National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Data Environment - Restoration of AMPTE/CHEM Data

ROSES ID: NRA-03-OSS-01      Selection Year: 2004      

Program Element: Independent Investigation: LWS

Principal Investigator: Jon Vandegriff

Affiliation(s): Johns Hopkins University Applied Physics Laboratory

Project Member(s):
Steele, Joshua COI JHU/APL
Krimigis, Stamatios M Authorizing Official Johns Hopkins University
Hamilton, Douglas C. Collaborator University of Maryland College Park


The Charge-Energy-Mass spectrometer (CHEM) on NASA s Active Magnetospheric Particle Tracer Explorers Charge Composition Explorer (AMPTE/CCE) mission made detailed measurements at high time resolution of energetic particle populations in the inner magnetosphere. This data contains a wealth of information about the behavior of the magnetosphere and the ring current. In particular, the high time resolution data is useful for studying sub-storm ion injection, as well as details about the relationship between Solar wind changes and magnetospheric response. Yet the high time resolution data for CHEM has never been readily available to the community. We will transition high time resolution CHEM data from its aging VAX/VMS-based storage and put online two new ASCII versions of the entire four and a half year dataset, one version calibrated, one version raw counts. The data will be placed on servers at JHU/APL and will also be archived with documentation in the NSSDC at Goddard. Furthermore, we will make the data available in an existing web-based tool for analyzing energetic particle data (the Mission Independent Data Layer or MIDL; see the web site at Finally we will provide CHEM meta-data to emerging Virtual Observatory (VO) systems. Our comprehensive efforts will permanently restore to the LWS program a valuable dataset on the inner magnetosphere, a region which will soon be receiving increased attention with the launch of the LWS Geospace Storm Probes.


Performance YearReferenceInvestigation TypeActions
1Jon Vandegriff / Johns Hopkins University Applied Physics La...
not set


Performance YearReferenceActions
1Vandegriff, J.; (2006), Restoration of AMPTE/CHEM Data, Ame...

Export to PDF