LASCO Solar Radius

There are several ways solar radius is computed for SOHO. The most accurate is using sohoephem.pro. This uses compiled fortran libraries which compute a number of astronomical parameters. However, some platforms are not supported. An estimate of solar radius which is accurate to within 1.5 arcsec is computed by solar_ephem.pro. This what is used in wscc_mkmovie.pro and related software. Below is an example of the evolution of the error over 1 year:
nr, 2010/12/01