Influence of Heliolatitudinal Anisotropy of Solar FUV/EUV Emissions on Ly? Helioglow: SOHO/SWAN Observations and WawHelioGlow Modeling

Observations of the Sun's surface suggest a nonuniform radiated flux as related to presence bright active regions and darker coronal holes. The variations FUV/EUV source radiation can be expected affect Lyman-alpha backscatter glow measured by spaceborne instruments. In particular, inferring heliolatitudinal structure solar wind from helioglow in sky quite challenging if is not properly included modeling heliospheric glow. We present results analysis inferred comparison SOHO/SWAN satellite observations intensity with obtained recently-developed WawHelioGlow model. find that addition time-dependent anisotropy wind, also photoionizing emissions must taken into account reproduce observed modulation sky. particular latitudinal temporal dependence result our analysis. analyze differences between polar-equatorial anisotropies close seen an observer located far Sun. discuss implications these findings for interpretation heliospheric-glow observations.