( ( To ( ( investigate ( ( the coupling ) ( between ( ( ( the thermosphere ) and ) ( the ( middle atmosphere ) ) ) ) ) ) ( through ( ( the influence ) ( of ( energetic particles ) ) ) ) ) ) . )
(ROOT (S (VP (TO To) (VP (VB investigate) (NP (NP (DT the) (NN coupling)) (PP (IN between) (NP (NP (DT the) (NN thermosphere)) (CC and) (NP (DT the) (JJ middle) (NN atmosphere))))) (PP (IN through) (NP (NP (DT the) (NN influence)) (PP (IN of) (NP (JJ energetic) (NNS particles))))))) (. .)))
To investigate the coupling between the thermosphere and the middle atmosphere through the influence of energetic particles.
(ROOT (S (NP (NNP Thermosphere)) (VP (VBZ is) (NP (DT the) (JJ upper-most) (NN atmosphere))) (. .)))