This data set includes Voyager 2 Jupiter encounter magnetometer data that have been resampled at a 9.6 second sample rate. The data set is composed of 6 columns: 1) ctime - this column contains the data acquisition time. The time is always output in the ISO standard spacecraft event time format (yyyy-mm-dd-Thh:mm:ss.sss) but is stored internally in Cline time which is measured in seconds after 00:00:00.000 Jan 01, 1966, 2) br - this column contains the radial component of the magnetic field, 3) bphi - this column contains the phi component of the magnetic field, 4) btheta - this column contains the theta component of the magnetic field, 5) bmag - this column contains the magnitude of the magnetic field, 6) flag - a flag value that indicates either software error or spacecraft hardware interference reduced confidence in this record (flag value of 1 is bad , 0 is good or unchecked). All magnetic field observations are measured in nanoTeslas. The coordinate system for this dataset is Minus System III. All of the magnetic field data are calibrated (see the instrument calibration description for more details). The Jupiter System III coordinate system is defined in Dessler 1983 and the reference documents for this dataset are: Ness et al, 1979A Lepping et al, 1981 Connerney,Acuna,Ness, 1981 Behannon,Burlaga,Ness, 1981

• Data Set Overview

• =================

• Version 1.1

• ===========

This Version 1.1 Data Set replaces the Version 1.0 Data Set (DATA_SET_ID=VG1-J-MAG-4-9.60SEC) previously archived with PDS. Changes to this Version include the Addition of Data Columns not included in Version 1.0, the Modification of Time Format and Flag Values, and Upgrade of associated Labels and Catalog Templates to PDS Version 3.2.

• Data Set Overview
• =================

This Data Set includes calibrated Magnetic Field Data acquired by the Voyager 1 Low Field Magnetometer (LFM) during the Jupiter Encounter. Coverage begins in the Solar Wind inbound to Jupiter and continues past the last outbound Bowshock Crossing. The Data are in System III (1965) (SYS3) Coordinates and have been averaged from the 1.92 s Summary Data to a 9.6 s Sample Rate. All Magnetic Field Measurements are given in nT. The Magnetic Field Data are calibrated (see the Calibration Description included in the Voyager 1 Magnetometer Instrument Catalog File for Details).

• Parameters
• ==========

The full LFM Instrument Sample Rate is one Sample per 0.06 s. Full Telemetry Resolution "Detail" Data must be obtained from the Instrument Team. For this Data Set, the Data have been resampled to 9.6 s from 1.92 s Summary Data. The 1.92 s Data were in turn resampled from the Detail Data.

The LFM has eight Dynamic Ranges. The Instrument is designed to switch between Dynamic Ranges automatically depending on the observed Magnetic Field Magnitude and Fluctuations. Instrument Digitization Uncertainty depends on the Dynamic Range as indicated in the following Table from (Behannon et al., 1977).

• LFM Dynamic Ranges and Quantization Uncertainty
• ===============================================

+----------------------------------------------+

| Range Num | Range (nT) | Quantization (nT) |

| 1 | ±8.8 | ±0.0022 | | 2 | ±26 | ±0.0063 | | 3 | ±79 | ±0.019 | | 4 | ±240 | ±0.059 | | 5 | ±710 | ±0.173 | | 6 | ±2,100 | ±0.513 | | 7 | ±6,400 | ±1.56 | | 8 | ±50,000 | ±12.2 | +----------------------------------------------+

• Processing
• ==========

Voyager EDRs undergo the following Processing in order to produce these 9.6 s averaged Summary Data:

• Read EDR
• Unpack Header Block (Receiver ID, Spacecraft ID, Telemetry Mode, FDS Counts, Data Flags)
• Convert selected Time Tags to Integer Time (YY/DDD/HH:MM:SS.FFF)
• Unpack Sub-header Block (MAG Status Words, Plasma Data)
• Unpack Science Block (MAG Counts)
• Convert Counts to nT
• Apply Sensor and Boom Alignment Matrices
• Rotate (optional) 1.92 s Averages while averaging Detail Data in nT to create 1.92 s Averages
• Average 1.92 s Data to 9.6 s
• Write Summary Record

Counts are measured onboard using 12-bit Words that may represent Values ranging from 0 to 4096. Integer Counts are converted to Magnetic Field Units (nT) by subtracting a Zero Offset from the measured MAG Value and multiplying this Difference by the Sensitivity of the Instrument.

• Data
• ====

The Data Files are given in ASCII, Fixed Field Width, Comma-delimited Tables. The Record Structure is described in the following Table:

• Resampled Magnetic Field Data in System III (1965) Coordinates
• ==============================================================

+------------------------------------------------------------------------------------------------------------+

| Column | Type | Description |

| Time | a23 | Spacecraft Event Time (UT) of the Sample in the Format: YYYY-MM-DDTHH:MM:SS.SSS | | sclk | a12 | Spacecraft Clock in the Format: MOD65536:MOD60:FDS-LINE | | mag_id | i1 | Magnetometer ID (1=LFM, 2=HFM) | | Br | f9.3 | Average of Detail Magnetic Field R Component in nT | | Btheta | f9.3 | Average of Detail Magnetic Field Theta Component in nT | | Bphi | f9.3 | Average of Detail Magnetic Field Phi Component in nT | | Bmag | f | | +------------------------------------------------------------------------------------------------------------+

This data set includes Voyager 1 Jupiter encounter magnetometer data that have been resampled at a 48.0 second sample rate. The data set is composed of 6 columns: 1) ctime - this column contains the data acquisition time. The time is always output in the ISO standard spacecraft event time format (yyyy-mm-dd-Thh:mm:ss.sss) but is stored internally in Cline time which is measured in seconds after 00:00:00.000 Jan 01, 1966, 2) br - this column contains the radial component of the magnetic field, 3) bphi - this column contains the phi component of the magnetic field, 4) btheta - this column contains the theta component of the magnetic field, 5) bmag - this column contains the magnitude of the magnetic field, 6) flag - a flag value that indicates either software error or spacecraft hardware interference reduced confidence in this record (flag value of 1 is bad , 0 is good or unchecked). All magnetic field observations are measured in nanoTeslas. The coordinate system for this dataset is Minus System III. All of the magnetic field data are calibrated (see the instrument calibration description for more details). The Jupiter System III coordinate system is defined in Dessler 1983 and the reference documents for this dataset are: Ness et al, 1979 Lepping et al, 1981 Connerney,Acuna,Ness, 1981 Behannon,Burlaga,Ness, 1981

This bundle consists of Voyager 1 Jupiter encounter ephemeris data in Heliographic coordinates. Two versions, both covering the same time period, but containing slightly different data, are provided. One version was generated by the Voyager MAG team from Voyager 1 SEDR, the other by the PDS/PPI node using the VG1_JUP.BSP and PCK00003.TPC SPICE kernels.

This data set includes Voyager 2 Jupiter encounter magnetometer data given in Heliographic coordinates and averaged from the 60 ms instrument sample rate to a 9.6 second resampled rate. The data set consists of the following columns: 1) UT of the sample in the format yyyy-mm-ddThh:mm:ss.sssZ, 2) spacecraft clock (m65536:mod60:fds-line), 3) magnetometer id (1 = LFM, 2 = HFM), 4) Br (radial, Sun to spacecraft, B-field component), 5) Bt (azimuthal B-field component, positive in the direction of planetary orbital motion), 6) Bn (North/South B-field component, positive northward), 7) Bmag (magnitude of the averaged components), 8) avg_Bmag (average of the magnetic field magnitudes), 9) delta (latitude = arcsin(Bn/Bmag)), 10) lambda (longitude = 180. - atan(Bt/Br)), 11-13) 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).

This data set contains calibrated magnetic field data acquired by the Voyager 1 Low Field Magnetometer (LFM) during the Jupiter encounter. Coverage begins in the solar wind inbound to Jupiter and continues past the last outbound bowshock crossing. The data are in System III (1965) (SYS3) coordinates and have been averaged from the 9.6 second summary data to a 48 second sample rate.

Voyager 1 9.6 second averaged magnetometer data from the Jupiter encounter in Heliographic (RTN) coordinates.

This data set includes Voyager 2 Jupiter 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 Jovicentric System III(1965) right handed 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 (Jupiter to spacecraft) B-field component, 5) Btheta - North/South (system III) B-field component (positive southward), 6) Bphi - azimuthal (system III) 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).

Voyager 1 1.92 second averaged magnetometer data from the Jupiter encounter in System 3 (1965) coordinates.

Voyager 1 9.6 second averaged magnetometer data from the Jupiter encounter in System 3 (1965) coordinates.

Voyager 1 1.92 second averaged magnetometer data from the Jupiter encounter in Heliographic (RTN) coordinates.