Email from Jan 27, 2012
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Solar energetic particle event forecasted at the orbit of SOHO starting at 2012-01-27 19:00Z.
The flux of one or more of the > 15.8 MeV proton channels is expected to exceed 10^(-1)
pfu/MeV within next few hours.
The spacecraft at the orbits of Messenger and Stereo A and near-Earth orbits can be impacted.
The SEP event is related to the X1.8 flare detected by GOES and peaked at about
2012-01-27T18:37Z (see Space Weather Alert 20120127-AL-001) .
Telecom Summary Jan 27, 2012
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A GOES-based alert prompted a telecon to discuss the radiation environment. GOES rates
indicated a likely RadMon trip due to the HRC antico shield rate. Comm was established
early and indeed SCS-107 had run.
There was a nominal SCS-107 run at 2012:027:19:39:14z. SIs are safe and all OBC error-log
entries were expected. There were no limit-monitoring deviations. As a clean-up item SCS-29
will be disabled via pre-approved CAP (893A). Additionally, CAP 675A needs to be run
at the time of replan load uplink.
The ACE flux is not particularly high at the moment and there isn't a clearly Earth-directed
CME so they may not rise substantially.
Our recovery plan is to attempt to resume science at the next radiation zone exit
(~028:22:20:02z). The uplink would be during the comm that starts at 028:21:05:00z
(4:05pm EST), using GORS rates as the surrogates for the HRC antico shield and EPHIN E1300 rates.
The replan loads would contain the remainder of the JAN2612 and all of the JAN3012 schedules.
The plan is work this evening on building the products and to have a load review at noon
tomorrow; the actual time will be announce via email. Following the load review a discussion
of the radiation environment, likelihood of the planned resumption , and discussion of a plan B
will occur.
Telecom Summary Jan 28, 2012
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The radiation environment does not look feasible for a resumption at the 028/2105-2205z comm pass.
Since another version of the JAN2812 resumption schedule would be required we have decided
to abort the attempt to resume at that pass and apply resources to developing a plan for a later
resuption.
The Go/No-Go telecon for 4pm EST is cancelled.
A "Plan B" resumption schedule has science resuming after the 030/0100-0200z comm pass, with
the remainder of the JAN2612 and all of the JAN3012 schedules. Loads will be worked during
the day today and a review is planned for noon tomorrow.
CAP 1189B to check the HRC antico shield rates and a CAP to collect ACIS CTI data are planned
to be executed during the 029/2120-2220z comm pass (4:20-5:20pm EST). CAP 675A will be executed
prior to uplink the replan loads.
From Jan 30, 2012 SOT report
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On Friday afternoon the GOES-based alert prompted a telecon to discuss the
radiation environment.
GOES rates indicated a likely RadMon trip due to the HRC antico shield rate.
Comm was established early and indeed SCS-107 had run.
After radiation subsided, the replan loads restarted science at 2012:030:02:20.
Running JAN3012C. Obsid 13717 30 ks ACIS-S/HETG 4U1630-47, Testing the Wind-Jet
Connection in a Black Hole Transient.
Loads good through: 2012:036:13:57.
UTC 2012:030:14:05:03 (Jan30) f_ACE 9.56e+03 F_CRM 6.19e+07 Kp 3.3 R km 137804D
Currently scheduled FPSI, OTG : ACIS-S HETG
Estimated Kp : 3.33
ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 9.56e+03
GOES-15 P2 flux, in RADMON P4GM units : 18.05
GOES-13 P2 flux, in RADMON P4GM units : 22.31
GOES-15 P5 flux, in RADMON P41GM units : 0.67
GOES-13 P5 flux, in RADMON P41GM units : 0.71
GOES-13 E > 2.0 MeV flux (p/cm^2-s-sr) : 679.0
Orbit Start Time : 2012:028:18:49:03
Geocentric Distance (km), Orbit Leg : 137845 D
CRM Region : 3 (Magnetosphere)
External Proton Flux (p/cm^2-s-sr-MeV) : 4.9608e+03
Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 9.9215e+02
External Proton Orbital Fluence (p/cm^2-sr-MeV) : 9.7471e+08
Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 6.1880e+07
From Cahndra X-ray Observatory Report (Feb 03, 2012)
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During the last week the observing schedule was interrupted by a
high-radiation event that activated the science instrument safing
sequence (SCS 107) and stopped observing at 02:39pm EST on Jan 27. All
spacecraft actions were nominal. A real-time procedure was executed on
Jan 27 to disable SCS-29, which was enabled during the safing
sequence. Observations of NGC3115, PSR J1650-4341, NGC 7662, and 1RXS
J170047.8-31444 were impacted and will be rescheduled. Real-time
procedures were executed on Jan 29 to verify that the radiation
environment as observed by the HRC anticoincidence shield had
decreased to an acceptable level and to start a collection of ACIS CCD
charge-transfer inefficiency data. Loads for a replanned schedule were
uplinked on Jan 29 with 163.4ks of science loss.