Supergranulation velocity field from the MDI (SOHO) data
نویسندگان
چکیده
منابع مشابه
Determination of the Sun's Seismic Radius from SOHO/MDI
Dopplergrams from the Michelson Doppler Imager (MDI) instrument on board the SOHO spacecraft have been used to accurately measure frequencies of the Sun's fundamental (f) mode in the medium angular degree range, l = 88 ? 250. The comparison of these frequencies with the corresponding frequencies of the standard solar models suggests that the apparent photospheric solar radius (695.99 Mm) used t...
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Large-scale simulations of solar turbulent convection produce realistic data and provide a unique opportunity to study solar oscillations and test various techniques commonly used for the analysis of solar observations. We applied helioseismic methods to the sets of simulated as well as observed data and find remarkable similarities. Power spectra, k − ν diagrams, timedistance diagrams exhibit ...
متن کاملSpectrum of a random f -mode and the SOHO/MDI data
According to the SOHO/MDI observations (Duvall et al. 1998, Antia & Basu 1999) the solar f-mode frequency departs from the parabolic dispersion relation ω2 = gk. We propose to explain this behaviour in terms of a spaceand timedependent random flow that occurs in the convection zone. A time-dependent random flow speeds up the f-mode while the effect of a space-dependent random flow is to slow it...
متن کاملLocal helioseismology and correlation tracking analysis of surface structures in realistic simulations of solar convection
We apply time-distance helioseismology, local correlation tracking and Fourier spatial-temporal filtering methods to realistic supergranule scale simulations of solar convection and compare the results with high-resolution observations from the SOHO Michelson Doppler Imager (MDI). Our objective is to investigate the surface and sub-surface convective structures and test helioseismic measurement...
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ژورنال
عنوان ژورنال: Geomagnetism and Aeronomy
سال: 2014
ISSN: 0016-7932,1555-645X
DOI: 10.1134/s0016793214080143