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NASA Space Science Data Coordinated Archive Header



Availability: Archived at NSSDC, accessible from elsewhere

Time span: 1981-08-23 to 1981-08-29


This description was generated automatically using input from the Planetary Data System.

Data Set Overview ================= This data set includes Voyager 2 Saturn encounter magnetometer data from the Low Field Magnetometer (LFM) resampled at a 48.0 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 : 48.000000 Minimum Sampling Parameter : 19770820120000.000000 Maximum Sampling Parameter : UNK Sampling Parameter Interval : 48.000000 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 48 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 sc_r R[J] jovicentric (System III) spherical sc_lat degrees coordinates position vectors: range, sc_lon degrees latitude, and longitude npts (counts) the number of data points in the current average dflag n/a a character string which indicates software or s/c hardware intervention which reduces confidence in the data (NULL flags represent 'good' data) 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-4-48.0SEC 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

These data are available on-line from the Planetary Data System (PDS) at:

Alternate Names



  • Planetary Science: Fields and Particles

Additional Information



Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II



NameRoleOriginal AffiliationE-mail
Dr. Norman F. NessData ProviderUniversity of
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