Missions   Cassini Predicted Titan Magnetic Field Profiles

Predicted Titan Flyby Magnetic Field Profiles

The 44 figures linked to this page have been created by flying the T18-5 tour through the hybrid simulation of Steve Brecht that simulates the conditions of the Voyager flyby. The X direction points to Saturn; y points into the corotational direction, and z points northward. We have Janet Luhmann to thank for producing these files and Peter Chi for plotting them and producing the GIF files.

For each flyby we give the local time of Titan and the altitude of closest approach, the date and time of encounter from the lists prepared by Fritz Neubauer and Sylvestre Maurice. We have also classified the flybys into five families with subclassifications for easy cross reference. This allows us to cross reference the flybys in the comment section. The families are:

A: Wake as defined by the solid body and corotation

B: Above or below the wake defined in A

C: Flux tube crossings (classified by eye not field line tracing)

D: Upstream passes

E: Inside or outside passes as referenced to the radial vector from Saturn. These are often at quite a high inclination and could be quite useful in probing the structure of the near wake and Alfven wing.

The local time is given in eight sectors:

0   2230-0130 LT
0.5   0130-0430 LT
1.0   0430-0730 LT
1.5   0730-1030 LT
2.0   1030-1330 LT
2.5   1330-1630 LT
3.0   1630-1930 LT
3.5   1930-2230 LT


There is only one flyby in each of the 3 and 3.5 local time sectors.

The family designation often has a lower case designation that lists some particular feature:

i: inside, on the side closer to Saturn

o: outside, on the side away from Saturn

h: high inclination

n: north side of interaction region

s: south side of the interaction region

Finally we have given a rough indication of how long on either side of closest approach that the data from the magnetometer would help describe the interaction if the simulation were accurate. We should expect features to be much sharper but the scale sizes of the interaction might be close to correct. To ensure that the features are all captured we should designate our prime observing period to be perhaps twice this number.

A complementary series of plots showing several of the flyby trajectories through the cloud of (mass 29 hydrocarbon) pick up ions produced on the corotational upstream side has been produced by Janet Luhmann. These plots show:

View Point
INMS Hi PriorityT1, T2, T3, T5, T6, T16:Saturnabovewakeabove and to the side
INMS WakeT1, T3, T17, T20, T37, T40:Saturn/
upstream
SaturnwakeSaturn/
above
INMS RamT2, T5, T6, T16, T25, T31:Saturnupstream/
Saturn
upstreamabove/
upstream

Flyby 1.

Location: 10.61 LT; 1200 km
Time: 04/11/27 1415
Type: Wake; Family A2
Duration: -75 to 50m
Comments: Similar to first Galileo flyby of Io. F1, F4, F11 complementary

Flyby 2.

Location: 10.47 LT; 1200km
Time: 05/01/14 1014
Type: Above near wake; Family B1.5
Duration: -75 to 40m
Comments: Like Flyby 4 and 35 but different local time. Need all three to investigate Alfven wing downstream from Titan, because mass loading will vary with local time.

Flyby 3.

Location: 10.38 LT; 1189km
Time: 05/02/15 0729
Type: Wake; Family A1
Duration: -75 to 35 m
Comments: Similar to first Galileo flyby of Io. F1, F3, F11 complementary

Flyby 4.

Location: 5.30; 2600km
Time: 05/03/03 1939
Type: Above near wake; Family B1n
Duration: -40 to 40m
Comments: Like Flyby 2 and 35 but different local time. Need all three to investigate Alfven wing downstream from Titan because of local time variations in mass loading.

Flyby 5.

Location: 5.28LT; 950km
Time: 05/04/16 1855
Type: Northern Flux tube; Family C1n
Duration: -30 to 30m
Comments: First flux tube crossing; like Flyby 6 but northern hemisphere

Flyby 6.

Location: 5.00LT; 950km
Time: 05/08/22 0901
Type: Southern Flux tube; Family C1s
Duration: -30 to 30m
Comments: First flux tube crossing; like Flyby 5 but southern hemisphere

Flyby 7.

Location: 4.97LT; 4105km
Time: 05/09/07 1812
Type: Upstream below Titan; Family D1s
Duration: -50 to 20m
Comments: First upstream crossing but distant and well below Titan

Flyby 8.

Location: 9.34LT; 1468km
Time: 05/10/28 0436
Type:
Upstream in Titan equator; Family D1.5
Duration: -60 to 25m
Comments: First close upstream crossing. Similar to Flyby 10 but closer to Titan. Makes very good complementary pair with Flyby 10, also Flyby 12.

Flyby 9.

Location: 3.09LT; 10457km
Time: 05/12/26 1921
Type: Distant wake; unique
Duration: -70 to 60m
Comments:This is a critical, unique encounter and gives the only chance to study the evolution of the wake and the acceleration of the wake plasma.

Flyby 10.

Location: 8.51LT; 2052km
Time: 06/01/15 1217
Type: Upstream in Titan equator; Family D1.5
Duration: -60 to 20m
Comments: Similar to Flyby 8 but further from Titan and thus complementary. See Flyby 12 for different local time.

Flyby 11.

Location: 01.18LT; 1812km
Time: 06/02/27
Type: Wake; Family A0
Duration: -40 to 40m
Comments: This makes a good complement to Flyby 1 and 3 that are at quite different local times.

Flyby 12.

Location: 06.45; 1948km
Time: 06/03/19 0034
Type: Upstream equatorial; Family D1
Duration: -50 to 20m
Comments: Complements Flyby 8, 10 with different local time

Flyby 13.

Location: 23.24LT; 1851km
Time: 06/04/30 2127
Type: Wake; Family A0
Duration: -40 to 40m
Comments: Similar to Flyby 11. Good pair for temporal variation study.

Flyby 14.

Location: 04.44LT; 1878km
Time: 06/05/20 1246
Type: Upstream; Family D0.5
Duration: -60 to 20m
Comments: Flyby 8, 10, 12 provide complementary data at different local times. F21 and F24 provide coverage at the same local time but different distances

Flyby 15.

Location: 21.25LT; 1909km
Time: 06/07/02 0946
Type: Wake; Family A3.5
Duration: -40 to 40m
Comments: Flyby 11, 13 have similar but complementary local times; Flyby 1 and 3 are at quite different local times. This is the only pass in the local time sector and hence is very important.

Flyby 16.

Location: 02.47LT; 950km
Time: 06/07/22 0057
Type: Flux tube crossing; Family C0.5n
Duration: -40 to 30m
Comments: Very different local time than earlier flux tube crossings Flyby 5 and 6.

Flyby 17.

Location: 02.35LT; 950km
Time: 06/09/07 2038
Type: Wake; Family A0.5
Duration: -40 to 30m
Comments: Complete Flyby 1, 3, 11, 13, 15

Flyby 18.

Location: 02.30LT; 950km
Time: 06/09/23 1914
Type: Flux tube; Family C0.5n
Duration: -30 to 20m
Comments: Very similar to Flyby 16. Good for studying temporal stability of interaction

Flyby 19.

Location: 02.25LT; 950km
Time: 06/10/09 1743
Type: Flux tube; Family C0.5n
Duration: -30 to 20m
Comments: Very similar to Flyby 16, 18

Flyby 20.

Location: 02.21LT; 950km
Time: 06/10/25 1611
Type: Wake; Family A0.5
Duration: -30 to 20m
Comments: Very similar to Flyby 17. Good for studying temporal stability of wake

Flyby 21.

Location: 2.06LT; 950km
Time: 06/12/12 1155
Type: Upstream; Family D0.5h
Duration: -40 to 20m
Comments: F14 is the only other upstream pass at this local time and this pass is the closest. F24 provides some distant upstream data so that F14, F21, and F24 provide a nice spatial complement in the upstream region.

Flyby 22.

Location: 2.01LT; 950km (1500km)
Time: 06/12/28 1018
Type: Side; Family E0.5i
Duration: -40 to 20m
Comments: F22, F23, and F24 are the only flybys that pass alongside of the wake, on either side, in this local time sector. To monitor time variability obtaining both F22 and F23 is recommended

Flyby 23.

Location: 1.97LT; 950
Time: 07/01/13 0851
Type: Side; Family E0.5i
Duration: -40 to 20m
Comments: Comments: F22, F23, and F24 are the only flybys that pass alongside of the wake, on either side, in this local time sector. To monitor time variability obtaining both F22 and F23 is recommended

Flyby 24.

Location: 1.92LT; 3862km (2751 km)
Time: 07/01/29 0730
Type: Side and upstream; Family E0.5i/D0.5h
Duration: -60 to 20m
Comments: Comments: F22, F23, and F24 are the only flybys that pass alongside of the wake, on either side, in this local time sector. To monitor time variability obtaining both F22 and F23 is recommended. This pass also has high inclination and is a distant upstream encounter. It provides a good complement to F14 and F21

Flyby 25.

Location: 13.87LT; 950km
Time: 07/02/22 0324
Type: Side; Family E2.5i
Duration: -40 to 20m
Comments: Flyby trajectories suddenly switch to encountering Titan near local noon. F25, F26, F27, and F28 are all similar. All could see downstream solar wind wake if Titan enters the magnetosheath or solar wind.

Flyby 26.

Location: 13.82LT; 962km
Time: 07/03/10 0201
Type: Side; E2.5i
Duration: -35 to 20m
Comments: F25, F26, F27, and F28 are all similar. All could see downstream solar wind wake if Titan enters the magnetosheath or solar wind.

Flyby 27.

Location: 13.78LT; 950km
Time: 07/03/26 0035
Type: Side; E2.5i
Duration: -30 to 20m
Comments: F25, F26, F27, and F28 are all similar. All could see downstream solar wind wake if Titan enters the magnetosheath or solar wind.

Flyby 28.

Location: 13.73LT; 950km
Time: 07/04/26 2309
Type: Side; E2.5i
Duration: -30 to 20m
Comments: F25, F26, F27, and F28 are all similar. All could see downstream solar wind wake if Titan enters the magnetosheath or solar wind.

Flyby 29.

Location: 13.69LT; 950km
Time: 07/04/26 2142
Type: Side and flux tube; E2.5i/C2.5n
Duration: -30 to 20m
Comments: Has some flux tube and side passage. Could see downstream solar wind interaction if Titan is in the magnetosheath or solar wind

Flyby 30.

Location: 13.65LT; 3624km (950)
Time: 07/05/12 2019
Type: Distant Flux tube; C2.5n
Duration: -20 to 20m
Comments: Similar to F31, F32. Better chance of avoiding solar wind effects than on later flux tube crossings.

Flyby 31.

Location: 13.61LT; 950km
Time: 07/05/28 1856
Type: North Flux tube; C2.5n
Duration: -30 to 20m
Comments: Similar to F30, F32. Better chance of avoiding solar wind effects here than on later flux tube crossings.

Flyby 32.

Location: 13.58LT; 950km
Time: 07/06/13 1747
Type: North Flux tube; C2.5s
Duration: -30 to 20m
Comments: Similar to F30, F31. Better chance of avoiding solar wind effects here than on later flux tube crossings.

Flyby 33.

Location: 13.57LT; 1782km (1947)
Time: 07/06/29 1700
Type: Upstream; Family D2.5e
Duration: -60 to 15m
Comments: Unique upstream pass in this local time sector

Flyby 34.

Location: 18.77LT; 1304km
Time: 07/07/19 0041
Type: Upstream; Family D3e
Duration: -70 to 10m
Comments: The only pass near dusk in any family. This is a unique orbit and very important.

Flyby 35.

Location: 11.51LT; 3196km
Time: 07/08/31 0633
Type: Above near wake; Family B2n
Duration: -60 to 40m
Comments: One of only 3 members of this family and the only one at this local time. F2 is a B1.5n and F4 is a B1n. These should all all be obtained to define Alfven wing away from Titan.

Flyby 36.

Location: 11.51LT; 950km
Time: 07/10/02 0505
Type: South Flux tube ; Family C2s
Duration: -50 to 50m
Comments: F36, F38, and F39 are the only flux tube crossings near local noon. Need two of the three to ensure measurement obtained because of possible solar wind penetration.

Flyby 37.

Location: 11.41LT; 950km
Time: 07/11/19 0110
Type: Wake; Family A2
Duration: -10 to 60 m
Comments: With F1 has penetration into geometric wake but complements F1 by being in south wake while F1 is in north wake. Similar otherwise to F1, F40, F43, F44.

Flyby 38.

Location: 11.42LT; 950km
Time: 07/12/05 0041
Type: South Flux Tube; Family C2s
Duration: -20 to 30 m
Comments: F36, F38, and F39 are the only flux tube crossings near local noon. Because of the uncertain plasma environment here both are needed to ensure measurement.

Flyby 39.

Location: 11.40LT; 950km
Time: 07/12/20 2336
Type: South Flux Tube; Family C2s
Duration: -30 to 25 m
Comments: F36, F38, and F39 are the only flux tube crossings near local noon. Because of the uncertain plasma environment here two are needed to ensure measurement.

Flyby 40.

Location: 11.37LT; 950km
Time: 08/01/05 2209
Type: Wake; Family A2
Duration: -40 to 30 m
Comments: Similar to F1, F37, F40, F43, F44. Need several passes in this local time region to be sure of meeting wake objectives.

Flyby 41.

Location: 11.22LT; 950km
Time: 08/02/22 1736
Type: Side; Family E2o
Duration: -40 to 30 m
Comments: Low inclination pass that is good for studying solar wind interaction on upstream side. See also F42.

Flyby 42.

Location: 11.12LT; 950km
Time: 08/03/25 1432
Type: Side; Family E2o
Duration: -50 to 30 m
Comments: Best low inclination pass along outside of corotation wake. Good for studying solar wind interaction on upstream side. See also F41. Need both to ensure chance of measurement.

Flyby 43.

Location: 10.99LT; 950km
Time: 08/05/12 1007
Type: Side; Family E2o
Duration: -50 to 30 m
Comments: Unique. Wake crossing with highest inclination allowing clean current sheet crossing. Otherwise is similar to F1, F37, F40, F44. Need several of these to ensure measurement.

Flyby 44.

Location: 10.93LT; 1744km
Time: 08/05/28 0830
Type: Wake; Family A2
Duration: -20 to 35 m
Comments: Good coverage in wake but just misses current sheet. Good companion pass to F43. Similar to F1, F37, F40.


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Last updated: December 31, 1999