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Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale
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SYSNO ASEP 0561095 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Observations of the First Harmonic of Saturn Kilometric Radiation During Cassini's Grand Finale Author(s) Wu, S. (CN)
Zarka, P. (FR)
Lamy, L. (FR)
Taubenschuss, Ulrich (UFA-U) RID, ORCID
Cecconi, B. (FR)
Ye, S. (CN)
Fischer, G. (AT)
Kurth, W. S. (US)
Francez, T. (FR)Number of authors 9 Article number e2022JA030776 Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 127, č. 9 (2022)Number of pages 12 s. Language eng - English Country US - United States Keywords electron-cyclotron maser ; auroral radio emissions ; source region ; generation ; acceleration Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GF20-06802L GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 000850891100001 EID SCOPUS 85139061512 DOI 10.1029/2022JA030776 Annotation Clear first harmonic emissions of Saturn Kilometric Radiation are discovered during the Cassini Grand Finale orbits. Both ordinary (O) and extraordinary (X) mode fundamental emissions accompanied by X mode harmonics are observed. Analysis shows that the frequency ratio between the fundamental and harmonic emissions is 2.01 +/- 0.08, and the harmonic emissions display weaker intensities than the fundamental, by 30-40 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 patterns that we attribute to different conditions of emission at the source. Direction-finding results shows that the fundamental and harmonic emissions are plausibly generated in the same source region. In agreement with previous studies at Earth, the generation of the two types of harmonics can be attributed to the cyclotron maser instability operating with different plasma density and electron energy distributions in the source region. Workplace 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 2023 Electronic address https://hal.science/hal-03807514/document
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