Use of Telemetry Submodes and Flag System

It was agreed that for the time being the flag system will not be used.

J.-P. Olive reported that tests at Saab with 16 additional packets did not work, tests with 8 additional packets on the other hand were successful. The day before the SWT meeting ESA has asked Saab to present a schedule for further tests. It was proposed to implement the 8 additional packets and in parallel proceed with further tests.

G.Brueckner asked for a new submode in which SUMER telemetry is redistributed to EIT/ LASCO. Technical limitations: only one sub-mode is freely programmable, others have to be uploaded.

K.Wilhelm made another proposal for telemetry submode switching (see annex 4):

-1mm
• Purpose
  -1mm
  • Prolong SUMER's detectors lifes into the rising solar cycle (support of SOHO's extended mission).
  • Provide some high telemetry rate to EIT/LASCO.
  • Make high telemetry available for SUMER and CDS for certain periods of time. In this mode, SUMER's detectors can be operated more efficiently, as twice as much data can be read out of the detector in the spectral dimensions in many sequences. In addition, it will facilitate high-time resolution studies.
• Constraints
  -1mm
  • CDS wants to continue with the synoptic programme.
  • SUMER would prefer longer periods of mode changes.

It was agreed to have a subcommittee of EIT/LASCO, SUMER and CDS to discuss this issue once technical information has been received on the feasibility and implications of using programmable submodes.