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Table 2

Comparison of beam kinematics for different density models.

Model Altitude shift (R) Beam displ. (Mm) Beam speed (c)
start end F R F R

TCD 0.59 0.47 170 112 0.18 0.14
Saito 0.53 0.39 218 132 0.22 0.17
Leblanc 0.38 0.25 202 123 0.2 0.16
Newirk 0.74 0.57 286 141 0.28 0.18
Mann 0.35 0.25 165 90 0.26 0.17
B-A* 0.56 0.41 261 128 0.16 0.12

Notes. All quoted values are mean values. The beam displacements are shown for forward (F) and reverse (R) drifters separately. As expected, the values differ among the different models. However, the general results are unaffected by a change of density model.

(†)

Only valid if the shift in frequency of the backbone is interpreted as an actual source altitude shift.

(*)

Baumbach-Allen.

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