A. List of Acronyms

AAL

Acronym to indicate the LWS Auto-Analysis programme.

AAR

Auto-Analysis Result. This is a generic name for the results of the Auto-Analysis programme. For LWS it usually refers to the LSAN product file, but it can also include the other product files generated by Auto-Analysis (LSNR, LGIF, LSCA, LIAC).

ADC

Analogue to Digital Converter

AMAG

Anamorphic Magnification (the ratio of the diameter in the dispersion direction to that in the non-dispersion direction)

APU

Analogue Processing Unit

AOT

Astronomical Observation Template: the standard observing modes for the ISO instruments.

COIF

Calibration Observation Implementation File. Such files were used to define an observation which had to be performed in a non-standard mode, i.e. not using the AOTs

CSH

Compact Status History

DPU

Digital Processing Unit

ERD

Edited Raw Data. This is a generic name for the raw data files used as an input to the Derive-SPD programme. In the LWS case it usually refers to the LGER, LLER, LSER or LIER files.

EOHA

Executed Observation History per AOT: this file gives for every performed AOT the timing and some information about that AOT (see full description in the ISO Handbook Volume I.

EOHC

Continuous Executed Observation History. Essentially a copy of EOHA

EOHI

Edited Observation History per ICS: This gives for every ICS that was sent to the satellite the timing and some information for that ICS (see full description in the ISO Handbook Volume I.

FET

Field-Effect Transistor

FITS

Flexible Image Transport System

FOV

Field Of View

FP

Fabry-Pérot.

FPL

Long wavelength Fabry-Pérot.

FPS

Short wavelength Fabry-Pérot.

FPU

Focal Plane Unit

FWHM

Full Width Half Maximum.

GUI

Graphical User Interface.

HPDP

Highly Processed Data Products.

ICS

Instrument Command Sequence: command that is translated by the on-board software of the instrument to a sequence of actions. This is the normal way to command the ISO instruments.

IDA

ISO Data Archive.

IDUM

Instrument Data Users Manual.

ISAP

ISO Spectral Analysis Package: software package developed specifically for analysis of data obtained with the two ISO spectrographs (LWS and SWS).

ITK

Instrument Time Key (= sec)

JCMT

James Clerk Maxwell Telescope

LIA

LWS Interactive Analysis: package of IDL routines written to allow the user to interactively inspect, reprocess, and recalibrate their LWS data.

L01-4

names attributed to the four observing modes (also called AOTs) , L01 and L02 are grating modes and L02 and L03, Fabry-Pérot modes. They are sometimes noted LWS01 - LWS04

LHe

Liquid Helium

LW1-5

labels for the 5 long wavelength LWS detectors

NEP

Noise Equivalent Power

NEFD

Noise Equivalent Flux Density

NESD

Noise Equivalent Spectral Density

NIR

Near Infrared

M2

the second mirror in the LWS optical path (see Figure 2.2).

OCT

Observatory Command Template: template used to tranfer the commands (instrument or other) to the satellite. This also includes e.g. the pointing requests.

OLP

Off-Line Processing, also referred to as the `pipeline'. It refers to the software that automatically processes the LWS data from the raw telemetry data up to calibrated spectra.

OTF

On-Target Flag

PSF

Point Spread Function

PV

Performance Verification: the initial phase of two months of the ISO operations, when the instrument performance in orbit was tested and characterised.

rms

Root Mean Square

RSRF

Relative Spectral Response Function

SCP

Spacecraft Commissioning Phase: The first three weeks of ISO in orbit operations when all the systems of the satellite and instruments were functionally tested.

SOC

Science Operations Centre

SPD

Standard Processed Data: The result of the first stage of the ISO data processing. This is one of the products that is sent to the observers.

SPL

Acronym for LWS Derive-SPD programme.

SW1-5

labels for the 5 short-wavelength LWS detectors

TDATA

Transparent Data: information about the observation that does not need to be uplinked to the satellite but that is needed to process the data.

TDF

Telemetry Distribution File: The file format in which the data is received from the satellite at the ground station.

TDT

Target Dedicated Time. It is the entire time spent to perform all observations of a concatenated group (in many cases, just one observation). TDT = observation time + overhead time.

UTC

Universal Time (Coordinated)

UTK

Uniform Time Key: the time key that is used as a timekey for all ISO data products (for details see the ISO Handbook Volume I)