OMNIWeb allows users to generate plots vs. ( /o w.html ) that provides access to the entire OMNI data set. We will also present some of the many capabilities of the OMNIweb interface This presentation will describe the OMNI data set and highlight its wide use in the space science community. Extensive quality control and cross- comparisons of overlapping data sets were made in creating OMNI. The data from ISEE-3, Wind, and ACE were time-shifted because they are about an hour upstream of the Earth's magnetosphere. Spacecraft data used for compiling the OMNI solar wind reference include IMP-8, ACE, Wind, ISEE-3, and Geotail. OMNI provides the IMF (magnitude and vector), flow velocity (magnitude and vector), flow pressure, proton density, alpha particle to proton density ratio, and several additional parameters including sunspot and geomagnetic indices and energetic proton fluxes from IMP and GOES. OMNI is widely used in the heliospheric community as is documented by the large number of acknowledgements in scientific papers. OMNI is an hourly resolution multi-source data set of near-Earth solar wind's magnetic field and plasma parameters spanning the period from November 1963 (IMP 1 launch) to today, and it is being updated regularly with new data. Additionally, this interface provides solar wind input data for studies of solar wind - magnetosphere coupling. The OMNIWeb interface provides access to this data set with graphical browse and subsetting capability, to ftp-accessible annual ASCII OMNI files, and to higher resolution data sets contributing to OMNI. The data set was created at NSSDC by interspersing, after cross-normalizing, field and plasma data from each of several spacecraft. The OMNI data set is an hourly-resolution 1963-near_current data set with near-Earth solar wind magnetic field and plasma data, solar and geomagnetic activity indices, and energetic particle flux data.
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