HMI Top Level Requirements

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HMI Top Level Requirements
HMI00447

• Rock Bush
• Stanford HMI Program Manager
• RBush_at_solar.stanford.edu

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Requirements Overview

• Basis of Requirements
• Requirements Sources
• Draft HMI Functional Specifications

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Basis of Requirements

• HMI Science Objectives
• Duration of mission
• Completeness of coverage
• HMI Science Data Products
• Roll accuracy
• Time accuracy (months)
• HMI Observation Sequences
• Duration of sequence
• Cadence
• Completeness data sequence
• Noise
• Resolution
• Time accuracy (days)
• HMI Observables
• Sensitivity
• Linearity
• Acceptable measurement noise
• Image stability
• Time rate (minutes)

• HMI Instrument Data
• Accuracy
• Noise levels
• Completeness of filtergrams
• Tuning shutter repeatability
• Wavelength knowledge
• Image registration
• Image orientation jitter
• HMI Instrument Concept
• Mass
• Power
• Telemetry
• Envelope
• Subsystem requirements
• CCD Thermal environment
• ISS pointing drift rate, jitter
• Legs pointing drift range

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Basic Requirements Sources

• SDO Level 1 Requirements
• SDO Mission Requirements Document (MRD)
• Summary of spacecraft and instrument driving
  requirements
• HMI Instrument Functional Specification
• Top level HMI requirements part of the HMI
  contract statement of work
• HMI Instrument Performance Document (IPD)
• Detailed HMI science drivers and flowdown to
  subsystem requirements
• SDO Mission Assurance Requirements
• SDO spacecraft and instrument requirements for
  design, fabrication, verification, etc.
• HMI Performance Assurance and Implementation Plan
  (PAIP)
• HMI implementation of the SDO MAR
• HMI to Spacecraft Interface Control Documents
  (HMI-S/C ICD)
• Ground System Interface Control Document

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HMI Requirements

• The HMI Functional Specification is the
  contractual link between the SDO project office
  and the HMI development team.
• The Functional Specification documents the key
  instrument parameters needed to meet the HMI
  goals.
• The Draft Functional Specification is summarized
  in the next chart, and the verification will be
  discussed during the test and integration
  presentation.
• The Functional Specification is under review and
  will be finalized as part of the Phase C/D
  contract negotiations.
• The HMI Instrument Performance Document (IPD)
  details the HMI observations required to meet the
  science goals, and the derived subsystem design
  and performance requirements.
• The IPD contains three sections
• Instrument observations required to meet the
  science objectives
• Instrument performance requirements needed to
  obtain the observations
• Detailed subsystem design specifications needed
  to obtain the specified performance
• The HMI Performance Document is modeled after the
  Michelson Doppler Imager Instrument Performance
  Specification.

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HMI Functional Specifications Summary