Volume 16, Number 1, March 2000
By Joseph King
Dr. Valeri Petrov of the Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation (IZMIRAN) near Moscow visited NSSDC on March 14, 2000, to discuss the archiving at NSSDC of magnetic field data obtained from the Interball-Tail spacecraft of the 1990s (a contributor to the International Solar-Terrestrial Physics program) and from the earlier Prognoz 6, 7, and 9 spacecraft. These spacecraft all have or had eccentric geocentric orbits.
The data are magnetic field vectors at 6-sec (Interball) or 10-sec (Prognoz) resolution, accompanied by measurement location information. They are presently in GSE coordinates and, for Prognoz at least, are likely to be transformed to GSM, also. The Prognoz data cover the periods September 1977-January 1978, November 1978-May 1979, and July 1983-February 1984. Local time of apogee for most of these intervals was on the Earth's day side, so significant amounts of solar wind data are included. The Interball data will initially cover August 1995-March 1997, although later data may be prepared and archived in the future.
The data are being submitted in ASCII format in which they will be made FTP-accessible from NSSDC. In addition, the Interball data are being converted at NSSDC to CDF for inclusion in CDAWeb. While at NSSDC Dr. Petrov worked with Dr. Ramona Kessel and Dr. Natalia Papitashvili in the creation of documentation files (readme's) to support data use.
The data were prepared at IZMIRAN in part with competitively won NASA data restoration funding. The Prognoz data supersede 5-min resolution Prognoz magnetic field data provided to NSSDC many years ago; the new data are at higher resolution and have more reliable data values.
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