IMP 15-s Magnetometer Data Added to CDAWeb

Volume 16, Number 1, March 2000


By Joseph King, Kent Hills, and Muriel Taylor


The Interplanetary Monitoring Platform (IMP) 8 magnetometer, now in its twenty-seventh year of in-space operation, has produced the most often and widely used data in the history of space physics. At hourly resolution it has been the chief contributor of interplanetary magnetic field data to NSSDC's 1963-2000 OMNI data set. At 15-s resolution it has long been the NSSDC/NASA Data Archive and Distribution System (NDADS)-resident data set most often downloaded by space physicists.

While a 1-min resolution "key parameter" version of this data set has been created for the International Solar-Terrestrial Physics (ISTP) era (> 1991) and made accessible through the CDAWeb system, NSSDC (with the Space Physics Data Facility [SPDF]) is now creating a Common Data Format (CDF) version of the definitive 15-s data set for making these data accessible through the CDAWeb system. This effort will first load ISTP era data to CDAWeb, and then will load the 1973-1991 part of the data set to CDAWeb. NSSDC anticipates that this effort will be completed, or nearly so, by the distribution date of this newsletter.

CDAWeb has been primarily intended to support analysis of ISTP-era data and is accessible at http://cdaweb.gsfc.nasa.gov/cdaweb/sp_phys/. CDAWeb enables graphic display and retrieval of ASCII files subsetted by time span and by parameters within the data records. CDAWeb currently provides access to 164 "data sets" from 29 spacecraft or other data sources. Inclusion of the pre-ISTP IMP magnetometer marks the desire of NSSDC and SPDF to extend CDAWeb functionality well beyond its ISTP origin.

The IMP 8 magnetometer was provided by Goddard Space Flight Center's Laboratory for Extraterrestrial Physics. Dr. Norman Ness was the original principal investigator. Dr. Ronald Lepping has played that role for most of the long IMP 8 life. Dr. Adam Szabo is about to assume the role.

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Author:Miranda Beall
Curator:Lori Persichitti
Responsible Official: Dr. Joseph H. King, Code 633
Last Revised: 16 May 2000 [NAB]