Reflection and Refraction of the L-O Mode 5 kHz Saturn Narrowband Emission by the Magnetosheath.
Geophys Res Lett
; 49(5): e2021GL096990, 2022 Mar 16.
Article
em En
| MEDLINE
| ID: mdl-35859935
ABSTRACT
The reflection-by-sheath mechanism of 5 kHz narrowband emissions (NB) at Saturn is confirmed by Cassini observations during several crossings of the magnetopause, which show that the 5 kHz NB can be prevented from escaping Saturn's magnetosphere. The L-O mode 5 kHz NB remained visible in areas of low plasma density but disappeared in regions of high plasma density. In three cases, NB disappeared immediately after the crossings of Saturn's magnetopause. A possible reflected NB event observed near the magnetosheath is discussed. This mechanism can help explain the 5 kHz NB observed at low latitudes outside the Enceladus plasma torus and their upper frequency limit variations. This mechanism significantly improves the current understanding of the 5 kHz NB.
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MEDLINE
Idioma:
En
Revista:
Geophys Res Lett
Ano de publicação:
2022
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Article