  We present a modification of a model of solar cycle evolution of the solar
Lyman-alpha line profile, along with a sensitivity study of interstellar
neutral H hydrogen to uncertainties in radiation pressure level. The line
profile model, originally developed by Kowalska-Leszczynska et al. 2018a, is
parametrized by the composite solar Lyman-alpha flux, which recently was
revised Machol et al. 2019. We present modified parameters of the
previously-developed model of solar radiation pressure for neutral hydrogen and
deuterium atoms in the heliosphere. The mathematical function used in the
model, as well as the fitting procedure, remain unchanged. We show selected
effects of the model modification on ISN H properties in the heliosphere and we
discuss the sensitivity of these quantities to uncertainties in the calibration
of the composite Lyman-alpha series.
