Two Years of Observations of the Io Plasma Torus by Juno Radio Occultations: Results From Perijoves 1 to 15

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

doi:10.1029/2020ja028710

Cited by 7 publications

(31 citation statements)

References 40 publications

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“…R agree with previous models based on past missions (Bagenal, 1994;Bagenal et al, 1997) and with data analysis on the first PJs of Juno (Phipps et al, 2019(Phipps et al, , 2021. They are also compatible with the results from the single arc fits.…”

Section: The Values Ofsupporting

confidence: 91%

“…The resulting average is about 2,500 3 cm E . If we compare the results we obtained for PJ01, 03, 06, 08 10, 11, 14, and 15 with the work of Phipps et al (2019Phipps et al ( , 2021 sigmas. Such differences may be due different method for the removal of the background.…”

Section: Single Arc Fitsmentioning

confidence: 89%

“…For the scale height

H_{i}

, the initial values

H_{1}

= 0.2

R_{J}

and

H_{2}

= 1.0

R_{J}

were taken approximately from Phipps et al. (2019, 2021), while their respective boundaries were set at [0.05 0.4]

R_{J}

and [0.5, 1.3]

R_{J}

respectively. For the offsets, we started from

Z_{1} = Z_{2} = 0 R_{J}

with upper and lower boundary at [−0.3, 0.3]

R_{J}

.…”

Section: Methodsmentioning

confidence: 99%

“…We empirically removed this effect by fitting a nine-degree polynomial as already done in previous data analysis of Juno radio occultations (Phipps et al, 2019(Phipps et al, , 2021. We substituted the signature of the IPT with a linear interpolation between the beginning and the end of it and we used this path delay to remove the background.…”

Section: Parameter Estimationmentioning

confidence: 99%

“…Bird et al, 1993). For the scale height i fromPhipps et al (2019Phipps et al ( , 2021, while their respective boundaries were set at [0.05 0.4] distributions also for the global fits. For the axisymmetric model the initial values of in agreement with the single arc fits and they were bounded between 500 3 cm E and 5,000 3 cm E…”

mentioning

confidence: 99%

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Morphology of the Io Plasma Torus From Juno Radio Occultations

et al. 2021

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The jovian moon Io disperses about 1 ton/s of material in the planetary magnetosphere, mainly by sublimation of SO2 from the surface and by its intense volcanic activity. The ejected material supplies the plasma cloud surrounding Jupiter known as Io Plasma Torus (IPT). The radio communication between Juno and the Earth DSN station crosses the IPT near the closest approach. Being a dispersive medium, the IPT introduces a path delay in the signal, which can be analyzed to retrieve the density distribution of electrons. We used radio tracking data from the first 25 orbits to investigate the morphology of the IPT and its variability. We adopted a static and axisymmetric model for the electron density and we updated it including temporal and longitudinal variability. We found that our best fit model must include both variabilities, even though on average the morphology of the IPT agrees with previous analyses. Our results suggest that the density of the outer region of the IPT fluctuates over 50% the average value over a typical time scale of about 420 days.

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