IV Orbit and Operation

IV.1 The Current JAXA Plan

At the current JAXA plan, the JMO is conveyed with JGO as a single cruise composite to the Jupiter. Just after the Jovian orbit insertion, the JMO is searated and start the standalone orbit control including the satellite flybys.

(1) INITIAL orbit: just after the release from Cruise Composite (JMO + JGO)

-Apoapsis :	50 - 100Rj
-Periapsis :	Io Orbit 	(& Multiple flybys to Io / Europa / Ganymede)
-Local time :	TBD		(planned with JGO)
-Inclination : Equatorial
-Option :      Multiple satellite flybys

(2) NOMINAL orbit

-Apoapsis :    50 - 100Rj
-Periapsis :   Europa or Ganymede Orbit
-Local time :  TBD	
-Inclination	Equatorial
-Option :      Multiple satellite flybys

(3) FINAL orbit (as an option)

-Apoapsis :    50-100Rj
-Periapsis : 	Europa or Ganymede Orbit
-Local time :	TBD	
-Inclination :	Highly inclination changed by Europa or Ganymede flyby (The inclination with 15-30deg might be possible.)

(4) Solar Wind monitoring (as an option)

It is the most important problem. If the JMO is used as a solar wind monitor, it requires much large apoapsis, and huge fuel if we change the apoapsis to be smaller.

  • Option-1: The JMO = Solar Wind Monitor. Initial orbit is with much larger apoapsis. In the Jovian system, JGO and/or JEO will act as In-situ & Remote-sensing points. (Demerit: Large dV & Huge fuel for JMO)
  • Option-2: Other orbiter acts as a Solar Wind Monitor. After the insertion of the JMO into the Jovian system, other cruise composite will arrive at Jupiter. In the cruise phase, it acts as a solar wind monitor. (Demerit: Good schedule coordination)
  • Option-3: No solar wind monitor. We expect the progress of future space-weather researches which realize the good estimation of solar wind condition, at least the velocity & total pressure of the solar wind at Jupiter. (Magnetic field estimation is much difficult.)

(Ed. Yasumasa Kasaba: June 15 2008)

IV.2 Proposal

From the Galileo experience, I suggest to study a JMO orbit with apojoves further out than 28 RJ since there are a lot of processes going on beyond that distance. In addition the corotation breakdown is a function of local time and is further out at dawn compared to dusk.

(Ed. Norbert Krupp : June 10 2008)

  • Perijove <= 15 Rj, apojove > 100 Rj
  • Inclined orbits to map the magnetosphere at higher latitudes
  • Solar wind monitoring (apojove > 100 Rj) when JMO and JEO inside the magnetosphere
  • If possible, include some flybys of Ganymede and Callisto (when JGO will orbit Ganymede, I assume JMO will avoid the inner regions because of the radiation environment)

(Ed. Nicolas Andre, nandre AT rssd.esa.int : June 11 2008)

It would be interesting to have an orbit in the dusk region with apojoves up to 170-200 RJ in order to study the thinning of the plasma sheet and to find out if this thinning will lead to the reconnection and formation of the x-line in this region. It is expected to observe a continuation of the x-line located in the dawn region, which is derived using Galileo data but due to the thickness of the plasma sheet it is anticipated much further from the planet than in the dawn region.

(Ed. Elena Kronberg : June 25 2008)

From the global magnetospheric simulation results, the configuration of corotation region is controlled by the both Jovian inner processes and the solar wind dynamic pressure. Also the IMF controls the location of tail reconnection. To distinguish the origin of magnetospheric dynamics, it is necessary to monitor the solar wind and Jovian magnetosphere simultaneously.

(Ed. Keiichiro Fukazawa : July 1 2008)

[any inputs!]

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Last-modified: 2008-07-01 (Tue) 00:46:41 (4252d)