| AAS | American Astronomical Society |
| ACE | Advanced Composition Explorer |
| ACRs | anomalous cosmic rays |
| ADVANCE | Organizational Change for Gender Equity in STEM Academic Professions |
| AER | Aeronomy (NSF program) |
| AETHER | Aeronomy at Earth: Tools for Heliophysics Exploration and Research |
| AFWA | Air Force Weather Agency |
| AG | analysis/assessment group |
| AGEP | Alliances for Graduate Education and the Professoriate |
| AGS | Atmospheric and Geospace Sciences Division (NSF) |
| AIA | Atmospheric Imaging Assembly |
| AIM | Aeronomy of Ice in the Mesosphere |
| AIM | atmosphere-ionosphere-magnetosphere |
| AIMI | atmosphere-ionosphere-magnetosphere interactions |
| AIP | American Institute of Physics |
| ALMA | Atacama Large Millimeter/submillimeter Array |
| AMISR | Advanced Modular Incoherent Scatter Radar |
| AMPERE | Active Magnetosphere and Planetary Electrodynamics Response Experiment |
| AO | Announcement of Opportunity |
| APD | Astrophysics Division (NASA) |
| AST | Division of Astronomical Sciences (NSF) |
| ATST | Advanced Technology Solar Telescope |
| AWE | Atmospheric Waves Experiment |
| BARREL | Balloon Array for Radiation-belt Relativistic Electron Losses |
| BATS-R-US | Block-adaptive-tree-solarwind-Roe-Upwind Scheme |
| CCMC | Community Coordinated Modeling Center |
| CCOR | Compact Coronagraph |
| CEDAR | Coupling, Energetics, and Dynamics of Atmospheric Regions |
| CeREs | Compact Radiation Belt Explorer |
| CINDI | Coupled Ion-Neutral Dynamics Investigations |
| CISE | Computer and Information Science & Engineering Directorate (NSF) |
| CISM | Center for Integrated Space Weather Modeling |
| CME | Coronal mass ejection |
| CNS | Division of Computer and Network Systems (NSF) |
| CO-I | co-investigator |
| CONUS | continental United States |
| COSMO | Coronal Solar Magnetism Observatory |
| COSPAR | Committee on Space Research |
| CSSP | Committee on Solar and Space Physics |
| DKIST | Daniel K. Inouye Solar Telescope |
| DMSP | Defense Meteorological Satellite Platform |
| DoD | Department of Defense |
| DOE | Department of Energy |
| DRIVE | Diversify, Realize, Integrate, Venture, Educate |
| DSCOVR | Deep Space Climate Observatory |
| DSFP | Data Science Fellowship Program |
| DYNAMIC | Dynamical Neutral Atmosphere-Ionosphere Coupling (mission) |
| ECCS | Division of Electrical, Communications, and Cyber Systems (NSF) |
| ECIP | Early Career Investigator Program |
| EEC | Division of Engineering Education and Centers (NSF) |
| EELV | Evolved Expendable Launch Vehicles |
| ELFIN | Electron Losses and Fields Investigation (mission) |
| ENG | Directorate for Engineering (NSF) |
| EOT-PACI | Education, Outreach and Training Partnerships for Advanced Computational Infrastructure |
| EOVSA | Expanded Owens Valley Solar Array |
| EPD | Energetic Particle Detector |
| ESA | European Space Agency |
| ESPA | EELV Secondary Payload Adaptor |
| EUV | extreme ultraviolet |
| EUVST | Extreme Ultraviolet High-Throughput Spectroscopic Telescope |
| EZIE | Electrojet Zeeman Imaging Explorer |
| FACA | Federal Advisory Committee Act |
| FASR | Frequency Agile Solar Radiotelescope |
| FAST | Fast Auroral Snapshot Explorer |
| FDSS | Faculty Development in Space Science |
| FINESST | Future Investigators in NASA Earth and Space Science and Technology |
| FY | fiscal year |
| GCM | general circulation model |
| GCR | galactic cosmic ray |
| GDC | Geospace Dynamics Constellation |
| GEM | Geospace Environment Modeling (workshop) |
| GEO | Directorate for Geosciences (NSF) |
| GEO | geostationary Earth orbit |
| GFY | government fiscal year |
| GI | guest investigator |
| GICs | ground-induced currents |
| GITM | Global Ionosphere Thermosphere Model |
| GLE | ground-level event |
| GLIDE | Global Lyman-alpha Imagers of the Dynamic Exosphere |
| GNSS | Global Navigation Satellite Systems |
| GOES | Geostationary Operational Environmental Satellite |
| GOLD | Global Observations of the Limb and Disk |
| GONG | Global Oscillation Network Group |
| GPS | Global Positioning System |
| GS | Geospace Section (NSF) |
| GSFC | Goddard Space Flight Center |
| GSRP | Graduate Student Researchers Program |
| HabEX | Habitable Exoplanet Observatory |
| HAO | High Altitude Observatory |
| HDEE | Heliophysics Data Environment Enhancements |
| HEOMD | Human Exploration and Operations Mission Directorate (NASA) |
| HF | high frequency |
| H-FORT | Heliophysics Flight Opportunities for Research and Technology |
| HGI | Heliophysics guest investigator |
| Hi-C | High Resolution Coronal Imager |
| HIS | Heavy Ion Sensor |
| HMI | Helioseismic and Magnetic Imager |
| HP | Heliophysics |
| HPAC | Heliophysics Advisory Committee |
| HPD | Heliophysics Division (NASA) |
| HSC | Heliophysics Science Centers |
| HSO | Heliophysics System Observatory |
| HSR | Heliophysics Supporting Research |
| H-TIDeS | Heliophysics Technology and Instrument Development for Science |
| IBEX | Interstellar Boundary Explorer |
| ICME | interplanetary coronal mass ejection |
| ICON | Ionospheric Connection Explorer |
| IDS | interdisciplinary scientists |
| IMAGE | Imager for Magnetopause-to-Aurora Global Exploration |
| IMAP | Interstellar Mapping and Acceleration Probe |
| IMF | interplanetary magnetic field |
| INCLUDES | Inclusion across the Nation of Communities of Learners of Underrepresented Discoverers in Engineering and Science |
| IRIS | Interface Region Imaging Spectrograph |
| ISS | International Space Station |
| IT | ionosphere-thermosphere |
| ITD | Instrument and Technology Development |
| ITM | ionosphere-thermosphere-mesosphere |
| JAXA | Japan Aerospace Exploration Agency |
| JHU APL | Johns Hopkins University Applied Physics Laboratory |
| JPL | Jet Propulsion Laboratory |
| JVLA | Jansky Very Large Array |
| JWST | James Webb Space Telescope |
| LASCO | Large Angle and Spectrometric Coronagraph |
| LCAS | Low Cost Access to Space |
| LEO | low Earth orbit |
| LFM | Lyon-Fedder-Mobarry |
| Lidar | light detection and ranging |
| LISM | local interstellar medium |
| LISN | Low-latitude Ionospheric Sensor Network |
| LMSAL | Lockheed Martin Solar and Astrophysics Laboratory |
| LNAPP | Laboratory Nuclear, Atomic, and Plasma Physics |
| LSAMP | Louis Stokes Alliances for Minority Participation Program |
| LST | local standard time |
| LUVOIR | Large Ultraviolet/Optical/Infrared Surveyor |
| LWS | Living With a Star |
| MAG | Magnetospheric Physics (NSF program) |
| MAS/CORHEL | Magnetohydrodynamic Algorithm outside a Sphere/Corona-Heliosphere |
| MAVEN | Mars Atmosphere and Volatile Evolution (mission) |
| MEDICI | Magnetosphere Energetics, Dynamics and Ionospheric Coupling Investigation |
| MERRA | Modern-Era Retrospective analysis for Research and Applications |
| METIS | Multi Element Telescope for Imaging and Spectroscopy |
| MHD | Magnetohydrodynamics |
| MIDEX | Medium-Class Explorer |
| MinXSS | Miniature X-Ray Solar Spectrometer |
| MLSO | Mauna Loa Solar Observatory |
| MMS | Magnetospheric Multiscale Mission |
| MO&DA | Management, Operations, and Data Analysis |
| MOA | Memorandum of Agreement |
| MoO | Mission of Opportunity |
| MOU | Memorandum of Understanding |
| MPS | Directorate for Mathematical and Physical Sciences (NSF) |
| MREFC | Major Research Equipment and Facilities Construction |
| MRO | Mars Reconnaissance Orbiter (mission) |
| MSFC | Marshall Space Flight Center |
| MSL | Mars Science Laboratory |
| NASA | National Aeronautics and Space Administration |
| NASEM | National Academies of Science, Engineering, and Medicine |
| NCAR | National Center for Atmospheric Research |
| NESDiS | National Environmental Satellite, Data, and Information Service |
| NESSF | NASA Earth and Space Science Fellowship |
| NExSS | Nexus for Exoplanet System Science |
| NO | nitric oxide |
| NOAA | National Oceanic and Atmospheric Administration |
| NRC | National Research Council |
| NRL | Naval Research Laboratory |
| NSB | National Science Board |
| NSF | National Science Foundation |
| NSO | National Solar Observatory |
| NSWAP | National Space Weather Action Plan |
| NSWP | National Space Weather Program |
| NSWSAP | National Space Weather Strategy and Action Plan |
| NWSW | National Space Weather Strategic Plan |
| O2R | operations-to-research |
| OIG | Office of the Inspector General |
| OMB | Office of Management and Budget |
| OpenGGCM | Open Geospace General Circulation Model |
| OSS | open-source software |
| OST | Origins Space Telescope |
| PHI | Polarimetric and Helioseismic Imager |
| PI | principal investigator |
| PIC | particle-in-cell |
| POES | Polar-orbiting Operational Environmental Satellite |
| PS | participating scientist |
| PSD | Planetary Science Division (NASA) |
| PSP | Parker Solar Probe |
| PUNCH | Polarimeter to Unify the Corona and Heliosphere |
| R&A | Research and Analysis |
| R2O | research-to-operations |
| RAD | Radiation Assessment Detector |
| RCM | Rice Convection Model |
| RHESSI | Reuven Ramaty High Energy Solar Spectroscopic Imager |
| RI | research infrastructure |
| RINEX | receiver independent exchange |
| ROSES | Research Opportunities in Space and Earth Science |
| SALMON | Stand Alone Missions of Opportunities Notice |
| SAMPEX | Solar, Anomalous, and Magnetospheric Particle Explorer |
| SDO | Solar Dynamics Observatory |
| SDT | science definition team |
| SEM | Space Environment Monitor |
| SEP | solar energetic particles |
| SET | Space Environment Testbeds |
| SETH | Science-Enabling Technologies for Heliophysics |
| SFG | Sum Frequency Generation Spectrometer |
| SHINE | Solar, Heliosphere, and Interplanetary Environment |
| SHP | solar and heliospheric physics |
| SHSW | solar, heliospheric, and space weather |
| SIHLA | Spatial/Spectral Imaging of Heliospheric Lyman Alpha |
| SKG | strategic knowledge gap |
| SMD | Science Mission Directorate (NASA) |
| SMEX | Small Explorer |
| SNOE | Student Nitric Oxide Explorer |
| SO | Solar Orbiter |
| SOC | Solar Orbiter Collaboration |
| SOHO | Solar and Heliophysics Observatory |
| SoloHI | Solar Orbiter Heliospheric Imager |
| SOT | Solar Optical Telescope |
| SPD | Solar Physics Division |
| SPICE | Spectral Imaging of the Coronal Environment |
| SPP | Solar Probe Plus |
| SR&T | supporting research and technology |
| SRO | SmallSats and Rideshare Opportunities |
| SSB | Space Studies Board |
| ST5 | Space Technology 5 (mission) |
| STDT | Science and Technology Definition Team |
| STEREO | Solar Terrestrial Relations Observatory |
| STEVE | Strong Thermal Emission Velocity Enhancement |
| STP | Solar-Terrestrial Probes (NASA program) |
| STR | Solar-Terrestrial Research (NSF program) |
| SunRISE | Sun Radio Interferometer Space Experiment |
| SWARM-EX | Space Weather Atmospheric Reconfigurable Multiscale Experiment |
| SWFO | Space Weather Follow-On |
| SWMI | solar wind-magnetosphere interactions |
| SWO2R | Space Weather Operations-to-Research |
| SWORM | Space Weather Operations, Research, and Mitigation |
| SWPA | Solar Wind Plasma Analyzer |
| SWPC | Space Weather Prediction Center |
| SwRI | Southwest Research Institute |
| SWSS | Space Weather Summer School |
| SWx | space weather |
| SWxSA | Space Weather Science and Application |
| TBEX | Tandem Beacon Experiment |
| TEC | total electron content |
| THEMIS | Time History of Events and Macroscale Interactions during Substorms |
| TIE-GCM | Thermosphere-Ionosphere-Electrodynamics General Circulation Model |
| TIMED | thermosphere ionosphere mesosphere energetics and dynamics |
| TLS | Terahertz Limb Sounder |
| TMC | technical, management, cost |
| TRACE | Transition Region and Coronal Explorer |
| TRACERS | Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites |
| TRL | technology readiness level |
| TWINS | Two Wide-Angle Imaging Neutral-Atom Spectrometers |
| UCAR | University Corporation for Atmospheric Research |
| ULF | ultra low frequency |
| USAF | U.S. Air Force |
| VAP | Van Allen Probes |
| VIIRS | Visible Infrared Imaging Radiometer Suite |
| VISORS | VIrtual Super-resolution Optics with Reconfigurable Swarms |
| WACCM(-x) | Whole Atmosphere Community Climate Model |
| WISPR | Wide-Field Imager for Solar Probe |
| WSA-ENLIL | Wang-Sheeley-Arge-Enlil |
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