Technical Summary

• development of the Medium-l Program for basic helioseismological observations using the 5 kbs telemetry channel, which includes development of observational schemes and the pipeline for the data analysis;
• development of the Structure Inversions Pipeline for the determination of the primary seismic properties (the pressure, the density, the sound speed, and the adiabatic exponent) of the spherically symmetric component of the mean structure in and below the convective envelope; for the determination of the same properties of the non-spherically symmetric component in the convective envelope; and for the estimation of the helium abundance in the convection zone using the standard equation of state.