scholarly journals Project MONICA for the Study of Time-Variable Phenomena of the Jovian Sodium Cloud and the Io Plasma Torus

2001 ◽  
Vol 183 ◽  
pp. 281-282
Author(s):  
Chien-Pang Chang ◽  
Wing Ip
Keyword(s):  
Progress Report ◽  
Astronomical Observatory ◽  
Time Variable ◽  
Dust Particles ◽  
Galilean Satellite ◽  
Active Volcanism ◽  
Jovian Magnetosphere ◽  
Jovian System ◽  
Plasma Torus ◽  
Io Plasma Torus

AbstractBecause of active volcanism, large amounts of gas and dust particles are being injected from the Galilean satellite, Io, into the Jovian system. The neutral cloud of sodium atoms and the plasma torus of sulfur ions provide very useful information on Io’s interaction with the Jovian magnetosphere. A program called MONICA (Monitoring of Neutral and Ionized Atoms Clouds) was established at NCU with a view to participate in an international campaign during the flyby of the Jovian system by the Cassini spacecraft in December, 2000. Spectrographic observations were carried out using the 2.16m spectrograph of the Beijing Astronomical Observatory in Xing-Long. A progress report is presented here.

scholarly journals On the location of the Io plasma torus: Voyager 1 observations

2018 ◽  
Vol 36 (3) ◽  
pp. 831-839
Author(s):  
Martin Volwerk
Keyword(s):  
Local Time ◽  
Phase Angle ◽  
Radial Distance ◽  
The Sun ◽  
Magnetospheric Physics ◽  
Viewing Angle ◽  
Jovian Magnetosphere ◽  
Plasma Torus ◽  
Ultraviolet Observations ◽  
Io Plasma Torus

Abstract. The Voyager 1 outbound ultraviolet observations of the Io plasma torus are used to determine the location of the ansae, to obtain a third viewing angle of this structure in the Jovian magnetosphere. At an angle of -114∘ with respect to the Sun–Jupiter line, or a Jovian local time of 04:30 LT, the Voyager 1 data deliver a distance of 5.74±0.10 RJ for the approaching and 5.83±0.15 RJ for the receding ansa. Various periodicities in the radial distance, brightness and width of the ansae are seen with respect to system III longitude and Io phase angle. The torus ribbon feature does not appear in all ansa scans. Keywords. Magnetospheric physics (magnetosphere interactions with satellites and rings)

Saturn's E, G and F rings: modulated by the plasma sheet

1984 ◽  
Vol 75 ◽  
pp. 597
Author(s):  
E. Grün ◽  
G.E. Morfill ◽  
T.V. Johnson ◽  
G.H. Schwehm
Keyword(s):  
Solar Wind ◽  
Direct Contact ◽  
Transport Processes ◽  
Time Variable ◽  
Dust Particles ◽  
Spatial Diffusion ◽  
Drag Forces ◽  
Orbit Perturbation ◽  
Time Variations ◽  
F Ring

ABSTRACTSaturn's broad E ring, the narrow G ring and the structured and apparently time variable F ring(s), contain many micron and sub-micron sized particles, which make up the “visible” component. These rings (or ring systems) are in direct contact with magnetospheric plasma. Fluctuations in the plasma density and/or mean energy, due to magnetospheric and solar wind processes, may induce stochastic charge variations on the dust particles, which in turn lead to an orbit perturbation and spatial diffusion. It is suggested that the extent of the E ring and the braided, kinky structure of certain portions of the F rings as well as possible time variations are a result of plasma induced electromagnetic perturbations and drag forces. The G ring, in this scenario, requires some form of shepherding and should be akin to the F ring in structure. Sputtering of micron-sized dust particles in the E ring by magnetospheric ions yields lifetimes of 102to 104years. This effect as well as the plasma induced transport processes require an active source for the E ring, probably Enceladus.

Io plasma torus and the source of jovian narrow-band kilometric radiation

Nature ◽  
1987 ◽  
Vol 327 (6122) ◽  
pp. 492-495 ◽  
Author(s):  
Dyfrig Jones
Keyword(s):  
Narrow Band ◽  
Plasma Torus ◽  
Io Plasma Torus

scholarly journals Cassini UVIS observations of the Io plasma torus

Icarus ◽  
2008 ◽  
Vol 194 (1) ◽  
pp. 153-165 ◽  
Author(s):  
A.J. Steffl ◽  
P.A. Delamere ◽  
F. Bagenal
Keyword(s):  
Plasma Torus ◽  
Io Plasma Torus

The proton concentration in the vicinity of the Io plasma torus

1982 ◽  
Vol 87 (A12) ◽  
pp. 10395 ◽  
Author(s):  
R. L. Tokar ◽  
D. A. Gurnett ◽  
F. Bagenal
Keyword(s):  
Proton Concentration ◽  
Plasma Torus ◽  
Io Plasma Torus

Ground-based observations of the [SII] 6731 Å emission lines of the Io plasma torus

2016 ◽  
Vol 12 (S328) ◽  
pp. 227-229
Author(s):  
P. Magalhães Fabíola ◽  
Walter Gonzalez ◽  
Ezequiel Echer ◽  
Mariza P. Souza-Echer ◽  
Rosaly Lopes ◽  
...  
Keyword(s):  
Charged Particles ◽  
Emission Lines ◽  
Solar Telescope ◽  
The Moon ◽  
Active Object ◽  
Oxygen Ions ◽  
Galilean Moons ◽  
Plasma Torus ◽  
Io Plasma Torus ◽  
Galilean Moons Of Jupiter

AbstractThe Io Plasma Torus (IPT) is a doughnut-shaped structure of charged particles, composed mainly of sulfur and oxygen ions. The main source of the IPT is the moon Io, the most volcanically active object in the Solar System. Io is the innermost of the Galilean moons of Jupiter, the main source of the magnetospheric plasma and responsible for injecting nearly 1 ton/s of ions into Jupiter's magnetosphere. In this work ground-based observations of the [SII] 6731 Å emission lines are observed, obtained at the MacMath-Pierce Solar Telescope. The results shown here were obtained in late 1997 and occurred shortly after a period of important eruptions observed by the Galileo mission (1996-2003). Several outbursts were observed and periods of intense volcanic activity are important to correlate with periods of brightness enhancements observed at the IPT. The time of response between an eruption and enhancement at IPT is still not well understood.

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