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

This Data Set includes Data from the Low Field Magnetometer (LFM) in the Solar Wind during the Uranus Encounter. The Encounter Data (1986-01-24T07:00:00 to 1986-01-25T04:00:00) have been averaged from the 60 ms Instrument Sampling Rate to a 1.92 s resampled Rate and are provided in the Uranus Longitude (U1) Coordinate System. Magnetometer Data in the Solar Wind are given in Heliographic Coordinates and are also available in a separate Data Set.

The Data Set consists of the following Columns:

• 1. ctime - Decimal Seconds since 1966-01-01T00:00:00.000
• 2. pdstime - ISO Standard Time Format
• 3. Spacecraft Clock Value - m65536
• 4. Spacecraft Clock Value - mod60
• 5. Spacecraft Clock Value - fds_line
• 6. mag_id - Magnetometer ID: 1=LFM, 2=HFM
• 7. Br - Radial Component
• 8. Bphi - Longitudinal Component
• 9. Btheta - Colatitudinal Component
• 10. Bmag - Magnitude of the averaged Magnetic Field Components
• 11. avg_Bmag - Average of the Magnitude of the raw Components
• 12. lambda - Magnetic Longitude, lambda=atan(Bt/Br)
• 13. delta - Magnetic Latitude, delta=asin(Bn/avg_Bmag)
• 14. rms_br - Br Pythagorean RMS Deviation of the Component Average
• 15. rms_bt - Bt Pythagorean RMS Deviation of the Component Average
• 16. rms_bn - Bn Pythagorean RMS Deviation of the Component Average
• 17. npts - Number of Points in the Average
• 18. Data Flag - A Character String which indicates Software or Spacecraft Hardware Intervention which reduces Confidence in the Data, Null Flags represent "good" Data

The U1 Coordinate System is a Non-inertial Spherical Coordinate System that rotates with Uranus with a Period of 17.24 h. The Magnetic Field Components in the U1 Coordinate System are:

• Br - Radial Magnetic Field Component, along the Uranus to Spacecraft Line, positive away from Uranus
• Bphi - East Longitudinal (U1) Magnetic Field Component
• Btheta - Colatitudinal (U1) Magnetic Field Component

An ancillary Data File containing the derived Spacecraft Magnetic Field is provided with these Data at a 48 s Sample Rate. These Data provide Zero Level Offsets used in the Data Processing. Spacecraft Field Data is provided in Spacecraft Coordinates.

+--------------------------------------------------------+
| Parameter Characteristics | Value |

| Sampling Parameter Name | TIME |
| Sampling Parameter Resolution | 1.920000 |
| Minimum Sampling Parameter | 19770820120000.000000 |
| Maximum Sampling Parameter | UNK |
| Sampling Parameter Interval | 1.920000 |
| Minimum Available Sampling Int | 0.060000 |
| Sampling Parameter Unit | SECOND |
| Data Set Parameter Name | MAGNETIC FIELD VECTOR |
| Noise Level | 0.006000 |
| Data Set Parameter Unit | NANOTESLA |
+--------------------------------------------------------+