MTA Monitoring Report 06/07/24 - 06/13/24

Archive of all weekly reports
Archive of monthly reports

Radiation

Opsgenie Alert Email: (2024/06/07):
-----------------------------------
Chandra realtime telemetry shows SCS107 DISA at 2024:160:03:05:38 UT Check email for info.

Opsgenie Radiation Telecon Summary (2024/06/08):
---------------------------------------------------
Update 8-June-11:30

At the day 160 03:00z comm (Friday night), SCS-107 was observed to have run at 160:02:29:29z (10:29 EDT). This was in response to prompt particles from an M9.7 flare from region 3697 at 01:49z. The science instruments were confirmed safe during the real-time communication pass.

An extremely high prompt proton level was observed. The peak GOES proxy was about 2,000,000 HRC shield counts. This rate is now declining exponentially and is expected to be safe for restart within 24 hours. Models indicate CME arrival on Monday before 162:14:00z. The current plan is to restart science observations with either the 162:20:30z comm pass - if AR Lac HRC observations are required - or 163:00:00z comm pass if the AR Lac observations can be delayed. The hope is that ACE p3 rates will be acceptable at those times. The team will meet after the 9 am standup Monday morning (EDT Jun 10) to review the space weather status and confirm an appropriate recovery to science timeline.

Opsgenie Radiation Discussion Summary (2024/06/10):
------------------------------------------------------

Update of 2024 Jun 10 Monday ~9:15 AM local

Following the 9AM OCC tagup a discussion of the space weather situation and of plans to return to science was conducted. GOES proxy rates are substantially below threshold and falling; ACE rates are still rising but are expected to turn over later today (as they already have at higher energies). It was decided that the situation justifies going ahead with steps to uplink JUN1124A loads at the 8PM comm this evening, and loads have been released for review by 1:30PM today.

Opsgenie Radiation Return to Science (2024/06/10):
--------------------------------------------------

Update of 2024 Jun 10 Monday ~8PM local

The team met at 7:45PM CDT to review the space weather situation and noted that ACE rates were at ~3000 and descending, and GOES proxy ~5000. With the criteria met and the concurrence of the HRC and ACIS teams, the decision was reached to go ahead with the recovery plan and uplink the JUN1124A loads for return to science. At 8PM BOT all operations were nominal.

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)
157.79	-113.73	0.85
159.82	-107.15	1.51
161.05	-114.22	0.24
161.93	-116.65	0.94
163.21	-112.52	0.33

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

9 TSC moves this period

weekly average time/step	0.00123 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 EPHIN

Last reported on Mar 28.

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

• EPHIN Temperatures and Voltages

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