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.
7.1 Feature G2-18:56:31, the Addition of Corotational Electric Field (continued)
The trace at 50% is presented in Figures 7.23 through 7.28 and is summarized in Table 7.4. The corresponding parallel and perpendicular components of the velocity to the magnetic field are shown in Figure 7.29. It shows that the electron loses enough energy to experience an electric mirror point, bounce back, and be absorbed by Ganymede.
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Figure 7.23 50% of full corotation. (A) Length of the radius vector from the center of Ganymede to the particle as a function of trace time in seconds for subenergy 37 keV sublook direction 1 for model M1 channel E1. (B) The Z component of the particle position in GSII coordinates for subenergy 37 keV sublook direction 1 for model M1 channel E1. |
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Figure 7.24 50% of full corotation. (A) The X component of the particle position in GSII coordinates for subenergy 37 keV sublook direction 1 for model M1 channel E1. (B) The Z component of the particle position in GSII coordinates for subenergy 37 keV sublook direction 1 for model M1 channel E1. |
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Figure 7.25 50% of full corotation. (A) Magnetic field at the location of the particle as a function of trace time for subenergy 37 keV sublook direction 1 for model M1 channel E1. (B) Magnetic moment at the location of the particle as a function of trace time for subenergy 37 keV sublook direction 1 for model M1 channel E1. |
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Figure 7.26 50% of full corotation. (A) Velocity of the particle as a function of trace time for subenergy 37 keV sublook direction 1 for model M1 channel E1. (B) Pitch angle of the particle as a function of trace time for subenergy 37 keV sublook direction 1 for model M1 channel E1. |
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Figure 7.27 ZX projection of the trajectory for subenergy 37 keV sublook direction 1 for model M1 channel E1 at 50% of full corotation. |
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Figure 7.28 ZY projection of the trajectory for subenergy 37 keV sublook direction 1 for model M1 channel E1 at 50% of full corotation. |
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Figure 7.29 Model M1 E1 G2-18:56:31 subenergy 37 keV at .5 of full corotation. (A) The parallel component of the speed of the E1 particle relative to the magnetic field vector as a function of trace time. (B) The perpendicular component of the speed of the E1 particle relative to the magnetic field vector as a function of trace time. |
Table 7.4 Summary of the time-reversed particle trace presented in Figures 7.23 through 7.28 for subenergy 37 keV sublook direction 1 for model M1 channel E1 at 50% of full corotation.
| Figure | Information | Observation |
| 7.23 | (A) Radius of particle from Ganymede. (B) Z component of particle trajectory. | The E1 electron is reflected back to impact the surface of Ganymede. |
| 7.24 | (A) X component of particle trajectory. (B) Y component of particle trajectory. | The E1 electron is reflected back to impact the surface of Ganymede. |
| 7.25 | (A) Magnetic field sampled by the particle. (B) Magnetic moment sampled by the particle. | The E1 electron is reflected back to impact the surface of Ganymede. The maximum magnetic field sampled by the electron is 1400 nT. The magnetic moment remains constant. |
| 7.26 | (A) Speed of the particle as it moves through its trajectory. (B) Pitch angle of the particle. | The speed of the electron is reduced until it reaches its electrostatic mirror point. It is then accelerated along the magnetic field towards Ganymede. |
| 7.27 | ZX projection of the trajectory of the particle. | The electron is shown following the magnetic field line very closely. It reaches an electrostatic mirror point and is reflected towards Ganymede. |
| 7.28 | ZY projection of the trajectory of the particle. | The electron is shown following the magnetic field line very closely. It reaches an electrostatic mirror point and is reflected towards Ganymede. |
The results for the M2 model are qualitatively similar and are presented in Figures 7.30 through 7.43 and summarized in Tables 7.5 and 7.6.
Next: 7.2 Feature G2-19:10:51, the Addition of Parallel Electric Field
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Updated 8/23/19, Cameron Crane
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