This note explains the access and display capabilities of the interface at http://omniweb.gsfc.nasa.gov/sc_merge_min1.html The underlying data, 1-min averaged ACE, Wind, IMP 8 and Geotail magnetic field and plasma data shifted to a dynamic model bow shock nose location, are explained in a companion file at http://omniweb.gsfc.nasa.gov/html/sc_merge_data1.html. In particular, each of the variables made accessible through this interface is described in detail there.

This interface allows the user to plot or list any subset of parameters for any combination of the four data sets from ACE, Wind, IMP and Geotail, for any time span of interest.

Users must first specify whether they want a plot or listing (or to create a downloadable file, about which a separate discussion is available from the page being described). Users then specify one or more spacecraft, the desired time span to hourly or daily resolution, and finally which variables they want included in the plots or listings.

Values for a given variable, for up to three spacecraft, are plotted in a single panel using differently colored traces. Up to ten variables may be plotted in a given run, with one output panel generated for each variable.

The time span for each plot may be set between one and 24 hours if the desired span is specified to hourly resolution, and between one and 30 days if the desired span is specified to daily resolution. A sequence of plots is generated, in sequence, if the desired time span exceeds the span of one plot.

Note in the "Advanced Plot Selections" section, one may change the common scale from linear to logarithmic, and may otherwise change the look of the output plots.

NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility