Transcript P2_Pesnell.SWG.ppt

SDO Science Working
Group
W. Dean Pesnell
SDO SWG, February 2006
Agenda
Monday morning (20 minutes):
1) Description of Wednesday afternoon and listing of topics.
2) Description of the high-gain antenna blockage issue
SWG Wednesday 2:30-5:30
1) Instrument Book
2) Proposal to use NASA Supercomputer resources
3) Metadata
4) Other working groups
4) Future meetings and conferences
5) Discussion of E/PO
Thursday morning (30 minutes)
1) Summary of Wednesday's discussion
2) Opportunity for questions
3) Announcement of next SWG meeting data
SDO SWG, February 2006
HGA Obscuration
During equinoxes the combination of Earth’s rotation axis (where
the HGA points) and orienting SDO toward solar north causes the
solar panel to obstruct each HGA once per day.
SDO SWG, February 2006
HGA Obscuration
In essence, the
analysis neglected
the contribution of
the tilt of the
ecliptic when
determining the roll
of the observatory.
This has been corrected for the nominal mission by transmitting dual
polarizations and changing antennas when necessary. If a HGA fails
the observatory will need to fly at an offset to solar north.
SDO SWG, February 2006