Radiation Telecon Summary and SCS107 (Sept 1, 2025 6:08 pm):
------------------------------------------------------------
A discussion of rapidly rising radiation rates was held at the beginning of
the comm
that started at 4:35PM EDT today, and it was decided to safe the science
instruments
manually during the comm.

CAP 593A was run to initiate safing, and SCS 107 began running at
approximately
244:21:09:39Z. As we are not in eclipse season, CAP 893B was run to disable
SCS 29
(Eclipse load control), and the SOP_SAFE_SAFING_ACTIONS procedure
executed.
ACIS and HRC were verified to be in a safe state.

Current plans call for recovery load development and release during the day
tomorrow,
followed by review and uplink of loads during the 8:10PM comm (Sep. 02).
Chandra will be in the radzone at that time and science observations will
start
after radzone exit at 4:43AM (Sep 03).

The team will reconvene immediately following the 9AM operations tagup
tomorrow (Sep 02 Tue) to assess the development of the radiation environment and the viability of
the return to science plan.

Update on Return to Science (Sept 2, 2025 10:01 am):
----------------------------------------------------
Immediately following the 9AM operations tagup, status was summarized and plans for return to science reviewed (see sot_yellow_alert message of 6:07 PM yesterday, Sep 01).
Radiation levels have fallen substantially and there appears to be no obstacle to implementing the return to science plan.
The load (SEP0325A) was released at 9:05PM EDT yesterday for review by noon today (Sep 02) and uplink at the 8:10PM comm today.
At that point Chandra is in the radzone; science observations will resume at radzone exit at 4:43 AM EDT on Wed (Sep 03).
We do not currently anticipate further radiation concerns with the return to science plan, but will continue observing the radiation levels and will convene a go-nogo telecon before the 8:10 PM EDT comm this evening only if needed.