GCR

galactic cosmic ray

GeV

gigaelectronvolt (unit of energy = 1,000 MeV)

GOES

Geostationary Operational Environmental Satellites (NOAA)

GSFC

Goddard Space Flight Center

Gy

gray (unit of radiation)


HESSI

High Energy Spectroscopic Imager (NASA research spacecraft)

HRE

highly relativistic electron

HZE

high z energetic particle, i.e., high-atomic-number particle


IMEX

Inner Magnetospheric Explorer

IMF

interplanetary magnetic field

IMP

Interplanetary Monitoring Program

ISS

International Space Station

ISTP

International Solar-Terrestrial Physics (a NASA program)


JPL

Jet Propulsion Laboratory

JSC

Johnson Space Center (the NASA center responsible for ISS and shuttle operations)


Kp

index of geomagnetic activity


L1

First Lagrangian point. Lagrangian points are points between two orbiting masses in which the gravitational pulls from both bodies are balanced exactly with the centripetal force required to rotate with them. Objects at these points then orbit at a constant distance from both masses.

LASCO

Large Angle and Spectrometic Coronagraph Experiment

LEM

lunar excursion module

LEO

low earth orbit, referring to a class of satellites


MCC

Mission Control Center

MeV

million electron volts (unit of energy)

MHD

magnetohydrodynamic

MSC

Manned Spacecraft Center

MSFC

Marshall Space Flight Center


NASA

National Aeronautics and Space Administration

NCRP

National Council on Radiation Protection and Measurements

NOAA

National Oceanic and Atmospheric Administration

NRA

NASA Research Announcement

NSF

National Science Foundation

NSSDC

National Space Science Data Center, located at GSFC

NSWP

National Space Weather Program


OTTI

Orbiting Technology Testbed Initiative (program within SEE)


POES

Polar-Orbiting Operational Environmental Satellites (NOAA)

POLAR

a high-altitude, polar-orbiting research satellite (NASA)


RBE

relative biological effectiveness

RPC

Rapid Prototyping Center at SEC and AFRL for expediting the transitioning of research into operations



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