Browsing by Subject "Helioseismology"

Now showing items 21-23 of 23

A study of acoustic halos in active region NOAA 11330 using multi-height SDO observations

Tripathy, S. C; Jain, K; Kholikov, S; Hill, F; Rajaguru, S. P; Cally, P. S (Elsevier B.V, 2018-01)

We analyze data from the Helioseismic Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) instruments on board the Solar Dynamics Observatory (SDO) to characterize the spatio-temporal acoustic power distribution ...
Testing the helioseismic determination of opacity corrections

Tripathy, S. C; Christensen-Dalsgaard, J (Astronomical Society of India, 1998)

We investigate the effect of localized opacity modifications on the sound-speed profile of solar models. The sound-speed difference between the Sun and a solar model is used to deduce the opacity correction that would be ...
Zonal velocity bands and the solar activity cycle

Sivaraman, K. R; Antia, H. M; Chitre, S. M; Makarova, V. V (Springer Netherlands, 2008-09)

We compare the zonal-flow pattern in subsurface layers of the Sun with the distribution of surface magnetic features such as sunspots and polar faculae. We demonstrate that, in the activity belt, the butterfly pattern of ...

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