Distribution of Plasma in the Io Plasma Torus as Seen by Radio Occultation During <i>Juno</i> Perijove 1

Phipps, P. H.; Withers, Paul; Buccino, Dustin; Yang, Yajun

doi:10.1029/2017ja025113

Cited by 22 publications

(105 citation statements)

References 39 publications

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“…Results of Juno radio occultation observations of the IPT have been reported by Phipps et al. (2018) and Phipps et al. (2019) for four Juno perijoves (PJ).…”

Section: Observations By Juno Radio Occultationsmentioning

confidence: 52%

“…As explained in detail in Phipps et al. (2018) and Phipps et al. (2019), the observed differential Doppler shift is integrated with respect to time to yield an initial time series of the TEC along the Juno‐Earth line of sight.…”

Section: Observations By Juno Radio Occultationsmentioning

confidence: 99%

“…The fitted locations and their uncertainties from Phipps et al. (2018, 2019) are shown in Table 2. IPT properties from later perijoves have not yet been determined.…”

Section: Observations By Juno Radio Occultationsmentioning

confidence: 99%

“…This convention is adopted for consistency with the reference Io torus models of Phipps and Withers (2017) and Phipps et al. (2018, 2019). The JRM09 dipole parameters are stated for reference only.…”

Section: Predictions Based On Magnetic Field Modelsmentioning

confidence: 99%

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Where Is the Io Plasma Torus? A Comparison of Observations by Juno Radio Occultations to Predictions From Jovian Magnetic Field Models

et al. 2020

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The Io plasma torus is thought to lie in Jupiter's centrifugal equator, a location that depends on Jupiter's rotation and magnetic field. Yet previous observations and predictions of the location of the Io plasma torus are inconsistent. Here we test the hypothesis that the Io plasma torus lies in the centrifugal equator by comparison of observations by Juno radio occultations to predictions derived from Juno‐era magnetic field models. These observations determine the locations of two torus components: The cold torus is centered near 5.3 Jovian radii (RJ), and the “torus beyond 5.5 RJ,” dominated by the warm torus, is centered near 5.9 RJ. The observations deviate by 1–2° from the planar centrifugal equator expected for a Voyager epoch dipolar magnetic field. In each observation, the locations of distinct torus regions differ by as much as 1° indicating significant radial structure. The root‐mean‐square error between observation and prediction is smaller for predictions from the JRM09 magnetic field model than for predictions from the VIP4 magnetic field model, confirming the JRM09 model is an improvement over the VIP4 model. Agreement between observations and predictions improves for the warm torus if the magnetic field contributions of a nominal magnetospheric current sheet model are included but worsens for the cold torus. Magnetic field conditions around 5.3 RJ are adequately represented by an internal field model without the current sheet. Conditions around 5.9 RJ require internal and external contributions. These results place constraints on properties of the magnetospheric current sheet during the Juno epoch.

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“…Results of Juno radio occultation observations of the IPT have been reported by Phipps et al. (2018) and Phipps et al. (2019) for four Juno perijoves (PJ).…”

Section: Observations By Juno Radio Occultationsmentioning

confidence: 52%

Section: Observations By Juno Radio Occultationsmentioning

confidence: 99%

“…The fitted locations and their uncertainties from Phipps et al. (2018, 2019) are shown in Table 2. IPT properties from later perijoves have not yet been determined.…”

Section: Observations By Juno Radio Occultationsmentioning

confidence: 99%

Section: Predictions Based On Magnetic Field Modelsmentioning

confidence: 99%

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Where Is the Io Plasma Torus? A Comparison of Observations by Juno Radio Occultations to Predictions From Jovian Magnetic Field Models

et al. 2020

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“…For each Earth received time, and hence each line of sight, z is defined as the z coordinate of the point along the Juno‐Earth line of sight whose value of

\sqrt{((), x^{2} + y^{2})}

equals 5.89 R J , the orbital distance of Io. Here x , y , and z are expressed in the centrifugal coordinate system introduced in section 2 of Phipps et al (). This position coordinate can be considered as the distance above the centrifugal equator at which the line of sight encounters the torus.…”

Section: Fit Of Two Gaussian Functions To Tec Datamentioning

confidence: 99%

Variations in the Density Distribution of the Io Plasma Torus as Seen by Radio Occultations on Juno Perijoves 3, 6, and 8

et al. 2019

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The atmosphere of the Jovian satellite Io is constantly being lost to the surrounding magnetosphere of Jupiter. The material is ionized and then distributed by Jupiter's magnetic field into a torus around Jupiter called the Io plasma torus. This plasma affects radio signals as they propagate from the Juno spacecraft to Earth during the spacecraft's perijove passes. During Perijoves 3, 6, and 8 we determine the total electron content in the Io plasma torus using two‐way tracking data from Juno. We find that the location of the torus is displaced from predictions that use the VIP4 offset tilted dipole approximation. The displacements are consistent with those found in ground‐based observations. The peak total electron content and scale height are found for two different regions of the torus, the cold inner torus and a warmer torus beyond 5.5 RJ. Properties of the cold torus vary appreciably with System III longitude, but properties of the torus beyond 5.5 RJ do not.

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The Europa Clipper Gravity and Radio Science Investigation

et al. 2023

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The primary objective of the Europa Clipper mission is to assess the habitability of Europa, an overarching goal that rests on improving our understanding of Europa’s interior structure, composition, and geologic activity. Here we describe the Gravity and Radio Science (G/RS) investigation. The primary measurement, the gravitational tidal Love number $k_{2}$ k 2 , will be an independent diagnostic of the presence of a global subsurface ocean, but G/RS will make a number of other key measurements related to Europa’s deep interior, silicate mantle-ocean interface, ice shell, ionosphere, and plasma environment. Although radio science is common to many missions, Europa Clipper’s orbit and spacecraft configuration during flybys present special challenges for the design of this experiment. The information obtained through G/RS will be complementary to the measurements by the other instruments onboard Europa Clipper, and their combined analysis will refine the geophysical understanding of Europa necessary to best assess its potential habitability.

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Distribution of Plasma in the Io Plasma Torus as Seen by Radio Occultation During Juno Perijove 1

Cited by 22 publications

References 39 publications

Where Is the Io Plasma Torus? A Comparison of Observations by Juno Radio Occultations to Predictions From Jovian Magnetic Field Models

Where Is the Io Plasma Torus? A Comparison of Observations by Juno Radio Occultations to Predictions From Jovian Magnetic Field Models

Variations in the Density Distribution of the Io Plasma Torus as Seen by Radio Occultations on Juno Perijoves 3, 6, and 8

The Europa Clipper Gravity and Radio Science Investigation

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