New Public Analysis Environment for Galileo EPD Data

Details New Public Analysis Environment for Galileo EPD Data New Public Analysis Environment for Galileo EPD Data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23b1621b&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23B-1621

Other

[1910] Informatics / Data Assimilation, Integration And Fusion, [1976] Informatics / Software Tools And Services, [6220] Planetary Sciences: Solar System Objects / Jupiter

Scientific paper

We will describe newly available Web-based software for accessing and analyzing the Galileo Energetic Particles Detector (EPD) data. The Galileo spacecraft made extensive measurements of the Jovian system beginning in 1995 and ending with Jupiter impact in 2003. EPD detected ions and electrons from the tens of keV to tens of MeV energy range, all with excellent pitch angle sampling. Ion composition was measured over a portion of the full energy range. EPD had two sampling modes: the so-called real time mode used for most of the mission and the record mode. This latter mode was used almost exclusively to obtain high time resolution data near the inner satellites of Jupiter. EPD data analysis and publications have covered a wide range of topics including the structure and dynamics of Jupiter’s magnetosphere, aurora, satellites, etc. These data will be highly relevant in preparation for NASA’s future flagship mission to Europa and ESA’s possible mission to Ganymede. Previously EPD data were available almost exclusively through the Planetary Data System (PDS) and to the instrument team through IDL-based software. We believe these modes have functioned very satisfactorily for users. However, at the same time, we have been developing a Web-based system that is very flexible for users and performs some functions, including pitch angle and quartile filtering and time weighting and binning, that are not available in the PDS. We have adapted this new Web-based software, MIDL, for the Galileo EPD data. MIDL allows the user to render the data in many different formats. For example, the user can look at color spectrograms of particle intensity as a function of the spacecraft position (in time, planetary radius, L, local time, etc.) and energy. The program allows the user to obtain ASCII versions of the plots as well for easy transfer to other analysis environments. While this tool is extremely easy to use, instructions are also provided. In this presentation, we will describe how users can use MIDL from their computers and begin looking at the Galileo EPD data.

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