The adjoint method applied to time-distance helioseismology

Details The adjoint method applied to time-distance helioseismology The adjoint method applied to time-distance helioseismology

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh51b2002h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH51B-2002

Statistics

Computation

[7290] Seismology / Computational Seismology, [7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, Data Assimilation

Scientific paper

For a given misfit function, a specified optimality measure of a model, its gradient describes the manner in which one may alter properties of the system to march towards a stationary point. The adjoint method, arising from partial-differential-equation-constrained optimization, describes a means of extracting derivatives of a misfit function with respect to model parameters through finite computation. It relies on the accurate calculation of wavefields that are driven by two types of sources, namely the average wave-excitation spectrum, resulting in the forward wavefield, and differences between predictions and observations, resulting in an adjoint wavefield. All sensitivity kernels relevant to a given measurement emerge directly from the evaluation of an interaction integral involving these wavefields. The technique facilitates computation of sensitivity kernels relative to three-dimensional heterogeneous background models with magnetic fields, thereby paving the way for non-linear iterative inversions. We present flow, sound-speed and magnetic-field kernels.

Affiliated with

Also associated with

No associations

Rating

The adjoint method applied to time-distance helioseismology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The adjoint method applied to time-distance helioseismology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The adjoint method applied to time-distance helioseismology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-880961