INTRODUCTION
1. High-energy Spectra as Photochemical Atmospheric Model Inputs
2. Variability on Timescales of Minutes-to-Hours: Atmospheric Abundances
3. The MUSCLES Treasury Survey: An Energetic Radiation Survey of Exoplanetary Hosts
MOTIVATION: THE IMPORTANCE OF HIGH-SENSITIVITY, SPECTRALLY RESOLVED DATA FOR ATMOSPHERIC MODELING
TARGETS AND OBSERVING PROGRAM
1. MUSCLES Target Stars
2. MUSCLES Observing Strategy
RESULTS: 5 A TO 5 μM IRRADIANCE SPECTRA
1. Broadband Fluxes
2. The Correlation Between C IV and Mg II Fluxes and Broadband Luminosities
3. Temporally Resolved Spectra and Energetic Flares
DISCUSSION
1. Chromospheric and Transition Region Activity of GJ 1214: On, Off, or Variable?
2. Comparison of UV Observations to Coronal Models
3. Star-Planet Interactions Observed in Transition Region Emission Lines
SUMMARY