Radial Density Profile of the F-Corona and the Power-Law Exponent Test

This paper examines Density exponent inferred from the observed fall-off of F-corona brightness with solar elongation and distance. Using only published input values and transparent formulae, the calculation obtains the following headline results: brightness_power_law_exponent = 2.3; inferred_density_exponent_nu = 1.3; density_at_0_5AU_relative_to_1AU = 2.46; density_at_3AU_relative_to_1AU = 0.24; brightness_at_0_5AU_relative_to_1AU = 4.92; brightness_at_3AU_relative_to_1AU = 0.08. The observed brightness exponent near 2.3 implies a spatial density falling roughly as distance to the power minus 1.3, flatter than the inverse-square profile a drag-only flow would produce. The method, inputs and limitations are stated in full so that any reader can reproduce or rescale every number from the deposited calculation script. Agreement and disagreement with independent published estimates are reported at their actual size, and the conclusions are limited to what the budget arithmetic supports.