Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale

Siyuan Wu; Philippe Zarka; Laurent Lamy; Ulrich Taubenschuss; Baptiste Cecconi; Shengyi Ye; Georg Fischer; William Kurth; Théo Francez

doi:10.1029/2022JA030776

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Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale

Journal article

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Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale

Siyuan Wu, Philippe Zarka, Laurent Lamy, Ulrich Taubenschuss, Baptiste Cecconi, Shengyi Ye, Georg Fischer, William Kurth and Théo Francez

Journal of geophysical research. Space physics, Vol.127(9), e2022JA030776

09/2022

DOI: 10.1029/2022JA030776

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Abstract

Clear first harmonic emissions of Saturn Kilometric Radiation are discovered during the CassiniGrand Finale orbits. Both ordinary (O) and extraordinary (X) mode fundamental emissions accompanied by Xmode harmonics are observed. Analysis shows that the frequency ratio between the fundamental and harmonicemissions is 2.01 ± 0.08, and the harmonic emissions display weaker intensities than the fundamental, by30–40 dB for the X-X (fundamental-harmonic) type harmonic and 10–30 dB for the O-X type harmonic.The intensity relations between the two types of harmonics, that is, O-X and X-X show different patternsthat we attribute to different conditions of emission at the source. Direction-finding results shows that thefundamental and harmonic emissions are plausibly generated in the same source region. In agreement withprevious studies at Earth, the generation of the two types of harmonics can be attributed to the cyclotron maserinstability operating with different plasma density and electron energy distributions in the source region.

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Details

Title: Subtitle: Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale
Creators: Siyuan Wu - Southern University of Science and Technology
Philippe Zarka - Laboratoire d’études spatiales et d’instrumentation en astrophysique
Laurent Lamy - Université Paris Cité
Ulrich Taubenschuss - Institute of Atmospheric Physics
Baptiste Cecconi - Université Paris Cité
Shengyi Ye - Southern University of Science and Technology
Georg Fischer - Space Research Institute
William Kurth - University of Iowa
Théo Francez - Université Paris Cité
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.127(9), e2022JA030776
DOI: 10.1029/2022JA030776
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: American Geophysical Union/Wiley
Grant note: DOI: 10.13039/501100002830, name: Centre National d’Etudes Spatiales
Language: English
Date published: 09/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9984455558002771

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