The workshop from which these papers have been gathered targeted the low latitude ionosphere. Emphasis is placed on modelling and mapping, on computer simulations, use of specialized data sources and validation and comparison. An important aspect is the assessment of total electron content with data from a number of satellites including the Navy Navigation Satellite System (NNSS), Fleetsat and ETS. Data from low latitude ionosondes including several digisondes operating at low latitudes is also covered.