title: Comment on "Detection of emerging sunspot regions in the solar interior".
abstract: Ilonidis et al. (Reports, 19 August 2011, p. 993) report acoustic travel-time decreases associated with emerging sunspot regions before their appearance on the solar surface. An independent analysis using helioseismic holography does not confirm these travel-time anomalies for the four regions illustrated by Ilonidis et al. This negative finding is consistent with expectations based on current emerging flux models.
authors.affiliation: NorthWest Research Associates, 3380 Mitchell Lane, Boulder, CO 80301, USA. dbraun@cora.nwra.com
authors.forename: Douglas C
authors.initials: DC
authors.lastname: Braun