A NASA sponsored study conducted at John Hopkins University Applied
Physics Lab culminated in a community-inspired heliospheric mission
concept called the Interstellar Probe (ISP). The ISP’s science goals
include understanding our habitable astrosphere by investigating its
interactions with the interstellar medium, and determining the
structure, composition, and variability of its constituents. A suite of
instruments were proposed to achieve these and other science objectives.
The instruments include a Lyman-a spectrograph for velocity-resolved
measurements of neutral H atoms. The capability to address key
components of the ISP’s science objectives by utilizing high spectral
resolution Lyman-a measurements are described in this presentation.
These findings have been submitted as a community White Paper to the
recent Heliophysics decadal survey.