The magnetic field and magnetosphere of Ganymede

Kivelson, M. G.; Khurana, K. K.; Coroniti, F. V.; Joy, S. P.; Russell, C. T.; Walker, R. J.; Warnecke, Jörn; Bennett, L.; Polanskey, C.

doi:10.1029/97gl02201

Cited by 140 publications

(114 citation statements)

References 9 publications

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“…Ganymede, Jupiter's third Galilean satellite, has an internal magnetic dipole (Kivelson et al 1996(Kivelson et al , 1997) strong enough to create its own mini-magnetosphere inside of Jupiter's larger one (Gurnett et al 1996, Kivelson et aL 1996. Magnetopause crossings were identified in the Galileo magnetometer data (Kivelson et al 1992) acquired during flybys of Ganymede (Kivelson et al 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Magnetopause crossings were identified in the Galileo magnetometer data (Kivelson et al 1992) acquired during flybys of Ganymede (Kivelson et al 1997). Williams et al (1997a) used data from the Energetic Particle Detector (EPD) (Williams et al 1992) Ganymede's internal structure appears to include a metallic core, a rocky mantle and an icy outer layer, a model inferred from measurements of the gravitational moments (Anderson et al, 1996) and magnetic data , McKinnon 1997).…”

Section: Introductionmentioning

confidence: 99%

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The Permanent and Inductive Magnetic Moments of Ganymede

Kivelson

Khurana

Volwerk

2002

Icarus

372

418

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Permanent and Inductive Magnetic Moments of Ganymede

Kivelson

Khurana

Volwerk

2002

Icarus

372

418

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show abstract

“…It does not account for outdiffusion of trapped oxygen, nor the mismatch of band shapes and depths, nor an insufficient flux of bombarding ions. The latter difficulty became apparent after the discovery of a magnetic field at Ganymede by the Galileo probe [Kivelson et al, 1996[Kivelson et al, , 1997Williams et al, 1997]. This field likely prevents most of the magnetospheric ions from reaching the satellite except near polar latitudes, which is where condensed (02) 2 was not detectable.…”

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confidence: 99%

Laboratory studies of the optical properties and stability of oxygen on Ganymede

Baragiola¹,

Bahr²

1998

J. Geophys. Res.

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Abstract. We present measurements of the optical properties of solid 02 and O2:H20 films and on the stability of oxygen in water ice at different temperatures. The experiments are meant to test hypotheses for the location of condensed molecular oxygen in Ganymede. We find that oxygen is not retained in water ice at Ganymede's recorded surface temperatures and analyze current questions associated with the existence of oxygen in this Jovian moon. The results suggest that solid oxygen and possibly other condensed gases exist on cold patches on the heterogeneous Ganymede's surface.

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“…The presence of a global magnetic field at Ganymede was inferred from the detection of the electromagnetic and electrostatic waves and radio emissions as the Galileo spacecraft approached Ganymede (Gurnett et al, 1996) and was later confirmed by Galileo's magnetometer data during closer flybys of the moon. These data have shown that Ganymede has an intrinsic magnetic field strong enough to generate a mini-magnetosphere (diameter 4-5 R G , R G is radius of Ganymede = 2631 km) embedded within the Jovian magnetosphere (Kivelson et al, 1996(Kivelson et al, , 1997(Kivelson et al, , 1998. A model with a fixed Ganymede-centered dipole superimposed on the Jovian ambient field provided a good first-order match to the data and suggested equatorial and polar field strengths at Ganymede's surface of 750 and 1200 nT, respectively.…”

Section: Introductionmentioning

confidence: 73%

“…240 A. K. Tripathi et al: The generation of Ganymede's diffuse aurora Data obtained from Galileo encounters have provided a large amount of new information about the moon. These include the discovery and verification of Ganymede's magnetic field, its magnetosphere, its trapped particle population, its interaction with the Jovian environment and plasma waves associated with Ganymede (Gurnett et al, 1996;Kivelson et al, 1996Kivelson et al, , 1997Kivelson et al, , 1998Frank et al, 1997;Williams et al, 1997aWilliams et al, , b, 1998Williams and Mauk, 1997). The presence of a global magnetic field at Ganymede was inferred from the detection of the electromagnetic and electrostatic waves and radio emissions as the Galileo spacecraft approached Ganymede (Gurnett et al, 1996) and was later confirmed by Galileo's magnetometer data during closer flybys of the moon.…”

Section: Introductionmentioning

confidence: 91%

The generation of Ganymede's diffuse aurora through pitch angle scattering

2017

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Abstract. Diffuse auroral intensities of neutral atomic oxygen OI λ1356 Å emission on Ganymede due to whistler mode waves are estimated. Pitch angle diffusion of magnetospheric electrons into the loss cone due to resonant wave-particle interaction of whistler mode waves is considered, and the resulting electron precipitation flux is calculated. The analytical yield spectrum approach is used for determining the energy deposition of electrons precipitating into the atmosphere of Ganymede. It is found that the intensities (4-30 R) calculated from the precipitation of magnetospheric electrons observed near Ganymede are inadequate to account for the observational intensities ( ≤ 100 R). This is in agreement with the conclusions reached in previous works. Some acceleration mechanism is required to energize the magnetospheric electrons. In the present work we consider the heating and acceleration of magnetospheric electrons by electrostatic waves. Two particle distribution functions (Maxwellian and kappa distribution) are used to simulate heating and acceleration of electrons. Precipitation of a Maxwellian distribution of electrons can produce about 70 R intensities of OI λ1356 Å emission for electron temperature of 150 eV. A kappa distribution can also yield a diffuse auroral intensity of similar magnitude for a characteristic energy of about 100 eV. The maximum contribution to the estimated intensity results from the dissociative excitation of O 2 . Contributions from the direct excitation of atomic oxygen and cascading in atomic oxygen are estimated to be only about 1 and 2 % of the total calculated intensity, respectively. The findings of this work are relevant for the present JUNO and future JUICE missions to Jupiter. These missions will provide new data on electron densities, electron temperature and whistler mode wave amplitudes in the magnetosphere of Jupiter near Ganymede.

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The magnetic field and magnetosphere of Ganymede

Cited by 140 publications

References 9 publications

The Permanent and Inductive Magnetic Moments of Ganymede

The Permanent and Inductive Magnetic Moments of Ganymede

Laboratory studies of the optical properties and stability of oxygen on Ganymede

The generation of Ganymede's diffuse aurora through pitch angle scattering

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