URAP Operations - Ulysses
Unified Radio and Plasma Wave Investigation (URAP)
The URAP (STO) Experiment has two scientific objectives:
- to determine the direction and polarization of distant radio sources for remote sensing of the Heliosphere
- to study the local wave phenomena which determine the transport coefficients of the ambient plasma.
The URAP experiment provides electric field measurements from "DC" to 1 MHz and magnetic field measurements from 0.22 to 450 Hz. For more scientific information, visit the following URAP team websites:
Power and Mass Properties
|
The instrument consists of 7 units: |
Power Dissipation |
Mass |
||||||
|
Mean |
Peak |
Heater |
||||||
|
mA |
W |
mA |
W |
mA |
W |
|||
|
STO 1 |
Power Converters and RF Radiometer |
178.5 |
5.00 |
184.5 |
5.17 |
2.3754 |
||
|
STO 2 |
Plasma Wave Analyzer |
147.5 |
4.13 |
147.5 |
4.13 |
3.3852 |
||
|
STO 3A |
Dipole Antenna Preamp 1 (+X) |
10.0 |
0.28 |
18.9 |
0.53 |
0.2232 |
||
|
STO 3B |
Dipole Antenna Preamp 1 (-X) |
10.0 |
0.28 |
18.9 |
0.53 |
0.2239 |
||
|
STO 4 |
Monopole Antenna Preamp (Z) |
9.6 |
0.27 |
9.6 |
0.27 |
0.2118 |
||
|
STO 5 |
Search Coil Preamp |
2.1 |
0.06 |
2.1 |
0.06 |
0.3447 |
||
|
STO 6 |
Search Coil Magnetometer |
- |
- |
- |
- |
33.0 |
0.92 |
0.5322 |
|
|
STO 1 / STO 2 Harness |
0.0844 |
||||||
|
Total |
|
357.7 |
10.02 |
381.5 |
10.69 |
33.0 |
0.92 |
7.3808 |
|
There are also 3 boom antennas: |
Power Dissipation (only during deployment) |
Mass |
||||||
|
Mean |
Peak |
Heater |
||||||
|
mA |
W |
mA |
W |
mA |
W |
|||
|
Wire Boom Drive (+X) |
~430 |
~12 |
~430 |
~12 |
0.498 |
|||
|
Wire Boom Drive (-X) |
~430 |
~12 |
~430 |
~12 |
0.501 |
|||
|
Axial Boom Drive (Z) |
~250 |
~7 |
~250 |
~7 |
1.781 |
|||
|
Wire Boom / Axial Boom Electronics |
0.677 |
|||||||
|
Total |
|
3.447 |
||||||
Operational issues
Every day, the Plasma Frequency Receiver is switched from fast-to-slow or slow-to-fast scanning. Auto-calibration, which had been performed throughout the mission, was terminated at the end of 2001. Manual calibrations are now performed on a monthly basis. STO Sounder activity also ceased at the end of 2001. The STO 6 heater will be switched off for the remainder of the mission.