Skip to Main content Skip to Navigation
Journal articles

First Report of Electron Measurements During a Europa Footprint Tail Crossing by Juno

Abstract : We report the first in situ observations of electron measurements at a Europa footprint tail (FPT) crossing in the auroral region. During its 12th science perijove pass, Juno crossed magnetic field lines connected to Europa's FPT. We find that electrons in the range ~0.4 to ~25 keV, with a characteristic energy of 3.6 ± 0.5 keV, precipitate into Jupiter's atmosphere to create the footprint aurora. The energy flux peaks at ~36 mW/m2, while the peak ultraviolet (UV) brightness is estimated at 37 kR. We estimate the peak electron density and temperature to be 17.3 cm-3 and 1.8 ± 0.1 keV, respectively. Using magnetic flux shell mapping, we estimate that the radial width of the interaction at Europa's orbit spans roughly 3.6 ± 1.0 Europa radii. In contrast to typical Io FPT crossings, the instrument background caused by penetrating energetic radiation (> ~5-10 MeV electrons) increased during the Europa FPT crossing.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03673124
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, June 24, 2022 - 4:32:24 PM
Last modification on : Monday, July 4, 2022 - 9:01:30 AM

File

Geophysical Research Letters -...
Publisher files allowed on an open archive

Licence

Copyright

Identifiers

Collections

Citation

F. Allegrini, G. R. Gladstone, V. Hue, G. Clark, J. R. Szalay, et al.. First Report of Electron Measurements During a Europa Footprint Tail Crossing by Juno. Geophysical Research Letters, 2020, 47, ⟨10.1029/2020GL089732⟩. ⟨insu-03673124⟩

Share

Metrics

Record views

11

Files downloads

1