There is a problem with the motor controlling the High Gain Antenna on the SOHO spacecraft. Science data coverage may be less than complete for 1-2 weeks every 90 days (when the spacecraft gets 'flipped'). The next "keyhole" period can be found in this table.
Most Recent Shock Candidates:
Dates
12 Nov 2025
11 Nov 2025
15 Sep 2025
UT
1855
2344
2002
day of year
316
315
258
F/R
fwd
fwd
REV
Zone
3
4
3
Confidence Level
98%
99%
18%
The predicted position of the SOHO spacecraft in the GSE coordinate system (X,Y,Z) in Earth radii at 0610 GMT on Oct 15, 2020:
( 196, -43, 14 )
The Proton Monitor (PM) is one of the scientific sensors in the Charge, Element, and Isotope Analysis System (CELIAS) instrument package aboard the SOHO spacecraft.