Heliospheric Data Access Through, and Functionalities of, GSFC/SPDF's OMNIWeb, COHOWeb and FTPBrowser

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2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma, 2199 General Or Miscellaneous

Scientific paper

OMNIWeb provides access to hourly resolution near-Earth solar wind magnetic field and plasma data for 1963 to near-current. Cross-normalized data from each of many spacecraft are used. Very recently, OMNIWeb began providing access to 1-min and 5-min versions of OMNI data for 1995 to near-current, based on ACE, Wind and IMP 8 data shifted to the Earth's bow shock nose by a combination of minimum variance and cross product techniques applied to ~15-s magnetic field data. The spacecraft-specific 1-min data are also OMNIWeb- accessible. COHOWeb provides access to hourly resolution solar wind magnetic field and plasma data from each of many deep space spacecraft (Voyagers, Pioneers, Ulysses, Helios) and to the OMNI data near Earth. Data have been uniformized in content, format and coordinate system usage. FTPBrowser provides access to many tens of higher resolution heliospheric magnetic field, plasma and energetic particle data sets. These interfaces provide baseline functionalities of time span selection and subsetting by physical parameter, with plot, list and file creation options. In addition, many data sets also have scatter plot, linear regression fitting and cross correlation coefficient (CCC) determination capabilities, while some have distribution function and statistics (means, medians, etc.) capabilities. For the latter two, filtering by any parameters in the records enables study of dependences of CCF's, means, etc. on other variables. VxO's have the options of identifying and/or otherwise exploiting these value-added interfaces in response to relevant user queries and of identifying and possibly retrieving the corresponding FTP-accessible ASCII files.

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