GALILEO PWS GANYMEDE 8 OBSERVATION PLANNING

What's new (20 July 1995)

An overview of the G8 encounter period

Orbit geometry

And 1-day summaries for greater detail:

• Day ---
• Day ---
• Day ---
• Day ---
• Day ---
• Day ---
• Day ---
• Day ---

Magnetospheric Survey, R > 50 Rj

Spectrum Analyzer Mode:

• Antenna: Cycle (toggles between E and B every 18.67 s)

Wideband Mode: (This is mostly irrelevant since little or no wideband data will be obtained in the Magnetospheric Survey--only occasional fill data)

• Antenna: E
• Mode: 1 (10 kHz)

Magnetospheric Survey, R < 50 Rj

Encounter Geometry

Spectrum Analyzer Mode:

• Antenna: Cycle (toggles between E and B every 18.67 s)

Wideband Mode: (This is mostly irrelevant since little or no wideband data will be obtained in the Survey--only occasional fill data and data which is automatically recorded with remote sensing recorded observations)

• Antenna: E
• Mode: 2 (80 kHz)

---

Quarter Revolution Trans-Auroral Observation

Record for ~150 minutes beginning at about 23:30 on day 126 (6 May) 1997 at a distance of ~ 21 Rj. This interval begins 2.44 Rj below the magnetic equator and ends when the spacecraft is about 2.49 Rj above (north) of the magnetic equator. Here is the location of Galileo at the center of this observation.

Record LPW from 97-Day 126, 6 May/23:30:-- - 02:00:-- (Day 127, 7 May)

Spectrum Analyzer Mode:

• Antenna: Cycle (toggles between E and B every 18.67 s)

Wideband Mode:

• Antenna: 4 minutes E, followed by 1 minute B (looper)
• Mode: 1 (10 kHz)

Playback Strategy:

Return LPW (Golay) wideband data at a rate of 2:1 by returning every other waveform snapshot for 105 minutes of the interval centered on the magnetic equator; return LPW Golay wideband data at a rate of 4:1 by returning every 4th waveform snapshot for the remaining 45 minutes of the interval at the highest latitudes at the beginning and end of the interval. This plan may be modified upon analysis of RTS data.

Ganymede Closest Approach

Closest approach geometry

Record LPW for ~45 minutes beginning at about 15:35 on day 127 (7 May) 1997.

Record LPW from 97-Day 127 (7 May)/15:34:30 - 16:19:30 

Spectrum Analyzer Mode:

• Antenna: Cycle (toggles between E and B every 18.67 s)

Wideband Mode:

• Antenna: Toggle E and B once per 18.67 sec (28 mf) (Note: the E/B looper has to be constructed in such a way as to have an integer number of steps per RIM or 2-RIM pair, and must have an integer number of 14-mf steps to assure that the commands are executed on the appropriate (odd or even?) mf--as we did in the Io torus.)
• Mode: 3 (1 kHz)

Playback Strategy:

Return LPW (Golay) wideband data at a rate of 2:1 by sending back every other waveform snapshot.

---

william-kurth@uiowa.edu