Cassini Magnetometer Calibrated Bundle Cassini MAG Calibrated 1 Sec. Avg. Data in KRTP Coords. Collection Description PDS3_DATA_SET_ID = CO-E/SW/J/S-MAG-4-SUMM-1SECAVG-V2.0 ORIGINAL_DATA_SET_RELEASE_DATE = 2017-10-09 Version 2.0 Release Date = 2019-06-17 START_TIME = 2001-01-01T02:26:04.5 STOP_TIME = 2017-09-12T05:27:18.5 PRODUCER_FULL_NAME = JOSEPH N. MAFI Data Collection Description Data Collection Overview ======================== This data collection contains magnetic-field data acquired during the cruise and tour phases of the Cassini mission to Saturn. 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 collection. 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 collection contains calibrated, and averaged magnetic-field data recorded by the FGM instrument. The data are provided in both 1 second. The 1 second averaged data files span 1 quarter of year prior to arrival at Saturn, and 1 Saturn orbit following arrival at Saturn. After arrival at Saturn, the Saturn-centered KRTP coordinates are also provided. 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. Averaging for the 1 second data was performed at the PDS-PPI Node. Processing ========== Coordinate Systems ================== The coordinate systems in which the data are provided in vary by mission phase, and are designed to support both solar wind and planetary magnetospheric studies. Saturn-Centered Coordinates --------------------------- Kronocentric body-fixed, J2000 spherical Coordinates (KRTP) ----------------------------------------------------------- KRTP magnetic field vector components form the standard right-handed spherical triad (R, Theta, Phi) for a planet-centered system. Namely, R is radial (along the line from the center of Saturn to the center of the spacecraft), and positive away from Saturn. Phi, the azimuthal component, is parallel to the Kronographic equator (Omega x R) and positive in the direction of corotation. Theta, the 'southward' component, completes the right-handed set. SPICE ===== The data product labels associated with the data collection include a list of the SPICE kernels that were used in calibrating the associated data, and coverting them to physical coordinates. While the SPICE kernels used are not part of this data collection, these kernels are archived at the PDS-NAIF node on the volume cosp_1000. Note that the SPICE kernels listed in each of the product labels may be uniquely identified by their file name. CONFIDENCE_LEVEL_NOTE 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. The data were then averaged, and reformatted to ASCII 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. Averaging to 1 second was performed at PDS/PPI (UCLA). The data were then reformatted at PDS/PPI to match the format used for the version 1 data. PRODUCT_VERSION_ID 3 have followed the same path as the version 2 data, however, the data have been recalibrated. PRODUCT_VERSION_ID 4 data were processed following the same procedure that was followed for the version 2 data. However, previously undetected mis-time tagged data which were present in the full-resolution data were removed prior to averaging the data to 1 second. More details on the timing errors are provided in the confidence level note (below). PRODUCT_VERSION_ID 5 data were processed following the same procedure that was followed for the version 4 data, including the removal of mis-timed data before averaging. In addition, version 5 products have been modified to satisfy liens set in the PDS peer review. Including a change in record formatting, and changes to the PDS labels. PRODUCT_VERSION_ID 6 data were processed using an updated calibration that was produced using data from the Cassini Proximal Orbits. References ========== Asmar, S.W., and N.A. Renzetti, The Deep Space Network as an Instrument for Radio Science Research, Jet Propulsion Laboratory Publication 80-93, Rev.1, 15 April 1993. Cassini Mission Plan, Revision N (PD 699-100), JPL Document D-5564, Jet Propulsion Laboratory, Pasadena, CA, 2002. Dougherty, M.K., S. Kellock, D.J. Southwood, A. Balogh, E.J. Smith, B.T. Tsurutani, B. Gerlach, K.H. Glassmeier, F. Gleim, C.T. Russell, G. Erdos, F.M. Neubauer, and S.W.H. Cowley, The Cassini Magnetic Field Investigation, Space Science Reviews, Vol. 114, Nos. 1-4, pp. 331-383, September 2004 Kellock, S., P. Austin, A. Balogh, B. Gerlach, R. Marquedant, G. Musmann, E. Smith, D. Southwood and S. Szalai, Cassini dual technique magnetometer instrument (MAG), Proc. SPIE, Denver, Colorado, 2803, 141, 1996. Smith, E.J., M.K. Dougherty, C.T. Russell, and D.J. Southwood, Scalar helium magnetometer observations at Cassini Earth swing-by, J. Geophys. Res., 106, 30129, 2001.