Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm12a..03m&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM12A-03
Physics
2721 Field-Aligned Currents And Current Systems (2409), 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2790 Substorms, 2794 Instruments And Techniques
Scientific paper
Few spacecraft are present in near-earth space at any one time. As a consequence it is usually impossible to be certain that the onset of a disturbance seen in space is the beginning of an event or just the time at which the disturbance arrives at the spacecraft. To compensate for this problem large arrays of ground magnetometers and all sky cameras have been deployed over large geographic areas. The assumption is that there are a sufficient number of instruments that the location and time the event begins can be accurately determined, and that this information can be mapped to the equatorial plane of the magnetosphere and associated with the spacecraft observations. Because the instruments are installed and maintained by different institutions numerous problems are encountered in the analysis of the data. These include different formats of the raw and calibrated data; different policies regarding the size of files (granules); the time resolution of data and how they are related to the UTC clock; how missing data are represented; whether missing granules are present in the directory. To deal with these issues we have adopted a policy of transforming all data to the same coordinate system, interpolating the data to a uniform time grid, introducing missing data flags where necessary, creating missing granules with all data except time flagged, and writing these data to a binary flat file. Event data is then read into analysis program for any specific interval by calculating the byte location of the data in the file. This process is much faster than sequential access to text files and greatly simplifies the problem of data buffering across granule boundaries. In this talk we illustrate our approach using data from a number of arrays operated by various institutions during the Themis mission. We will show how Pi 2 pulsations and substorm current wedge perturbations recorded at these different stations can be use to localize a substorm disturbance in time and space.
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