Table 1
Var [ τ1τ2 ] and Var [ ⟨ τ1τ2 ⟩ A ] (in s4) with l = 18 Mm for the product of a EW and NS travel time (configuration #2 with d = 0).
| Var(τxτy) | Var( ⟨ τxτy ⟩ A′) | |
| (s2) | (s4) | |
|
|
||
| SDO/HMI observations | 5.7 × 106 | 6.2 × 104 |
| Monte Carlo simulations | 5.4 × 106 | 5.0 × 104 |
| Analytic formula | 5.4 × 106 | 5.0 × 104 |
Notes. Comparison of SDO/HMI observations, analytic formula and Monte Carlo simulations for a p1-ridge at 40° latitude and for an observation time T = 8 h.
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