SDO%20Science%20Working%20Group

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SDO Science Working Group

• W. Dean Pesnell

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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 230-530
• 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)
• Summary of Wednesday's discussion
• Opportunity for questions
• Announcement of next SWG meeting data

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HGA Obscuration
During equinoxes the combination of Earths
rotation axis (where the HGA points) and
orienting SDO toward solar north causes the solar
panel to obstruct each HGA once per day.
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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.