Data Set Information
DATA_SET_NAME VG2 SAT MAG RESAMPLED KRONOGRAPHIC (L1) COORDS 9.6SEC V1.1
DATA_SET_ID VG2-S-MAG-4-RDR-L1COORDS-9.6SEC-V1.1
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION
Data Set Overview : This data set includes Voyager 2 Saturn encounter magnetometer data from the Low Field Magnetometer (LFM) resampled at a 9.6 second sample rate from the 60 msec instrument sampling rate. Data coverage begins in the solar wind and continues until at least the first magnetopause crossing. The data are given in Kronographic (L1) coordinates. The data set is composed of the following columns: 1) time - UT of the sample in the format yyyy-mm-ddThh:mm:ss.sssZ, 2) spacecraft clock values (m65536:mod60:fds_line), 3) mag_id - magnetometer id (1 : LFM, 2 : HFM), 4) Br - radial (Saturn to spacecraft) B-field component, 5) Btheta - North/South (L1) B-field component (positive southward), 6) Bphi - azimuthal (L1) B-field component (positive eastward), 7) Bmag - magnitude of the averaged magnetic field components, 8) avg_Bmag - average of the magnetic field magnitudes, 9) delta - magnetic latitude : arcsin(Btheta/Bmag), 10) lambda - longitude : 180. - atan(Bphi/-Br), 11-13) rms_br, rms_bt, and rms_bn - rms vectors, 14) npts - number of points in average. All magnetic field observations are measured in nanoTesla. All of the magnetic field data are calibrated (see the instrument calibration description for more details). These data are provided in a Saturn centered spherical system (L1), based on the Saturn Longitude System (Voyager Measurements of the Rotation Period of Saturn's Magnetic Field, Desch and Kaiser, JGR, 8, 253, 1981). The the magnetic field components are: BR - radial B-field component (along the Saturn to spacecraft line) positive away from Saturn BTHETA - North/South (L1) B-field component, positive southward BPHI - azimuthal (L1) B-field component, positive eastward. Processing Level Id : 4 Software Flag : Y Processing Start Time : 1988-09-21 Parameters : Sampling Parameter Name : TIME Data Set Parameter Name : MAGNETIC FIELD VECTOR Sampling Parameter Resolution : 9.600000 Minimum Sampling Parameter : 19770820120000.000000 Maximum Sampling Parameter : UNK Sampling Parameter Interval : 9.600000 Minimum Available Sampling Int : 0.060000 Data Set Parameter Unit : NANOTESLA Noise Level : 0.006000 Sampling Parameter Unit : SECOND PARAMETER RESOLUTION DESCRIPTION NAME (UNITS) time 9.6 Sec time of the sample (UT) in the format yyyy-mm-ddThh:mm:ss.sssZ. The full sampling rate for the instrument is .06 +/- .006 sec. m65536, (counts) s/c clock mod 65536, mod 60 and mod60 and fds line fds_line mag_id n/a magnetometer ID magnetic (nT) measured parameter equaling the field magnetic field strength (e.g. in components nanoTeslas) along a particular axis (Br, Btheta, direction. Usually the three Bphi) orthogonal axis components are measured by three different sensors. magnetic (nT) derived parameter which combines the 3 field vector orthogonal magnetic field component (Bmag, avg_Bmag) measurements. delta n/a delta : arcsin(Btheta/Bmag) lambda n/a lambda : 180. - atan(Bphi/-Br) rms_Br, Pythagorean root mean square deviation rms_Bt, and of the component averages rms_Bp npts (counts) the number of data points in the current average Source Instrument Parameters : Instrument Host ID : VG2 Data Set Parameter Name : MAGNETIC FIELD VECTOR Instrument Parameter Name : MAGNETIC FIELD COMPONENT Important Instrument Parameters : 1 Instrument Host ID : VG2 Data Set Parameter Name : MAGNETIC FIELD VECTOR Instrument Parameter Name : WAVE MAGNETIC FIELD INTENSITY Important Instrument Parameters : 1 Processing : Processing History ------------------ Source Data Set ID : N/A Software : UNK Product Data Set ID : VG2-S-MAG-4-9.60SEC Ancillary Data : An ancillary data file containing the derived spacecraft magnetic field is provided with this data at a 48 second sample rate. These data provide zero level offsets used in the data processing. S/C field data is provided in spacecraft coordinates as follows: PARAMETER RESOLUTION DESCRIPTION NAME (UNITS) time 48 sec time in format yyyy-mm-ddThh:mm:ss.sssZ m65536 n/a s/c clock mod 65536 mod60 n/a s/c clock mod60 mag_id n/a magnetometer ID Bx (nT) spacecraft coords. X component By (nT) spacecraft coords. Y component Bz (nT) spacecraft coords. Z component Bmag (nT) total magnetic field strength rms_Bx (nT) rms mag component rms_By (nT) rms mag component rms_Bz (nT) rms mag component npts (counts) number of points in average
DATA_SET_RELEASE_DATE 1996-01-01T00:00:00.000Z
START_TIME 1981-08-23T10:34:23.645Z
STOP_TIME 1981-08-29T11:59:49.478Z
MISSION_NAME VOYAGER
MISSION_START_DATE 1972-07-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME SATURN
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID VG2
INSTRUMENT_NAME TRIAXIAL FLUXGATE MAGNETOMETER
INSTRUMENT_ID MAG
INSTRUMENT_TYPE MAGNETOMETER
NODE_NAME Planetary Plasma Interactions
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE
Confidence Level Overview : This data set contains some data gaps and spikes. The data set does contain a flag value which has been provided by the PI (Norman Ness) that indicates whether or not a particular record has been contaminated by software error or by spacecraft interference (a flag value of 1 indicates a bad value, 0 indicates that the record has either not been evaluated or is good). Some records that are obviously contaminated have not been flagged. The hourly summary data will show a contamination code and data quality code of 2 when data in the hour have not been flagged but are obviously in error and a contamination code of 1 when the hour contains flagged records. Data Coverage : Filename Records Start Stop ----------------------------------------------------------------------- Volume ID: VG_1601 L1_9_6S.TAB 56641 1981-08-23T10:34:23.645Z 1981-08-29T23:59:49.478Z Missing Data Flag : Any data column whose value is 9999.999 is a missing data value.
CITATION_DESCRIPTION Ness, N.F., Connerney, J.E., Lepping, R.P., VG2-S-MAG-4-RDR-L1COORDS-9.6SEC-V1.1, VG2 SAT MAG RESAMPLED KRONOGRAPHIC (L1) COORDS 9.6SEC V1.1, NASA Planetary Data System, 1996.
ABSTRACT_TEXT This data set includes Voyager 2 Saturn encounter magnetometer data from the Low Field Magnetometer (LFM) resampled at a 9.6 second sample rate from the 60 msec instrument sampling rate. Data coverage begins in the solar wind and continues until at least the first magnetopause crossing. The data are given in Kronographic (L1) coordinates. The data set is composed of the following columns: 1) time - UT of the sample in the format yyyy-mm-ddThh:mm:ss.sssZ, 2) spacecraft clock values (m65536:mod60:fds_line), 3) mag_id - magnetometer id (1 : LFM, 2 : HFM), 4) Br - radial (Saturn to spacecraft) B-field component, 5) Btheta - North/South (L1) B-field component (positive southward), 6) Bphi - azimuthal (L1) B-field component (positive eastward), 7) Bmag - magnitude of the averaged magnetic field components, 8) avg_Bmag - average of the magnetic field magnitudes, 9) delta - magnetic latitude : arcsin(Btheta/Bmag), 10) lambda - longitude : 180. - atan(Bphi/-Br), 11-13) rms_br, rms_bt, and rms_bn - rms vectors, 14) npts - number of points in average. All magnetic field observations are measured in nanoTesla. All of the magnetic field data are calibrated (see the instrument calibration description for more details). These data are provided in a Saturn centered spherical system (L1), based on the Saturn Longitude System (Voyager Measurements of the Rotation Period of Saturn's Magnetic Field, Desch and Kaiser, JGR, 8, 253, 1981).
PRODUCER_FULL_NAME NATIONAL SPACE SCIENCE DATA CENTER
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