The Australian Antarctic Data Centre produces various datasets derived from satellite-based estimates of sea ice concentration. These datasets are updated periodically, or by request.
Sea ice extent (maximum latitude of sea ice):
The AADC maintains a collection of general-use environmental data layers, covering physical and biological aspects of the Southern Ocean around Antarctica. Matched layers are also provided for the Arctic. Typical uses for these data might include general modelling, regionalisation, and exploratory analyses.
Metadata on these layers can be found here. The netCDF files also include details about the source data.