Investigation of the Magnetosphere of Ganymede with Galileo's Energetic Particle Detector
Ph.D. dissertation by Shawn M. Stone, University of Kansas,
1999.
Copyright 1999 by Shawn M. Stone. Used with permission.
8.5 Corotational and Parallel Electric Field Implications
The results for the corotational and parallel electric fields were presented in chapter 7. It was shown that for the case of corotational electric fields, a value greater than 25% of full corotation caused the appearance of anti-loss cone features where none existed in the observed data. This occurred for both models M1 and M2 and is summarized in Table 8.15. It was shown in Figures 7.22 and 7.29 that the appearance of an anti-loss cone could be explained by the anti-parallel component of the corotational electric field along the magnetic field direction.
Table 8.15 Outbound feature G2-18:56:31. The simulated run is performed in one shot mode with corotational electric field permeating into the magnetosphere of Ganymede.
| Model | Result | Figure |
| M1 | Channel A4 ions at 85% of corotation. There seems to be no effect on the ions at this level of field. | 7.1 |
| M1 | Channel E1 electrons at 25% of corotation. There seems to be no effect on the electrons at this level of field. | 7.2 |
| M1 | Channel E1 electrons at 50% of corotation. An anti-loss cone forms at this level of field. | 7.3 |
| M1 | Channel E3 electrons at 50% of corotation. There seems to be no effect on the electrons at this level of field. | 7.4 |
| M1 | Channel E3 electrons at 85% of corotation. An anti-loss cone forms at this level of field. | 7.5 |
| M1 | Channel F2 electrons at 85% of corotation. There seems to be no effect on the electrons at this level of field. | 7.6 |
| M2 | Channel A4 ions at 85% of corotation. There seems to be no effect on the ions at this level of field. | 7.7 |
| M2 | Channel E1 electrons at 25% of corotation. There seems to be no effect on the electrons at this level of field. | 7.8 |
| M2 | Channel E1 electrons at 50% of corotation. An anti-loss cone forms at this level of field. | 7.9 |
| M2 | Channel E3 electrons at 50% of corotation. There seems to be no effect on the electrons at this level of field. | 7.10 |
| M2 | Channel E3 electrons at 85% of corotation. An anti-loss cone forms at this level of field. | 7.11 |
| M2 | Channel F2 electrons at 85% of corotation. There seems to be no effect on the electrons at this level of field. | 7.12 |
To explain the widening of the loss cone signatures during the outbound pass of G2, it was thought that this might be due to a parallel electric field as well. By adding parallel electric field to the simulation it was shown in section 7.2 that for both models parallel electric field was unable to adequately recover the features for either model. This result is summarized in Table 8.16.
Table 8.16 Outbound feature G2-19:10:51. The simulated run is performed in one shot mode with anti-parallel electric field.
| Model | Result | Figure |
| M1 | Channel E1 electrons. A value of 10 mV already has effect on the simulated feature. | 7.44 |
| M1 | Channel E1 electrons. A value of 50 mV over-extends the loss cone signature in width and depth. | 7.45 |
| M1 | Channel E3 electrons. A value of 10 mV already has effect on the simulated feature. It seems that it could match with increasing field. | 7.46 |
| M1 | Channel E3 electrons. A value of 50 mV over-extends the loss cone signature in width and depth. | 7.47 |
| M1 | Channel F2 electrons. A value of 10 mV seems to have little effect on the absorption feature. | 7.48 |
| M1 | Channel F2 electrons. A value of 50 mV seems that it might eventually match the observed feature. | 7.49 |
| M2 | Channel E1 electrons. A value of 10 mV already has effect on the simulated feature. | 7.50 |
| M2 | Channel E1 electrons. A value of 50 mV over-extends the loss cone signature in width and depth. | 7.51 |
| M2 | Channel E3 electrons. A value of 10 mV already has effect on the simulated feature. It seems that it could match with increasing field. | 7.52 |
| M2 | Channel E3 electrons. A value of 50 mV over-extends the loss cone signature in width and depth. | 7.53 |
| M2 | Channel F2 electrons. A value of 10 mV seems to have little effect on the absorption feature. | 7.54 |
| M2 | Channel F2 electrons. A value of 50 mV seems that it might eventually match the observed feature. | 7.55 |
Next: 8.6 Conclusions and Proposal for Future Study
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Updated 8/23/19, Cameron Crane
QUICK FACTS
Mission Duration: Galileo was planned to have a mission duration of around 8 years, but was kept in operation for 13 years, 11 months, and 3 days, until it was destroyed in a controlled impact with Jupiter on September 21, 2003.
Destination: Galileo's destination was Jupiter and its moons, which it orbitted for 7 years, 9 months, and 13 days.