Radial velocity at r = 2 R_⊙ for two different simulations where the photospheric density is varied. Panel a: radial velocity taken at t = 40.6 min for the simulation previously described where ρ_ph = 2 × 10⁻¹⁶ g cm³. Panel b: radial velocity from a second simulation at the later time of t = 112.5 min, where the photospheric density has increased by an order magnitude ρ_ph = 2 × 10⁻¹⁵ g cm³. The red circle represents the solar disk which is visible at Earth. Red (blue) corresponds to positive (negative) velocities which are saturated at ±1000 km s⁻¹.