Jupiter Distant Encounter Scientific Investigations

Jupiter is a prolific source of radio waves, energetic charged particles, dust and neutral gas, all of which can be detected by Ulysses. Simultaneous measurements of the solar wind and magnetic field will provide the nearly instantaneous conditions affecting Jupiter’s magnetosphere and influencing the production of these emissions. Remote sensing observations by other missions or observers are encouraged to investigate the effect of changing solar wind conditions and structures on Jupiter’s dynamic magnetosphere.

Quasi- periodic Radio Emissions

Observed by Ulysses in Dusk Sector
Period ~ 40 Min.
Science Questions:
• Local Time, Latitude Dependences?
• Beaming Pattern?
• Effect of solar wind variability?

Contact Bob MacDowall (Unified Radio and Plasma Waves)

Relativistic Electrons

Energies: 1 -10 MeV
Periodicities: 5, 10 Hours, 40 Min.
Able to access Inner Heliosphere
Science questions:
• Location of magnetospheric source?
• Escape mechanism, e.g., reconnection?
• Heliospheric propagation and diffusion coefficients?

Contact Bruce McKibben (Cosmic Ray & Solar Particles Investigation)

Dust

First observed by Ulysses in dusk sector
Periodicity ~ 27 days
Science Questions:
Source? Dust Disk? Gossamer Ring?
•Cause of periodicity? Sector Structure of Heliospheric magnetic field? Magnetospheric periodicities?

Contact Harald Krueger (Dust)

Neutral Particles

First Observed by Ulysses.
Source at Io.
Source Strength ~ 10 28 sec -1 .
Science Questions:
• Latitude, Local Time dependence?
• Cause of source strength variability?

Contact Manfred Witte (Interstellar Gas)

Solar Wind
Influence of solar wind structures on magnetosphere observed.
Speed correlated with Q-P radio bursts.
Density correlated with bKOM.
Science questions:
• Effect of CMEs on magnetosphere?
Recent large solar events in October.

Contact Dave McComas (Solar Wind Observations Over the Poles of the Sun)

Contact George Gloeckler (Solar Wind Ion Composition Spectrometer)

Energetic Particles
Low energy electrons, protons seen upstream to ~ 1000 Jupiter radii.
Science Questions:
Magnetospheric Source? Auroral regions?
Latitude, local time dependence?
Effect of solar wind CIRs, CRRs?

Contact Louis Lanzerotti (Heliosphere Instrument for Spectra, Composition and Anisotropy at Low Energies)

Contact Norbert Krupp (Energetic Particles Composition)

Magnetic Field
Effect of HMF on Jovian emissions:
On dust and relativistic electrons,
On the Access of relativistic electrons to Inner Heliosphere,
Hydromagnetic waves generated by streaming relativistic electrons.
Science questions:
• Cross-field diffusion of Jovian electrons inside CRRs?
• Region of hydromagnetic wave generation?
• Dust periodicities associated with sector structure?

Contact Andre Balogh (Magnetic Fields)