Helioseismology of sunspots: defocusing, folding, and healing of wavefronts

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Table 1

Characteristics of incoming wave packets.

Modes	n	ν	λ	R/λ	x _F
		(mHz)	(Mm)		(Mm)

f	0	2.6	6.3	3.2	126.2
p ₁	1	2.9	8.3	2.4	95.3
p ₂	2	3.1	10.7	1.9	73.4
p ₃	3	3.4	13.1	1.5	59.4
p ₄	4	3.6	14.8	1.4	52.2

Notes. A wave packet consists of waves with the same radial order n (ridge filtering). The quantity x_F is the distance from the sunspot such that the sunspot fills the first Fresnel zone of the scattered wave packet. See Fig. 2 and Sect. 4.

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