From Aug 03 2011 SOT Shift Report --------------------------------- SIGNIFICANT SOLAR ACTIVITY: there was a major proton event in region 11261, a long duration M flare peaking at 06:19 Aug 2. The blast hurled a CME almost directly toward Earth. The region produced another long duration M1.1 event peaking at 03:37 UTC today. Yesterday's Earth directed CME showed up in the GOES X-ray flux and was observed in LASCO and STEREO images. Its main body will likely reach Earth sometime after 09h UTC tomorrow, but we are already seeing a strongly rising ACE proton flux. According to a 3-dimensional model of the CME by analysts at the GSFC Space Weather Lab made, the cloud left the sun traveling 900 km/s and should reach Earth on August 5th at 0300 UT plus or minus 7 hours. Major flares are also possible in region 11263, trailing 11261 by a couple of days. From Aug 05 2011 SOT Shift Report --------------------------------- Looks like first of 3 CME's hit just before 00:00 today. ACE soft protons went up to 10,000 but had been steadily decreasing to about 3500 which is a level that ACIS could tolerate for the rest of the orbit. HOWEVER, it appears the second CME hit about 1100 this morning, and soft protons are now increasing again. A third CME is on the way. Current GOES P2 channel protons just barely below the 1/3 threshold at which we would consider resuming, but at the moment (1400) are descreasing. From Aug 04 Email (M. Juda) ---------------------------- At the 216:11:45-12:45z comm pass it was discovered that SCS-107 triggered at 2011:216:07:03:34z due to high radiation (~1/2 hour before the scheduled RadMon disable for radiation zone entry). SCS-107 ran nominally. The GOES rates were not high enough to suggest that either of the EPHIN channels triggered. There is a high momentum violation (above planning threshold) at 14:30:15 but initial review of the propagation shows no cocern for an auto-unload until the next perigee pass. From Aug 05 Email ------------------ Result of "Radiation re-start(?) telecon" ACE P3 fluxes were high (~80000 particles/cm2-s-ster-MeV) at the start of the telecon. Would need to average >10000 for the remainder of the orbit for ACIS to be good with observing. Based on ACIS health we decided not to try to resume science observing with an uplink of AUG0711A products during the 217:18:25-19:25z pass. With a plan to not uplink the loads the CAP to check the HRC antico shield rates is deferred until a later comm. From Aug 06 Email ----------------- At the 218:19:10-20:10z comm pass the GOES and EPHIN rates were well below the 1/3 threshold levels used as a criteria for resuming the science mission.