C
Acronyms and Abbreviations
ACE
Advanced Composition Explorer
ACR
anomalous cosmic ray
AU
astronomical unit—mean distance of Earth from the Sun
CCD
charge-coupled device
CIR
co-rotating interaction region
DOE
Department of Energy
ENA
energetic neutral atom
EUV
extreme ultraviolet
GAS
Ulysses Interstellar Neutral Gas Experiment
GCR
galactic cosmic ray
GMIR
global merged interaction region
HST
Hubble Space Telescope
IBEX
Interstellar Boundary Explorer
IMAGE
Imager for Magnetosphere to Aurora Global Exploration
IMF
interplanetary magnetic field
JIMO
Jupiter Icy Moons Orbiter
LENA
Low-Energy Neutral Atom
LIC
local interstellar cloud
LISM
local interstellar medium
MHD
magnetohydrodynamic
MIDEX
Medium-Class Explorer
NASA
National Aeronautics and Space Administration
NEP
nuclear-electric propulsion
NRC
National Research Council
OSS
Office of Space Science
PASO
Particle Acceleration Solar Orbiter
SEC
Sun-Earth Connection
SMEX
Small Explorer
SOHO
Solar and Heliospheric Observatory
SWAN
Solar Wind Anisotropies
SWICS
Solar Wind Ionic Composition Spectrometer
SWIMS
Solar Wind Ion Mass Spectrometer
TWINS
Two Wide-Angle Imaging Neutral-Atom Spectrometers
