forecast: Models project CME impact within the next 12 hours with a 24-hour tail. Kp rates are expected to exceed 6 most of Friday and remain as high as 4.3 late Saturday. There is a 40% chance of an additional X-class flare in the next 72 hours.

Plan: Restart science coming out of rad. zone Saturday night around 10 pm. Loads will go out for review late today or tomorrow. We will tag up after the 9 am tomorrow with a planned go/no go Saturday night at 8:15.

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Solar radiation event Oct 9 Update 3 (10/11/24 - 9:06 AM)

There was a short radiation tag up at 9:05 on Oct 11.

Current status: Science instruments are radiation-safe. ACE P3 rates 3,000 and descending HRC proxy 40 (with a limit of 250) and descending slowly. Kp 7 CME impacted Earth yesterday at 14:15 GMT

Forecast: Kp rates are expected to exceed 6 most of Friday and remain as high as 4.3 late Saturday. Rates should be 3.3 or less on Sunday. There is a 25% chance of an additional X-class flare in the next 72 hours.

Plan: Restart science coming out of rad. zone Saturday night around 10 pm. Loads are out for review If needed there will be a go/no go Saturday night at 8:15. But this may be waived by email.

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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, 6 peaks are observed.

Day (DOY)	Temp (C)	Width (Days)
276.36	-89.61	0.83
277.14	-115.19	0.51
277.61	-108.73	0.50
278.03	-110.17	0.42
279.00	-95.39	0.81
281.20	-106.92	2.10

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

14 TSC moves this period

weekly average time/step	0.00130 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 HRMA Thermal

Last reported on Jul 25.

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

• HRMA Thermal

• HRMA Struts

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