XMM Science Operations Centre Archive

INTRODUCTION

The archive includes two different operational scenarios:

On-line Activities

reception of real telemetry (HK and Science), TC History, Mission Planning Files, Operation change request to the Mission Operations Centre

Off-line Activities

Production of Observation Files, Cal data, pipeline processing, reception of proposals for obs, etc.

Although from the physical point of view the SOC will have different disks for the on-line and off-line activities (+ a juke box), the logical view of the archive is a common one ==> one archive for everything.

Archive Functionalities

1. Storage of data generated by SOC from testing stage of the ground segment, ground calibration of instruments through the completion of mission. After the end of mission there will be a run-down exercise. The on-line archive will disappear after the first six months. The off-line will be kept for three years. After this the data will be transferred to a general archive.
2. Storage of auxiliary data
3. Configuration control of the ground segment software, databases, instrument on-board software database, calibration files, etc.
4. Control of access to the data within the XMM archive
5. Provision of archive history log
6. Distribution of data to users
   • Guest observers may access the observation data that they propose
   • After one year of the observation the data gets public
   • Software is distributed for proposal generation, interactive analysis

Access Control

Human Interactions

1. Archive Manager
2. Software Developers
3. Ground Segment Integration & Test Team
4. Configuration Manager
5. SOC Operators
6. Observers
7. Proposal Handlers
8. Mission Planners
9. Calibration Engineer
10. Pipeline Products Validator

Data Types Stored in the Archive

• FITS files
• ISAM files
• sequential files
• binary files
• ascii files

Files Stored in the Archive

• Preferred Observation Sequence
• Planning Skeleton File
• Proposals for Obs
• Observation Data Files
• Pipeline Processing Products
• Science Simulator Outputs
• Interactive Analysis Software
• Previous Missions Catalogues
• Calibration Data
• Commercial Database (Oracle, Sybase, etc.) with subsystem public tables and restricted tables for use by software support
• Target List
• Change Request
• Summary Data
• Short History Files (wrapped around files _ circular buffer - to file the real time TM - HK and Science - )
• Telecommand History
• Timeline Files
• Configuration Files
• SOC Software Source Code

Services

• Internal users access the archive directly without using CCSDS P2 standards. Of course they can access the data that they are authorized to see.
• External users access the archive using P2 standards. (The SFDUs contain the FITS files, etc.)

Wider Views