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Juno Plasma Wave Observations at Europa
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SYSNO ASEP 0580523 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Juno Plasma Wave Observations at Europa Author(s) Kurth, W. S. (US)
Wilkinson, D. R. (US)
Hospodarsky, G. B. (US)
Santolík, Ondřej (UFA-U) RID, ORCID
Averkamp, T. F. (US)
Sulaiman, A. H. (US)
Menietti, J. D. (US)
Connerney, J. E. P. (US)
Allegrini, F. (US)
Mauk, B.H. (US)
Bolton, S.J. (US)Number of authors 11 Article number e2023GL105775 Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 50, č. 24 (2023)Number of pages 9 s. Language eng - English Country US - United States Keywords Europa ; plasma waves ; magnetospheric interaction ; dust Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 001129066900001 EID SCOPUS 85180673255 DOI https://doi.org/10.1029/2023GL105775 Annotation Juno passed by Europa at an altitude of 355 km on 29 September, day 272, 2022. As one of Juno's in situ science instruments, the Waves instrument obtained observations of plasma waves that are essential contributors to Europa's interaction with its environment. Juno observed chorus, a band at the upper hybrid frequency providing the local plasma density, and electrostatic solitary structures in the wake. In addition, impulses due to micron-sized dust impacts on Juno were recorded with a local maximum very close to Europa. The peak electron density near Europa was similar to 330 cm-3 while the surrounding magnetospheric density was in the range of 50-150 cm-3. There was a significant separation between the Europa flyby and Juno's crossing of Jupiter's magnetic equator, enabling a unique identification of effects associated with the moon as opposed to magnetospheric phenomena normally occurring at the magnetic equator near 10 Jovian radii.
Plasma waves are electromagnetic fields occurring in a plasma due to motions of the charged particles comprising the plasma. These waves can arise at various locations and at a range of frequencies depending on many factors, such as the number density of charged particles and the strength of the magnetic field. Here we discuss plasma waves observed by Juno during its 355-km flyby of Europa on 29 September 2022. Some waves, called upper hybrid resonance emissions can provide information on the plasma density. Other waves, called electrostatic solitary waves are indicative of electron beams in the plasma. And yet other waves, called whistler-mode chorus, are important in the interchange of energy between electrons and the waves, resulting in the acceleration of the electrons. Each of these types of waves were observed near Europa by the Juno plasma wave instrument and they are diagnostic of Europa's interaction with the Jovian magnetosphere. The Waves instrument also detects electrical impulses due to the collision of the spacecraft with dust grains moving at over 23 km/s that allow a determination of the concentration of dust near Europa.
Two chorus bands, electrostatic solitary waves and upper hybrid emissions are observed at EuropaPlasma densities near Europa derived from the upper hybrid resonance frequency peak near the wake axis at about 330 cm-3Micron-sized dust impacts peak near closest approach to EuropaWorkplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2024 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL105775
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