منابع مشابه
Noise reduction in helioseismic power spectra by non-orthogonal wavelets
We present a method to reduce noise in helioseismic power spectra using a non-orthogonal wavelet transform based on quadratic spline functions. The quality of our method is tested by applying it to artificially generated time-series approximating solar p-modes. The mode frequencies and line widths obtained from leastsquares fits to the smoothed spectra are compared with the corresponding parame...
متن کاملHelioseismic data inclusion in solar dynamo models
An essential ingredient in kinematic dynamo models of the solar cycle is the internal velocity field within the simulation domain – the solar convection zone. In the last decade or so, the field of helioseismology has revolutionized our understanding of this velocity field. In particular, the internal differential rotation of the Sun is now fairly well constrained by helioseismic observations a...
متن کاملEfficient pseudo-global fitting for helioseismic data
Mode fitting or “peak-bagging” is an important procedure in helioseismology allowing one to determine the various mode parameters of solar oscillations. Here we describe a way of reducing the systematic bias in the fits of certain mode parameters that are seen when using “local” fitting techniques to analyse the sun-as-a-star p-mode power spectrum. To do this we have developed a new “pseudo-glo...
متن کاملHelioseismic Data Assimilation in Solar Dynamo Models
An essential ingredient in kinematic dynamo models of the solar cycle is the internal velocity field within the simulation domain – the solar convection zone. In the last decade or so, the field of helioseismology has revolutionized our understanding of this velocity field. In particular, the internal differential rotation of the Sun is now fairly well constrained by helioseismic observations a...
متن کاملPseudo - global Fitting of Gapped Helioseismic Data Stephen Fletcher
Mode fitting or “peak-bagging” is an important procedure in helioseismology allowing one to determine the various mode parameters of solar oscillations. We have recently developed a new “pseudo-global” fitting algorithm as a way of reducing the systematic bias in the fits of certain mode parameters that are seen when using “local” fitting techniques to analyse “sun-as-a-star” p-mode data. This ...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1998
ISSN: 0074-1809
DOI: 10.1017/s0074180900238187