Important notice about reduced STEREO
The STEREO Ahead observatory is back to normal operations on the first side
lobe. All the instruments have been powered back on, and are producing science
data. The IMPACT SWEA and STE instruments are turned off, and will remain off
until the high gain antenna is returned to its main lobe in November. Because
of the current difficulties with commanding due to solar scintillation effects
at such a small separation angle from the Sun, the SIT instrument is using the
original table set that the instrument was launched with. This table set is
known to have some calibration problems, but this is considered to be better
than having no data at all. He intensities are about a factor of five too low,
while the H, O, and Fe intensities are approximately correct (within a factor
of two). The IMPACT team plans to upload the most current table set on August
26. See this important notice for more
information about superior solar conjunction.
Communications with the STEREO Behind spacecraft were interrupted on October 1,
2014 immediately after a planned reset of the spacecraft performed as part of a
test of solar conjunction operations. The spacecraft telemetry indicated an
anomaly in the guidance and control system, but this is still being
evaluated. No further communications have been successful since Oct. 1st.
for more information.
Attempts to reestablish communications with the STEREO Behind spacecraft are
Launched in 2006, the STEREO mission achieved its prime science goals within
the two-year prime mission, but continues to explore solar and heliospheric
activity through the current solar maxmimum and beyond.
Last Revised: Tuesday, 18-Aug-2015 15:04:02 EDT
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