Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno
Abstract Juno performed close flybys of the innermost Galilean moon, Io, in December 2023 (I57) and February 2024 (I58). During these flybys, the radio link connecting the Juno spacecraft to Earth observing stations of NASA's Deep Space Network (DSN) propagated through the Alfvén wing, a magnet...
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Wiley
2025-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL111568 |
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| author | D. R. Buccino A. Caruso D. Coffin L. Gomez‐Casajus M. Parisi M. Zannoni E. Gramigna P. Withers P. Tortora R. S. Park P. Steffes S. Bolton |
| author_facet | D. R. Buccino A. Caruso D. Coffin L. Gomez‐Casajus M. Parisi M. Zannoni E. Gramigna P. Withers P. Tortora R. S. Park P. Steffes S. Bolton |
| author_sort | D. R. Buccino |
| collection | DOAJ |
| description | Abstract Juno performed close flybys of the innermost Galilean moon, Io, in December 2023 (I57) and February 2024 (I58). During these flybys, the radio link connecting the Juno spacecraft to Earth observing stations of NASA's Deep Space Network (DSN) propagated through the Alfvén wing, a magnetospheric feature in which plasma is produced between Io and Jupiter. The radio link is sensitive to the elevated electron densities in the Alfvén wing. A direct measurement of the total electron content was made by a linear combination of Juno's X‐band and Ka‐band downlink frequencies. Two different approaches were used in inverting the measurements into electron densities which assume different electron density distributions within the Alfvén wing. The maximum electron densities estimated in the Alfvén wing were 20,500–27,000 cm−3 on I57, in the northern Alfvén wing, and 15,300–31,000 cm−3 on I58, in the southern Alfvén wing. |
| format | Article |
| id | doaj-art-ecbab3c1b97f44d38b7f1e9dae1402a0 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-ecbab3c1b97f44d38b7f1e9dae1402a02025-08-20T03:09:49ZengWileyGeophysical Research Letters0094-82761944-80072025-02-01524n/an/a10.1029/2024GL111568Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With JunoD. R. Buccino0A. Caruso1D. Coffin2L. Gomez‐Casajus3M. Parisi4M. Zannoni5E. Gramigna6P. Withers7P. Tortora8R. S. Park9P. Steffes10S. Bolton11Jet Propulsion Laboratory California Institute of Technology Pasadena CA USADepartment of Industrial Engineering Alma Mater Studiorum ‐ Università di Bologna Bologna ItalyBoston University Boston MA USADepartment of Industrial Engineering Alma Mater Studiorum ‐ Università di Bologna Bologna ItalyJet Propulsion Laboratory California Institute of Technology Pasadena CA USADepartment of Industrial Engineering Alma Mater Studiorum ‐ Università di Bologna Bologna ItalyDepartment of Industrial Engineering Alma Mater Studiorum ‐ Università di Bologna Bologna ItalyBoston University Boston MA USADepartment of Industrial Engineering Alma Mater Studiorum ‐ Università di Bologna Bologna ItalyJet Propulsion Laboratory California Institute of Technology Pasadena CA USASchool of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USASouthwest Research Institute San Antonio TX USAAbstract Juno performed close flybys of the innermost Galilean moon, Io, in December 2023 (I57) and February 2024 (I58). During these flybys, the radio link connecting the Juno spacecraft to Earth observing stations of NASA's Deep Space Network (DSN) propagated through the Alfvén wing, a magnetospheric feature in which plasma is produced between Io and Jupiter. The radio link is sensitive to the elevated electron densities in the Alfvén wing. A direct measurement of the total electron content was made by a linear combination of Juno's X‐band and Ka‐band downlink frequencies. Two different approaches were used in inverting the measurements into electron densities which assume different electron density distributions within the Alfvén wing. The maximum electron densities estimated in the Alfvén wing were 20,500–27,000 cm−3 on I57, in the northern Alfvén wing, and 15,300–31,000 cm−3 on I58, in the southern Alfvén wing.https://doi.org/10.1029/2024GL111568JunoJupiterIoAlfvenmagnetosphere |
| spellingShingle | D. R. Buccino A. Caruso D. Coffin L. Gomez‐Casajus M. Parisi M. Zannoni E. Gramigna P. Withers P. Tortora R. S. Park P. Steffes S. Bolton Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno Geophysical Research Letters Juno Jupiter Io Alfven magnetosphere |
| title | Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno |
| title_full | Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno |
| title_fullStr | Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno |
| title_full_unstemmed | Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno |
| title_short | Electron Density in Io's Alfvén Wing Observed Via Radio Occultation With Juno |
| title_sort | electron density in io s alfven wing observed via radio occultation with juno |
| topic | Juno Jupiter Io Alfven magnetosphere |
| url | https://doi.org/10.1029/2024GL111568 |
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