NSSDCA ID: PSFP-00366
Availability: Archived at NSSDC, accessible from elsewhere
This description was generated automatically using input from the Planetary Data System.
Data Set Overview ================= This data set contains magnetic-field data acquired during the cruise and tour phases of the Cassini mission to Saturn. The data set begins with data collected on 16 August (day 228), 1999 and ends on 17 November (day 321), 2005 when the instrument failed. On 16 August, 1999 two days before the spacecraft commenced Earth swingby, the magnetometer boom was unfurled into its extended position; a configuration it maintained for the remainder of the mission. Magnetic-field data acquired prior to boom deployment are limited and are significantly affected by spacecraft noise. These data are of no scientific value and, consequently, do not form part of this data set. Cassini carried two magnetometers: a fluxgate magnetometer (FGM) and a vector-helium magnetometer capable of operating in both vector and scalar mode (V/SHM). This data set contains calibrated, and averaged magnetic-field data recorded by the FGM instrument. The data are provided in both 1 second and 1 minute averages. The 1 second averaged data files span 1 quarter of year prior to arrival at Saturn, and 1 Saturn orbit following arrival at Saturn. The 1 minute data are provided in year files. The data are provided in RTN coordinates throughout the mission. After arrival at Saturn, the Saturn-centered KRTP, KSO, and KSM coordinates are also provided. Earth-centered, and Jupiter-centered coordinates are provided for the flybys of those two planets. All data files are ASCII. These data were calibrated, and rotated into geophysical coordinates by the Cassini MAG team at Imperial College (IC), and provided to the PDS/PPI node via the Cassini MAG team Co-I at UCLA. In other words these data use the same calibration as the data routinely delivered to the Cassini MAG team. The 1 minute data were also averaged at IC. Averaging for the 1 second data was performed at PDS/PPI. The data were reformatted into their current ASCII format, add trajectory information was added to the 1 minute data at PDS/PPI. Product Versions ---------------PRODUCT_VERSION_ID 1 data were calibrated at the PDS/PPI node at UCLA using software (CAL02), and calibration data provided by the Cassini MAG team. The process used the same calibration data that was provided with the Raw Magnetometer data archive (Data Set ID: CO-E/SW/J/S-MAG-2-REDR-RAW-DATA-V1.0). The data were then rotated into geophysical coordinates using MAG team additonal MAG team provided code (TRANSCAL) and spice kernels obtained from NAIF. Additional processing, including averaging, reformatting to ASCII, and the addition of trajectory to the 1 minute data was performed using code developed at PDS/PPI. PRODUCT_VERSION_ID 2 data were calibrated, and rotated into geophysical coordinates by the Cassini MAG team at Imperial College, and provided to the PDS/PPI node via the MAG team Co-I at UCLA. The 1 minute data were also averaged at IC. Averaging for the 1 second data was performed at PDS/PPI. The data were reformatted at PDS/PPI to match the format used for the version 1 data. PRODUCT_VERSION_ID 3 data were processed following the same procedure that was followed for the version 2 data. However, subsequent to the release of the version 2 data it was discovered that the coordinate system trasformation for some of those data had been performed using predict SPICE kernels, rather than reconstructions. The version 3 were reprocessed using reconstructed ephemeris kernels for all of the data. PRODUCT_VERSION_ID 4 data were processed following the same procedure that was followed for the version 2 and 3 data. These data, however, were processed using only reconstructed SPK's to generate the trajectory data, thus correcting the errors which were present in the version 3 data. The MAG data do not differ between versions 3 and 4.
Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. David J. Southwood | Data Provider | Imperial College | d.southwood@ic.ac.uk |
Mr. Joseph N Mafi | General Contact | University of California, Los Angeles | jmafi@igpp.ucla.edu |