|
Fundamental TechnologiesGalileo Spacecraft Pages |
6.2.2 Electron Results (continued)
The story for the tracing of electrons in model M2 is much the same as model M1 during the inbound portion. The first occurrence of a loss cone, however, happens later. Figure 6.46 shows the first predicted loss cone signature for the electrons in model M2 taking place at 18:49:24, which is about 20 s from the actual occurrence of 18:49:43. The arrow in Figure 4.46 indicates the trajectory that is broken down into a pitch and phase scatter plot in Figure 6.47 for channel E3 subenergy 74 keV. Figure 6.47 indicates that the loss cone for this feature is aLC~=19°. Sublook 1 is chosen for a detailed time-reversed tracing, the results of which are shown in Figures 6.48 to 6.53 and summarized in Table 6.7.
 |
Figure 6.46 (A) Rate profile for feature G2-18:49:11 for channel E3 model M2 compared to real data (Re). Model M2 predicts the magnetic field connects to Ganymede at 18:49:24. (B) The pitch (a) and phase (f) values of the particles as measured by the EPD detector relative to the real R and simulated S field. |
 |
Figure 6.47 Collimator pitch and phase scatter plot of the data point indicated in Figure 6.46 for model M2 channel E3 subenergy 74 keV. This can be clearly seen as a loss cone signature due to Ganymede. The loss cone angle is predicted to be about 20° for this model M2 feature. |
 |
Figure 6.48 (A) Length of the radius vector from the center of Ganymede to the particle as a function of trace time in seconds for subenergy 74 keV sublook direction 1 for model M2 channel E3. (B) The Z component of the particle position in GSII coordinates for subenergy 74 keV sublook direction 1 for model M2 channel E3. |
 |
Figure 6.49 (A) The X component of the particle position in GSII coordinates for subenergy 74 keV sublook direction 1 for model M2 channel E3. (B) The Y component of the particle position in GSII coordinates for subenergy 74 keV sublook direction 1 for model M2 channel E3. |
 |
Figure 6.50 (A) Magnetic field at the location of the particle as a function of trace time for subenergy 74 keV sublook direction 1 for model M2 channel E3. (B) Magnetic moment at the location of the particle as a function of trace time for subenergy 74 keV sublook direction 1 for model M2 channel E3. |
 |
Figure 6.51 (A) Velocity of the particle as a function of trace time for subenergy 74 keV sublook direction 1 for model M2 channel E3. (B) Pitch angle of the particle as a function of trace time for subenergy 72 keV sublook direction 1 for model M2 channel E3. |
 |
Figure 6.52 ZX projection of the trajectory for subenergy 74 keV sublook direction 1 for model M2 channel E3. |
 |
Figure 6.53 ZY projection of the trajectory for subenergy 74 keV sublook direction 1 for model M2 channel E3. |
Table 6.7 Summary of Figures 6.48 through 6.53 for subenergy 74 keV sublook direction 1 for model M2 channel E3.
| Figure | Information | Observation |
| 6.48 | (A) Radius of particle from Ganymede. (B) Z component of particle trajectory. | Particle moves along the field line until impacting Ganymede. |
| 6.49 | (A) X component of particle trajectory. (B) Y component of particle trajectory. | Particle moves along the field line until impacting Ganymede |
| 6.50 | (A) Magnetic field sampled by the particle. (B) Magnetic moment sampled by the particle. | The value of the magnetic field for this trajectory is near zero at t=0 s. Value of magnetic moment fluctuates until the magnetic field reaches 70 nT. |
| 6.51 | (A) Speed of the particle. (B) Pitch angle of the particle. | The speed of the particle is constant through the entire trajectory. The pitch angle shows the particle moves nearly parallel along the entire trajectory. |
| 6.52 | ZX projection of the trajectory of the particle. | The trajectory along the first field line connecting to Ganymede. |
| 6.53 | ZY projection of the trajectory of the particle. | The trajectory along the first field line connecting to Ganymede. |
Next: 6.3 Closest Approach Results
Return to dissertation table of contents page.
Return to main Galileo Table of Contents Page.
Return to Fundamental Technologies Home Page.
Updated 10/22/02, T. Hunt-Ward
tizby@ftecs.com