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Table 1.
Summary of the main quantities defined in the paper.
| Quantity | Background | Perturbations |
|---|---|---|
| Intensity Iλ | Iλ0 Eq. (1) | δIλ = δIgeom + δIth + δIline |
| Eqs. (21), (25), and (25) | ||
| HMI filtergrams ℐj (1 ≤ j ≤ 6) | ℐj0 (Eq. (5) with I0λ) | δℐj (Eq. (5) with δIλ) |
| Fourier coefficients a1 and b1 | a10, b10 (Eqs. (7), (8) with ℐj0) | δa1, δb1 (Eqs. (7), (8) with δℐj) |
| Velocity v (before lookup table) | v0 (Eq. (26)) | δv (Eq. (27)) |
| vHMI (corresponding to hmi.V_45s) | vHMI0 (Eq. (29)) | δvHMI (Eq. (30)) |
| =δvgeom + δvth + δvline (from δIgeom, δIth, δIline) | ||
| Line-of-sight flow velocity | vlos0 (Eq. (18) ) | δvlos (approximation at fixed height, Eq. (40)) |
| IHMI (corresponding to hmi.Ic_45s) | IHMI0 (Eq. (12) with ℐj0) | δIHMI (Eq. (36)) |
| Continuum intensity Ic | Ic0 (=Iλ0 for λ in continuum) | δIc (=δIλ for λ in continuum) |
Notes. The perturbed HMI velocity δvHMI is compared to the approximation δvlos, and the HMI continuum δIHMI is compared to the pure continuum δIc.
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