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1.1 Purpose of this manual

This manual is intended to give the LWS observer all necessary information with his data products. Version 4.0 of this manual describes data that was processed through version 6.0 of the LWS Off Line Processing software. Data processed through version 5.X of the processing is described in IDUM issue 3.0, and data that was processed through version 4.X is described in issue 2.0 of the LWS IDUM.

The LWS IDUM should make the observer familiar with the LWS instrument, its operations, the output data, the calibration and the processing. To achieve this the following subjects are addressed:

The LWS instrument and its operations
Some characteristics of the instrument that have implications for the data.
The calibration of the data and the accuracy
An overview of the data processing
A guide to the data products
How to start with the data
Suggested post-processing steps

This manual does not give the calibration data. All data needed for calibration are contained in the files on the CD ROM. This document will point the observer however to the correct files for each of the calibrations which are performed.

Since this manual is intended to give the observer up to date information on the processing and the calibration of the LWS instrument, it will be updated regularly. Every change in the LWS offline processing, the calibration procudures or the file descriptions will be reflected in this manual. More frequently updated information can be found on the LWS instrument page on the World Wide Web: http://www.iso.vilspa.esa.es/instr/LWS.

We would also like to invite observers who have suggestions for improvements to this manual to send an email to the ISO helpdesk (helpdesk@iso.vilspa.esa.es) with these suggestions.

N.Trams, ISO Science Operations Team
Using inputs from:
C.Gry, T. Lim, LWS Instrument Dedicated Team
A.Harwood, P.E.Clegg, B.Swinyard, K.King, LWS Instrument Team
S.Lord, S.Unger, IPAC.