Third Workshop and Tutorial on Practical Use of Coloured Petri Nets and the CPN Tools, Aarhus, Denmark, August 29-31, 2001

In time-distance helioseismology most inversion procedures ignore the correlations in the data errors. Here we simulate the travel-time perturbations of wavepackets that result from known distributions of sound speed inhomogeneities. The forward and inverse problems are carried out using recently developed Born approximation sensitivity kernels. A realistic solar noise component, with the correct statistics, is added to the data. We then apply a three-dimensional inversion procedure based on an improved multichannel deconvolution algorithm that includes the full covariance matrix of the simulated data and constrains the solution both in the vertical and horizontal directions. The validation of the inversion is achieved through comparison of the inferred sound speed distributions with the exact solutions. We show that including the covariance matrix matters for sound speed inhomogeneities varying on a length scale smaller than the correlation length. We also find that the inversion procedure is improved by adding horizontal regularization.

show abstract

“…In order to formulate the problem in Fourier space we introduce the following vectors (Jensen 2001):…”

Section: Algorithm With Horizontal Regularizationmentioning

confidence: 99%

Time‐Distance Helioseismology: Inversion of Noisy Correlated Data

Couvidat

Gizon

Birch

et al. 2005

ASTROPHYS J SUPPL S

View full text Add to dashboard Cite

show abstract

“…Для построения интегрированных ИС используются объектно-ориентированные технологии [3][4][5], метамоделирование систем [6,7], облачные технологии [8][9][10], архитектурные решения на основе единой шины данных [11][12][13][14]. При перенастройке интегрированной ИС под изменившиеся условия ее эксплуата-ции возникают проблемы согласования форматов передачи данных, идентификации информационных объектов [5], сохранении информационных ресурсов в интегрированной базе или хранилище данных, интеграции нового приложения в ИС [15,16].…”

Section: Introductionunclassified