1. Instrument Performance Requirements
HMI00374
Instrument Performance Requirements
Jesper Schou
Instrument Scientist

2. Instrument Performance Req. – Overview
Observing Scheme
Derivations of Subsystem Requirements
Instrument Performance Document
IPD Development Schedule

3. Observing Scheme Observables
Dopplergrams
Magnetograms, vector and line-of-sight
Others: Intensity, line depth, etc.
Observables made from filtergrams described by framelists
Filtergram properties
Wavelength
Polarization state
Exposure time
Camera ID
Compression parameters, …
Determined by subsystem settings
E.g. motor positions
Framelists
List of filtergrams repeated at fixed cadence during normal operations
Entirely specified in software – Highly flexible

4. Framelist Example
Time: Time of first exposure at given wavelength since start of framelist execution
Tuning: I1, I2, … specify the tuning position
Doppler pol.: Polarization of image taken with Doppler camera
L and R indicate left and right circular polarization
Vector pol.: Polarization of image taken with vector camera
1, 2, 3, 4: Mixed polarizations needed to make vector magnetograms

5. Instrument Performance Document
Purpose
Capture derivations of filtergram and subsystem requirements
Use for testing/calibration/characterization
Capture actual performance
Contents
HMI overview
Instrument overview
Summary of science requirements
Observables to filtergram flow
Details of derivations
Summary of derived requirements
Filtergram to subsystem flow
Summary of requirements for each subsystem
As measured performance
Observable Requirements
Filtergram Requirements
Subsystem Requirements

6. Summary of Filtergram Requirements

7. Summary of Subsystem Requirements

8. IPD Development Schedule
Draft IPD provided with Concept Study Report
Improved draft available at PDR
Complete version by CDR
Continued evolution throughout mission
As measured performance