Statistical Study on Spatial Distribution and Polarization of Saturn Narrowband Emissions

Wu, Siyuan1; Ye, Shengyi1; Fischer, Georg2; Wang, Jian1; Long, Minyi3; Menietti, John D.4; Cecconi, Baptiste5; Kurth, William S.4

2021-09-01

10.3847/1538-4357/ac0af1

ASTROPHYSICAL JOURNAL   影响因子和分区

0004-637X

1538-4357

The spatial distribution and polarization of Saturn narrowband (NB) emissions have been studied by using Cassini Radio and Plasma Wave Sciences data and goniopolarimetric data obtained through an inversion algorithm with a preset source located at the center of Saturn. From 2004 January 1 to 2017 September 12, NB emissions were selected automatically by a computer program and rechecked manually. The spatial distribution shows a preference for high latitude and intensity peaks in the region within 6 Saturn radii (R-s) for both 5 and 20 kHz NB emissions. 5 kHz NB emissions also show a local time preference roughly in the 18:00-22:00 sector. The Enceladus plasma torus makes it difficult for NB emissions to propagate to the low latitude regions outside the plasma torus. The extent of the low latitude regions where 5 and 20 kHz NB emissions were never observed is consistent with the corresponding plasma torus density contour in the meridional plane. 20 kHz NB emissions show a high circular polarization while 5 kHz NB emissions are less circularly polarized with vertical bar V vertical bar < 0.6 for majority of the cases. And cases of 5 kHz NB emissions with high circular polarization are more frequently observed at high latitude especially at the northern and southern edges of the Enceladus plasma torus.

SCI

英语

第一 ; 通讯

Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 41000000]

Astronomy & Astrophysics

Astronomy & Astrophysics

WOS:000695526600001

IOP PUBLISHING LTD

SPACE SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Guangdong, Peoples R China
2.Austrian Acad Sci Graz, Space Res Inst, Graz, Austria
3.Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan, Peoples R China
4.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
5.Univ Paris Meudon, Sorbonne Univ, CNRS, LESIA,Observ Paris,Univ PSL, Paris, France

Wu, Siyuan,Ye, Shengyi,Fischer, Georg,et al. Statistical Study on Spatial Distribution and Polarization of Saturn Narrowband Emissions[J]. ASTROPHYSICAL JOURNAL,2021,918(2).

Wu, Siyuan.,Ye, Shengyi.,Fischer, Georg.,Wang, Jian.,Long, Minyi.,...&Kurth, William S..(2021).Statistical Study on Spatial Distribution and Polarization of Saturn Narrowband Emissions.ASTROPHYSICAL JOURNAL,918(2).

Wu, Siyuan,et al."Statistical Study on Spatial Distribution and Polarization of Saturn Narrowband Emissions".ASTROPHYSICAL JOURNAL 918.2(2021).