THE COUPLING BETWEEN SOLAR FORCING VARIABILITY AND THE UPPER ATMOSPHERE HAS IMPORTANT IMPACTS ON THE EARTH S CLIMATE SYSTEM. ONE OF THE MOST EFFECTIVE COUPLING MECHANISMS IS ENERGETIC PARTICLE PRECIPITATION (EPP) BY WHICH THE SUN CAN DISTURB THE ATMOSPHERE PHOTOCHEMICALLY AND THERMODYNAMICALLY. THE IONIZATION FROM EPP CAN PRODUCE AN ENHANCED NOX ABUNDANCE IN THE MESOSPHERE AND THERMOSPHERE CALLED EPP-NOX THAT IS SUBSEQUENTLY TRANSPORTED DOWN TO THE STRATOSPHERE TO FURTHER REACT WITH THE STRATOSPHERIC OZONE. THIS PROCESS IS CALLED AN INDIRECT EFFECT OF EPP (EPP-IE). RECENT STUDIES HAVE SHOWN THAT EPP-IE CAN FURTHER IMPACT THE TROPOSPHERE BY A CHEMICAL-DYNAMICAL COUPLING IN THE POLAR REGION. STRENGTH OF EPP-IE IS CONTROLLED BY BOTH THE MAGNITUDE OF GEOMAGNETIC ACTIVITIES (PRODUCTION OF EPP-NOX) AND THE STRENGTH OF DOWNWARD TRANSPORT OF EPP-NOX. GRAVITY WAVES (GWS) ARE A MAJOR DYNAMICAL FORCE DRIVING THE DOWNWARD TRANSPORT OF EPP-NOX. BECAUSE SMALL-SCALE GWS ARE HARD TO SIMULATE AND OBSERVE FROM SPACE THE RELATIVE IMPORTANCE OF ATMOSPHERIC WAVES WITH RESPECT TO SOLAR VARIABILITY IMPACTS ON CHEMICAL SPECIES REMAIN UNCLEAR AND REQUIRES A THOROUGH AND QUANTITATIVE ANALYSIS. RECENTLY IMPROVED SATELLITE GW OBSERVATIONS BEGIN TO PROVIDE GLOBAL GW CHARACTERISTICS FROM THE STRATOSPHERE TO THE LOWER THERMOSPHERE. COMBINATIONS OF MULTIPLE GW GLOBAL SATELLITE OBSERVATIONS COVER A WIDE RANGE OF GEOPHYSICAL LOCATIONS ALTITUDES AND A LARGE PROPORTION OF GW SPECTRUM. UTILIZING THE RICH SATELLITE OBSERVATIONS OF GWS AND CHEMICAL SPECIES THIS WORK AIMS TO BETTER UNDERSTAND (1) ROLES OF GWS ON EPP-IE (2) RELATIVE IMPORTANCE OF GWS ON EPP-IE COMPARED TO THE MAGNITUDE OF GEOMAGNETIC ACTIVITIES AND PLANETARY WAVES (PWS) AND (3) SEASONAL AND HEMISPHERIC VARIATIONS OF GW INFLUENCES ON EPP-IE. THE FINDINGS FROM THESE INVESTIGATIONS PROVIDE THE NEEDED OBSERVATIONAL CONSTRAINT ON THE SUN-CLIMATE COUPLING AND WILL YIELD A QUANTITATIVE DESCRIPTION ABOUT THE SOLAR EPP IMPACTS ON THE EARTH ATMOSPHERE. FOR THE PROPOSED WORK MAJORITY OF DATA WILL BE OBTAINED FROM THE TIMED-SABER AND AIM-SOFIE INSTRUMENTS FROM HELIOPHYSICS PROJECTS. IN ADDITION TO THAT AQUA-AIRS (ATMOSPHERIC INFRARED SOUNDER) OBSERVATIONS FROM NASA'S EARTH OBSERVING SYSTEM AND ACE (ATMOSPHERIC CHEMISTRY EXPERIMENT) SATELLITE DATA WILL BE ALSO USED. TO SUPPLEMENT OBSERVATIONAL STUDY TIME-GCM (THERMOSPHERE-IONOSPHERE-MEOSPHERE-ELECTRODINACIS GENERAL CIRCULATION MODEL) WILL BE USED TO CONDUCT SENSITIVITY STUDY OF EPPIE MECHANISMS. TO ACHIEVE THE PROJECT OBJECTIVE WE WILL FIRST DEVELOP DATABASES OF GWS PWS AND CHEMICAL SPECIES. JOINT ANALYSES OF THREE SATELLITE OBSERVATIONS WILL BE CONDUCTED TO COVER WIDE RANGES OF GW SPECTRUM AND LATITUDES. SECONDLY WE WILL EVALUATE THE CORRELATIONS BETWEEN GWS AND CHEMICAL SPECIES VARIATIONS UNDER VARIOUS SOLAR AND TERRESTRIAL DISTURBING CONDITIONS SUCH AS GEOMAGNETIC ACTIVITIES THE 11-YEAR SOLAR CYCLE AND PW ACTIVITIES. FINALLY MECHANISMS OF EPP-IE AND IMPORTANCE OF GWS ON EPP-IE COMPARED TO LARGE-SCALE PWS AND SOLAR CONDITIONS WILL BE EXAMINED USING BOTH SATELLITE DATA AND ALSO SENSITIVITY STUDY USING TIEMGCM. THE PROPOSED WORK USES CURRENTLY OPERATING MISSIONS OF THE HELIOPHYSICS SYSTEM OBSERVATORY (HSO) TIMED/SABER AND AIM/ SOFIE. THIS PROPOSED WORK DIRECTLY FITS ONE OF THE GOALS OF NASA HELIOPHYSICS DECADAL SURVEY DETERMINE THE DYNAMICS AND COUPLING OF EARTH S MAGNETOSPHERE IONOSPHERE AND ATMOSPHERE AND THEIR RESPONSE TO SOLAR AND TERRESTRIAL INPUTS.