Advanced Baseline Imager

Advanced Composition Explorer

Atmospheric Composition Modeling and Analysis Program

Advanced Camera for Surveys

adiabatic demagnetization refrigerator

American Geophysical Union

Atmospheric Imaging Array

American Institute of Aeronautics and Astronautics

Aeronomy of Ice in the Mesosphere

Atmospheric Infrared Sounder

All-Sky Imaging Survey

Atacama Large Millimeter/Submillimeter Array

Advanced Microwave Scanning Radiometer

Advanced Microwave Sounding Unit

Announcement of Opportunity

Applied Physics Laboratory

Aeronautics and Space Engineering Board

Advanced Spaceborne Thermal Emission and Reflection Radiometer

Advanced Telescope for High-Energy Astrophysics

astronomical unit

Association of Universities for Research in Astronomy

Advanced Very High Resolution Radiometer

Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation

cost and technical evaluation

charged-coupled device

compact coronagraph

Clouds and the Earth’s Radiant Energy System

Compton Gamma-Ray Observatory

Cloud Imaging and Particle Size

Climate Absolute Radiance and Refractivity Observatory

coronal mass ejection

Centre National d’Etudes Spatiales (French Space Agency)

Cosmic Background Explorer

complexity-based risk assessment

Composition and Distribution Function

Comisión Nacional de Actividades Espaciales (Argentina’s National Committee of Space Activities)

Cosmic Origins Spectrograph

Corrective Optics Space Telescope Axial Replacement

Canadian Space Agency

CubeSat to Study Solar Particles

Cyclone Global Navigation Satellite System

Deutsches Zentrum für Luft- und Raumfahrt (German Aerospace Agency)

Defense Meteorological Satellite Program

U.S. Department of Defense

U.S. Department of Energy

Deep Space 1

Energetic Particle, Composition, and Thermal Plasma Suite

Energetic Gamma Ray Experiment Telescope

Energetic Neutral Atom

El Niño Southern Oscillation

explanation of change

Earth Observing System

Earth Observing System Data Information System

European Space Agency

Earth System Science Pathfinder

Earth Science Technology Office

Earth Science Technology Program

Earth Venture

Field Measurement Experiment

Faint Object Camera

Faint Object Spectrograph

full-time equivalent

far ultraviolet

fiscal year

U.S. Government Accountability Office

gigaelectron volt

German Research Center for Geosciences

Goddard High Resolution Spectrograph

Gravity Recovery and Climate Experiment

GRACE Follow-On

Gravity Recovery and Interior Laboratory

gamma-ray bursts

Goddard Space Flight Center

Global Space-based Inter-Calibration System

High Resolution Dynamics Limb Sounder

Heliophysics Science Division

High Speed Photometer

Hubble Space Telescope

Ice, Cloud, and Land Elevation Satellite

Independent Comprehensive Review Panel

ion propulsion system

infrared

Interface Region Imaging Spectrograph

Integrated Science Investigation of the Sun

Jet Propulsion Laboratory

James Webb Space Telescope

Korea Astronomy and Space Science Institute

Kuiper Belt object

Key Decision Point

kiloelectron volt

kilometer

Laser Interferometer Gravitational-Wave Observatory

Lunar Reconnaissance Orbiter

Mars Astrobiology Explorer-Cacher

Mars Exploration Rover

Mercury Surface, Space Environment, Geochemistry, and Ranging

megaelectron volts

medium Explorer

Miniature X-Ray Solar Spectrometer

Medium Imaging Survey

Multi-Angle Imaging Spectroradiometer

Microwave Limb Sounder

Magnetospheric Multiscale

Moderate Resolution Imaging Spectroradiometer

Measurements of Pollution in the Troposphere

Mars Reconnaissance Orbiter

Mars Science Laboratory

Near-Earth Object Camera

Near-Earth Object Wide-field Infrared Survey Explorer

Near-Earth Object Wide-field Infrared Survey Explorer-Reactivation

Near Infrared Camera and Multi-Object Spectrometer

National Oceanic and Atmospheric Administration

NASA Procedural Requirement

National Reconnaissance Office

National Science Foundation

Nuclear Spectroscopic Telescope Array

near ultraviolet

Operational Land Imager

Office of Management and Budget

Ozone Measuring Instrument

Office of Science and Technology Policy

Preliminary Design Review

principal investigator

Plasma Instrument for Magnetic Sounding

Plasma and Supra-Thermal Ion Composition

Polar Mesospheric Cloud

parsec

Planetary Science Deep Space SmallSat Studies

Radiation Budget Instrument

Radiation Belt Storm Probe

Radiation Belt Storm Probes Ion Composition Experiment

Research Opportunities in Space and Earth Sciences

solar diffuser stability monitor

Sun-Earth Connection Coronal and Heliospheric Investigation

solar electric propulsion

Space Environment Simulator

Stanford Linear Accelerator Center

servicing mission

Soil Moisture Active Passive

Science Mission Directorate

small Explorer

Stratospheric Observatory for Infrared Astronomy

Solar Occultation for Ice Experiment

Solar Orbiter Heliospheric Imager

Solar Radiation and Climate Experiment

Senior Review

spectroradiometric calibration assembly

Space Studies Board

science, technology, engineering, and mathematics

Solar Terrestrial Relations Observatory

Space Telescope Imaging Spectrograph

Space Telescope Science Institute

Stereo Waves Experiment

Solar Wind Electron Analyzer

Solar Wind Electrons Alphas and Protons

shortwave infrared

Southwest Research Institute

Soft X-ray Spectrometer

Tropospheric Emission Spectrometer

thermal infrared

Thermal Infrared Sensor

transition quarter

technology readiness level

Time-resolved Observations of Precipitation Structure and Storm Intensity with a Constellation of SmallSats

Two Wide-angle Imaging Neutral-atom Spectrometers

University Corporation for Atmospheric Research

unallocated future expense

ultra-low frequency

University of New Hampshire

U.S. Geological Survey

ultraviolet

ultraviolet/optical/infrared

Very Local Interstellar Medium

visible and near infrared

Wide-field Camera

Wide-field Infrared Survey Telescope

Wide-field Planetary Camera

Wind Experiment

Wide-field Infrared Explorer

Wide-field Infrared Survey Explorer

Wide-field Imager for Parker Solar Probe

whole-time equivalent