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E Select Acronyms and Terms ACE Advanced Composition Explorer AFSPC Air Force Space Command (headquartered at Peterson Air Force Base Colorado) AFWA Air Force Weather Agency CCMC Community Coordinated Modeling Center (a NASA-supported program) CME coronal mass ejection COST Cooperation in Science and Technology CRRES Combined Release and Radiation Effects Satellite DOD Department of Defense Dst distributed storage time ESA European Space Agency EU European Union FAA Federal Aviation Administration GIC geomagnetically induced current GOES Geostationary Operational Environment Satellite GPS Global Positioning System HF high frequency (3-30 MHz) JSpOC Joint Space Operations Center Kp index A planetary index of geomagnetic activity that ranges from Kp0 to Kp9 where Kp9 represents the most severe storm LF/HC low-frequency/high-consequence LRO Lunar Reconnaissance Orbiter (NASA Space Exploration Mission) LWS Living With a Star (NASA program) NSF National Science Foundation now-cast near-term space weather forecast NSWP National Space Weather Program PCA polar cap absorption R&D research and development RF radio frequency SA situational awareness 130

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APPENDIX E 131 SDO Solar Dynamics Observatory SEC Space Environment Center SEP solar energetic particle SOHO Solar and Heliospheric Observatory STEREO Solar-Terrestrial Relations Observatory SWENET Space Weather European Network SWPC Space Weather Prediction Center (NOAA) SWWT Space Weather Working Team TEC total electron content USAF U.S. Air Force USGS U.S. Geological Survey WAAS Wide Area Augmentation System

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