Acronym Dictionary

LASCO ACRONYM DICTIONARY

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AAD
Attitude Anomaly Detector
AAS
American Astronomical Society
ACE
Advanced Composition Explorer
ACS
Attitude Control System
ACU
Attitude Control Unit
ADC
Analog to Digital Converter
ADCT
Adaptive Discrete Cosine Transform
ADS
NASA Astrophysical Data System
AFSCF
Air Force Satellite Control Facility
AFSCN
Air Force Satellite Control Network
AFT
Abbreviated Functional Test
AI
Associate Investigator
Artificial Intelligence
AIT
Assembly, Integration and Test
Atomic International Time (SeeTAI )
AIV
Assembly-Integration-Verification
AN
Analog
ANT
Antenna
ANTS
Antenna Subsystem
ApJ
The Astrophysical Journal
AOCE
Attitude and Orbit Control Electronics
AOCMS
Attitude and Orbit Control Measurement System
AOCS
Attitude and Orbit Control System
AOS
Acquisition of Signal
APID
Application Identification
APM
Antenna Pointing Mechanism
APME
Attitude Pointing Mechanism Electronics
ARC
Ames Research Center
ASIC
Application Specific Integrated Circuit
ASICA
Analytyx Spacecraft Instrument Controller ASIC
ASW
Address and Synchronization Word
Application Software
ATSC
AlliedSignal Technical Services Corporation
AU
Mean distance between the sun and the earth (1.6 million kilometers, 100 million miles, 215 solar radii)
AUX
Auxiliary
AVD
Alternate Voice/Data

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BARM
Block Acceptance Reporting Mechanism
BAS
Block Acquisition Sequence
BPS
Bits per second (bps)
Bytes per second (Bps)
BCP1
Broadcast Pulse 1
BCP3
Broadcast Pulse 3 (LOBT clock)
BDR
Battery Discharge Regulator
BECO
Booster Engine Cutoff
BER
Bit Error Rate
BI0-L
Biphase - Low
BITNET
Because It is Time NETwork
BOL
Beginning of Life
BRU
Battery Regulation Unit

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C1
LASCO C1 Telescope (1 - 3 solar radii)
C2
LASCO C2 Telescope (1.7 - 6 solar radii)
C3
LASCO C3 Telescope (3.7 - 32 solar radii)
CAN
Canberra (DSN Station)
CCAFS
Cape Canaveral Air Force Station
CCB
Configuration Control Board
CCD
Charge Coupled Device
CCR
Configuration Change Requests
CCS
Central Checkout System
CCSDS
Consultive Committee for Space Data Systems
CCTV
Close Circuit Television
C&DH
Command and Data Handling
CDDI
Copper Distributed Data Interface
CDF
Common Data Format
CDHF
Central Data Handling Facility
CDR
Critical Design Review
CDS
Coronal Diagnostic Spectrometer
CE
Communications Engineer
Customer Engineer
CELIAS
Charge, Element and Isotope Analysis System
CEPAC
COSTEP-ERNE Particle Analysis Collaboration
CfA
Harvard-Smithsonian Center for Astrophysics, USA
CMD
Command
CME
Coronal Mass Ejection
CMS
Command Management System
CNRS
Centre National de la Recherche Scientifique
COB
Coronagraph Optical Box
COBS
Central On Board Software
COSTEP
Comprehensive Supra Thermal and Energetic Particle Analyzer
COSTR
Collaborative Solar-Terrestrial Research
COTS
Commercial Off the Shelf Software
CPM
Command Pulse Module
CR
Carrington Rotation
CRC
Cyclical Redundancy Coding
CRT
Cathode Ray Tube
CSPAAD
Coarse Sun Pointing Attitude Anomaly Detection
CSSA
Center for Space Science and Astrophysics (Stanford)
CTOF
Charge Time-Of-Flight
Co-I
Co-Investigator

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D/L
Downlink
DAA
Data Availability Acknowledgment
DACS
Data Acquistion Control Software (GSE)
DAN
Data Availability Notice
DAT
Digital Audio Tape
dB
Decibels
DB
Digital Bilevel acquisition
Database
DBMS
Database Management System
DC
Direct Command
DCF
Data Capture Facility
DCN
Document Change Notice
DDA
Data Delivery Acknowledgement
DDF
Data Distribution Facility
DDIS
Data Distribution GSE Software
DDN
Data Delivery Notice
Direct Dial Network
DEL
Delete
DEM
Demodulator
DFCD
Data Format Control Documents
DFD
Data Flow Diagram
DGS
Diego Garcia Station
DHP
Direct High Power
DHSS
Data Handling Subsystem
DIARAD
Dual Irradiance Absolute Radiometer (on VIRGO)
DM
Data Management
DMF
Data Management Facility
DML
Direct Memory Load
DN
Digital Number
DOD
Department of Defense
DRF
Data Reduction Facility
DSCC
Deep Space Communications Complex (NASA/JPL)
DSN
Deep Space Network
DSR
Department of Space Research, University of Birmingham, Birmingham, England
DECnet
Digital Equipment Corporation Network

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EAA
Earth Attitude Angle
EAF
SOHO Experimenter Analysis Facility
EARN
European Academic Research Network
ECS
EOF Core System
EDL
Ethernet Data Link
EEPROM
Electrically Eraseable PROM
EGSE
Electrical Ground Support Equipment
EHP
Extended High Power
EHPC
Extended High Priority Command
EID
Experiment Interface Document
EIT
Extreme-ultraviolet Imaging Telescope
ELEC
Electronics
ELV
Expendable Launch Vehicle
EM
Engineering Model
EOF
SOHO Experimenter's Operations Facility
EOM
End of Mission
EPA
Energetic Particle Analyzer
EPHIN
Electron Proton Helium Instrument
EPSS
Electrical Power Subsystem
ERNE
Energetic and Relativistic Nuclei and Electron Experiment
ESA
European Space Agency
ESDOC
European Science Data and Operations Center
ESMC
Eastern Space and Missile Center
ESOC
European Space Operations Centre (ESA, Darmstadt)
ESPOCC
European Space Project Operations Control Center
ESR
Emergency Sun Reacquisition
ESTEC
European Research and Technology Center
ESTRACK
European Space Tracking (Network)
Ethernet
Local area network defined by ISO 802.3
EU
Engineering Unit
EUV
Extreme Ultra-Violet
EXP
Experiment
Exposure

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FAC
Facility
FDD
Flight Dynamics Division
FDDI
Fiber Distributed Data Interface
FDF
Flight Dynamics Facility
FDSS
Flight Dynamics Support System
FEE
Front-End Equipment
FFT
Fast Fourier Transform
FIFO
First In First Out
FITS
Flexible Image Transport System
FM
Flight Module
FMI
Finnish Meteorological Institute, Finland
FPEB
Fabry-Perot Electronics Box
FP, FPI
Fabry-Perot Interferometer
FOP
Flight Operations Plan
FOR
Flight Operations Review
FOT
Flight Operations Team
FOV
Field of View
FPSS
Fine Pointing Sun Sensor
FPSSE
Fine Pointing Sun Sensor Electronics
FPSSH
Fine Pointing Sun Sensor Head
FRD
Functional Requirements Document
FRR
Flight Readiness Review
FSA
Fine Sun-pointing Acquisition mode
FSPAAD
Fine Sun Pointing Attitude Anomaly Detection
FTP
File Transfer Protocol
FTR
Flight Tape Recorder
FWHM
Full Width at Half Maximum

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GB
Gigabyte
GDCF/Pacor
ISTP Program Generic Data Capture Facility / Packet Processor
GDS
Ground Data System, Goldstone (DSN station)
GenSAA
Generic Spacecraft Analysis Assistant
GEOTAIL
Geomagnetic Tail Laboratory
GGS
Global Geospace Science
GI
Guest Investigator
GIF
Graphics Image Format
GIGO
Garbage In Garbage Out
GMT
Greenwich Mean Time
GO
Guest Observer
GOLF
Global Oscillations at Low Frequency
GONG
Global Oscillations Network Group
GS
Ground System
GSE
Ground Support Equipment
Ground Support Electronics
Geocentric Solar Ecliptic Coordinate System:
A 3-axis (x,y,z) coordinate system, with the Earth at its center, and where the x-axis points to the Sun, the z-axis is perpendicular to the Ecliptic plane, and the y-axis is perpendicular to both the x and z axies with a positive direction opposite to the Earth's motion around the Sun.
GSFC
Goddard Space Flight Center
GSIRD
Ground Data System Information Requirements Document

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H/W
Hardware
HAO
High Altitude Observatory, NCAR, Boulder, CO
HBR
High Bit Rate
HDR
Hardware Design Review
HED
High Energy Detector
HGA
High Gain Antenna
HK
Housekeeping
HOI
Halo Orbit Insertion
HOP
Halo Orbit Phase
HQ
Headquarters
HR
High Rate
HSIO
High Speed Input/Output
HTML
Hypertext Markup Language
HTTP
Hypertext Transfer Protocol
Hz
Hertz

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I&T
Integration and Test
I&TRR
Integration and Test Readiness Review
IAC
Instituto de Astrofisica de Canarias, Spain
IAS
Institut d'Astrophysique Spatiale, Orsay, France
ICA
Integration Control Agreement
ICD
Interface Control Document
ICE
Instrument Control Executive
ID
Identification
Idle Format
IDL
Interactive Data Language from Research Systems, Inc
I/F
Interface
IKI
Institut Kosmicheskikh Issledovanii
I/O
Input/Output
INIT
Initialization
INTSIM
S/C Interface Simulator
IOS
Indian Ocean Station
IP
Internet Protocol
IPD
Information Processing Division
IRD
Information Requirements Document
IRU
Inertial Reference Unit
ISA
Initial Sun Acquisition
ISAS
Institute of Space and Astronautical Science
ISTP
International Solar-Terrestrial Physics
IUE
International Ultraviolet Explorer
IWS
Instrument Work Stations

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JD
Julian Day. Obtained by counting days from the starting point of noon on 1 January 4713 BC (Julian Day zero).
JPL
Jet Propulsion Laboratory
JSC
Johnson Space Center

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Kbps, kbps
Kilobits per second
Kilobytes per second (Kbps)
KPNO
Kitt Peak National Observatory
KSC
Kennedy Space Center

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L
Launch
LAN
Local Area Network
LAS
Laboratoire d'Astronomie Spatiale, Marseille, France
LASCO
Large Angle Spectrometric Coronagraph
LCL
Latching Current Limiter
LEB
LASCO Electronics Box
LED
Low Energy Detector
Light Emitting Diode
LEOP
Launch and Early Orbit Phase
LeRC
Lewis Research Center
LGA
Low Gain Antenna
LION
Low Energy Ion and Electron Instrument
LOBT
Local On Board Time
LOI
Luminosity Oscillations Imager (on VIRGO)
LOS
Loss of Signal
LP
LEB Program
LPARL
Lockheed Palo Alto Research Laboratories
LR
Low Rate
LRR
Launch Readiness Review
LSB
Least Significant Bit
LV
Launch Vehicle

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MAR
Mission Analysis Room
MB
Megabyte
MCC
Mid Course Correction
MCP
Micro Channel Plate
MDI
Michelson Doppler Imager
MDI-H
MDI-Helioseismology
MDI-M
MDI-Magnetogram
MECO
Main Engine Cutoff
MELICA
Medium Energy Ion Composition Analyzer
MES
Main Engine Start
MHZ
Megahertz
MIL
Merritt Island (GN Station)
MILA
Merritt Island Launch Area
MIL-71
Merritt Island DSN Facility
MJD
Modified Julian Date - Equal to the Julian Day, but shifted so its origin occurs at midnight on 17 November 1858. The MJD differs from the Julian date by exactly 2 400 000.5 days. The MJD of the SOHO launch on 5 Dec 1995, is 50056.
MLI
Multi-Layer Insulation
MMS-F
Matra Marconi Space-Toulouse, France
MMS-UK
Matra Marconi Space-Portsmouth, United Kingdom
MO&DA
Mission Operations and Data Analysis
MO&DSD
Mission Operations and Data Systems Directorate
MOA
Mission Operations Area
MOC
Mission Operations Center
MODNET
MO&DSD Operational/Development Network
MOM
Mission Operations Manager
MOR
Mission Operations Review
Mission Operations Room
MOWG
Mission Operations Working Group
MP&A
Mission Planning and Analysis Area
MPAE
Max-Planck-Institut fuer Aeronomie, Germany
MR
Medium Rate
MSB
Most Significant Bit
MSSL
Mullard Space Science Laboratory, UK
MTOF
Mass-Time-of-Flight

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N/A
Not Applicable
NASA
National Aeronautics and Space Administration
NASCOM
NASA Communications
NFS
Network File System
NOAA
National Oceanic and Atmospheric Administration
NOAO
National Optical Astronomy Observatories
NOCC
Network Operations Control Center (DSN)
NRL
Naval Research Laboratory, USA
NRT
Near Real-Time
NRZ-L
Non Return to Zero Level
NSI
NASA Science Internet
NSO
National Solar Observatory
NSSDC
National Space Science Data Center

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OBC
On Board Computer
OBDH
On Board Data Handling
OBE
Observation Executive
OBT
On-Board Time
OSO
Orbiting Solar Observatory
OSSA
Office of Space Science and Applications

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P/B
Playback
P/M
Payload Module
PACOR
Packet Processor
PACORII
Packet Processor Data Capture Facility II
PAD
Pressure Anomaly Detection
PB
Playback
PC
Personal Computer
PCE
PROM Card Executive
PCM
Pulse Code Modulation
PDB
Project Data Base
PDR
Preliminary Design Review
PDU
Power Distribution Unit
PI
Principal Investigator
PLM
Payload Module
PMOD
Physikalisch-Meteorologisches Observatorium Davos
PMP
Project Management Plan
POCC
Payload Operations Control Center
POLAR
Polar Plasma Laboratory
PROM
Programmable Read Only Memory
PROS
Propulsion Subsystem
PRTC
Priority Real Time Commands
PSK
Phase Shift Keying
PVL
Parameter Value Language
PZT
Piezoelectric Transducer

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QA
Quality Assurance
QAC
Quality and Accounting Capsule

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Rad
Radian
R/T
Real-Time
RAAD
Roll Attitude Anomaly Detection
RAAM
Roll Attitude Acquisition Mode
RAD
Roll Attitude Determination
RAL
Rutherford Appleton Laboratory, UK
RAM
Random Access Memory
RCR
Remote Command Request
RD
Reference Document
RDBMS
Relational Data Base Management System
Re
Earth Radii
RF
Radio Frequency
RFDU
Radio Frequency Distribution Unit
RID
DSN Station at Madrid, Spain
RID
Review Item Disposition
RM
Reconfiguration Module
RMW
Roll Maneuver Wheels
ROM
Read Only Memory
RPC
Remote Procedure Calls
RPR
Remote Procedure Request
rpm
Revolutions per minute
RRAD
Roll Rate Anomaly Detection
Rs
Solar Radius
RS, R/S, R-S
Reed-Solomon
RSS
Root Sum Square
RT
Real-Time
RTU
Remote Terminal Unit
RUST
Remote User Scheduling Terminal
RW
Reaction Wheel
RX
Receive

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S/C
Spacecraft
S/W
Software
SAD
Solar Array Deployment
SAM
Sun Acquisition Mode
SAS
Solar Acquisition Sensor
SCAMA
Switching, Conferencing and Monitoring Arrangement
SCI
Real-time Science Data Format
SCID
Spacecraft Identification
SDB
Spacecraft Data Base
SDPF
Sensor Data Processing Facility
SDR
System Design Review
SECO
Sustainer Engine Cutoff
SEC
NOAA Space Environment Center
SEL
NOAA Space Environment Laboratory
SELDADS
SEL Data Acquisition and Display System
SELSIS
SEL Solar Imaging System
SEU
Single Event Upset
SFDU
Standard Formatted Data Unit
SFT
System Functional Test ST
Sidereal Time: The measure of time defined by the apparent diurnal motion of the vernal equinox, hence, a measure of the rotation of the Earth with respect to the reference frame that is related to the stars rather than the Sun. Two types of sidereal time are used in astronomy: mean sidereal time and apparent sidereal time. One sidereal day is equal to about 23 hours, 56 minutes and 4.090 seconds of mean solar time. Also 366.2422 mean sidereal days equal 365.2422 mean solar days.
SIM
Simulator
Solar Irradiance Monitor
SLC
Space Launch Complex
SM
Structural Model
SMIP
SOHO Mission Implementation Plan
SMIRD
SOHO Mission Implementation Requirements Document
SMM
Solar Maximum Mission
SMOC
SOHO Science and Mission Operations Center
SMOCC
SOHO Mission Operations Control Center
SOC
Science Operations Coordinator
Simulations Operations Center
SOCA
Special Operations Control Area
SOHO
Solar and Heliospheric Observatory
SOI
Solar Oscillations Imager
Solar Oscillations Investigation
SOL
Science Operations Leader
SOP
Science Operations Plan
SOT
Science Operations Team
SOTA
Science Operations and Test Area
SOWG
SOHO Science Operations Working Team
SPAN
Space Physics Analysis Network
SPD
Solar Physics Division
Space Physics Division
SPDS
Space Physics Data System
Solar Physics Data System
SPL
Split Phase Level
SPM
Sunphotometer (on VIRGO)
SPOF
Science Planning and Operations Facility
SQL
Structured Query Language
SRB
System Review Board
SRB
Solid Rocket Booster
SRD
System Requirements Document
SRM
Solid Rocket Motor
SRR
System Requirements Review
SRS
System Requirements Specification
SSD
Space Sciences Division
SSR
Software Specification Review
Solid State Recorder
SSTS
Service Module (SVM) Structure Subsystem
SSU
Star Sensor Unit
STC
Satellite Test Center
STCS
Service Module Thermal Control Subsystem
STDN
Spaceflight Tracking and Data Network
STOF
Suprathermal-Time-Of-Flight
STOL
System Test and Operations Language
STR
System Test Review
STS
Star Tracker Sensor
STSP
Solar Terrestrial Science Programme
SU
Stanford University
SUM
SOHO User's Manual
SUMER
Solar Ultraviolet Measurements of Emitted Radiation
SVM
Service Module
SWAN
Solar Wind ANisotropies
SWT
Science Working Team

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T&DA
Telemetry and Data Acquisition
T&DS
Tracking and Data Systems/JPL
TAB
Timing and Acquisition Bit
TAC
Telemetry and Command Computer
TAI
Temps Atomique International
TBC
To Be Confirmed
TBD
To Be Defined
TC
Telecommand
TCP
Transmission Control Protocol
TCS
Thermal Control Subsystem
TDA
Telecommunications and Data Acquisition
TDR
Test Discrepancy Report
TLA
Three Letter Acronym
TLAN
TPOCC LAN
TLM
Telemetry
TOD
Time-out detection
TPOCC
Transportable POCC
TR
Tape Recorder
TRB
TDR Review Board
TRK
Tracking
TRPSA
Transponder Assembly
TRR
Test Readiness Review
TSTOL
TPOCC System Test and Operations Language
TT
Time-Tagged
TT&C
Telemetry, Tracking and Command
TTB
Time-Tagged Buffer
TTI
Transfer Trajectory Insertion
TTP
Transfer Trajectory Phase
TVCF
Transportable Vehicle Checkout Facility
TTY
Teletype
TX
Transmit

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UL, U/L
Uplink
UPS
Uninterruptable Power Supply
URL
Uniform Resource Locator
USO
Ultra Stable Oscillator
UT
Universal Time
UTC
Coordinated Universal Time
Universal Time Code
A coordinated time scale, maintained by the Bureau Interanational des Poids et Mesures (BIPM). A UTC clock has the same rate as a TAI clock, but differs by an integral number of seconds called leap seconds.
UV
Ultraviolet
UVCS
UltraViolet Coronagraph Spectrometer

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VC
Virtual Channel
VCID
Virtual Channel Identification
VCXO
Voltage Controlled Crystal Oscillator
VDS
Virtual Data Set
VID
Vehicle Identification Number
VIRGO
Variability of solar IRradiance and Gravity Oscillations

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W
Watts
WBS
Work Breakdown Structure
WDE
Wheel Drive Electronic
WIND
Interplanetary Physics Laboratory
WS
Work-Station
WSMC
Western Space and Missile Center
WSO
Wilcox Solar Observatory
WWW
World Wide Web
WYSIWYG
What You See Is What You Get

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XDR
External Data Representation
XMT
Transmit
XPNDR
Transponder

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This page last revised 22 May 1997