Definitions and Acronyms

FoV= Field of View
IWA = Inner Working Angle
OWA = Outer Working Angle
Dark hole =  The deepest contrast FoV of a given mode, the zone defined by IWA and OWA and where the wavefront control is effective.

DM = Deformable Mirror

PSF = Point Spread Function
ADI =  Angular Differential Imaging
RDI = Reference Differential Imaging 

HLC = Hybrid Lyot Coronagraph
SPC = Shaped Pupil Coronagraph
EMCCD = Electron Multiplying  CCD

ETC = Exposure Time Calculator

GITL = Ground-in-the-Loop

HOWFSC = High-order wavefront sensing and control. Refers to the spatial frequencies being sensed and controlled.  See also: LOWFSC.

LOWFSC = Low-order wavefront sensing and control. Refers to the spatial frequencies being sensed and controlled.  See also: HOWFSC.

Band 1 = Imaging mode, centered at 575 nm, with 10% bandwidth.

Band 2 = Spectroscopic mode, centered at 660 nm, with 17% bandwidth

Band 3 = Spectroscopic mode, centered at 730 nm, with 17% bandwidth

Band 4 = Imaging mode, centered at 825 nm, with 10% bandwidth

NF/NFOV = Narrow Field-of-View (0.15”-0.45”), available in Band 1 with the Hybrid Lyot Coronagraph (HLC)

WF/WFOV = Wide Field-of-View (0.45”-1.45”), available in Band 1 with the HLC and in Band 4 with the SPC.

TTR/TTR5 = Threshold Technical Requirement #5: Roman shall be able to measure (using CGI), with SNR ≥ 5, the brightness of an astrophysical point source located between 6 and 9 λ/D from an adjacent star with VAB magnitude ≤ 5, with a flux ratio ≥ 10-7; the bandpass shall have a central wavelength ≤ 600nm and a bandwidth ≥ 10%

CPP = Community Participation Program
CTC = Coronagraph Technology Center (based at JPL)
SSC = Science Support Center (based at IPAC)
SOC = Science Operations Center (based at STScI)
CorGI-DRP = Coronagraph Instrument Data Reduction Pipeline (in development)
OS11 = Observing Scenario 11, an Observation Cycle Concept, with exposures from Reference and Target Star pairs.

TVAC = Thermal vacuum