Abstract
AbstractWe present the rationale for having accurate nowcast and forecast ionospheric conditions, and a brief overview of recent work on assimilation of ionospheric measurements in physics‐based models. This manuscript describes the results of a project aimed at generating accurate operational specifications of ionospheric electron content by the assimilation of Global Positioning System (GPS) ionospheric measurements in a relatively complex first‐principles forecast model. We describe: the overall design of the model, the implemented sequential data assimilation scheme, the specifics of GPS data processing, and the on‐line scheme for estimation of instrumental biases inherent in GPS measurements of ionospheric electron content. Performance of the designed ionospheric specification system is illustrated via common statistical tests, comparisons with data withheld from the assimilation process and comparisons with independent non‐GPS measurements. Web‐based access to the system results is provided athttp://fusionnumerics.com/ionosphere. Copyright © 2005 Royal Meteorological Society
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