Waves and oscillations have been observed in the Sun's atmosphere for over half a century.
While such phenomena have readily been observed across the entire electromagnetic …

We review the current status of local helioseismology, covering both theoretical and
observational results. After a brief introduction to solar oscillations and wave propagation …

We describe the defining observations of the solar cycle that provide constraints for the
dynamo processes operating within the Sun. Specifically, we report on the following topics …

Data obtained by the GONG and MDI instruments over the last 7 years are used to study
how solar dynamics—both rotation and other large scale flows—has changed with time. In …

We measure differences in structure between active and quiet regions of the Sun using the
frequencies of high-degree modes determined from ring-diagram analyses. We find that …

We use the ring-diagram technique of local helioseismology to study the amplitude and line
width of high-degree solar acoustic modes from 474 days of data from the Michelson …

The Sun's internal structure and dynamics can be studied with helioseismology, which uses
the Sun's natural acoustic oscillations to build up a profile of the solar interior. We discuss …

We examine continuous measurements of the high-degree acoustic mode frequencies of the
Sun covering the period from 2001 July to 2014 June. These are obtained through the ring …

Helioseismic measurements stretching back for about three decades have clearly shown
that the acoustic modes are sensitive to solar-cycle changes. 2006 marks the first full 11 …

We analyze the variations in the near-surface profiles of sound speed and adiabatic
constant between active regions and neighboring quiet-Sun areas using the technique of …