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A Statistical Survey of Low‐Frequency Magnetic Fluctuations at Saturn
Author(s) -
Pan DongXiao,
Yao ZhongHua,
Guo RuiLong,
Bonfond Bertrand,
Wei Yong,
Dunn William,
Zhang BinZheng,
Zong QiuGang,
Zhou XuZhi,
Grodent Denis,
Wan WeiXing
Publication year - 2021
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2020ja028387
Subject(s) - magnetosphere of saturn , magnetosphere , physics , saturn , ionosphere , magnetopause , geophysics , wave power , noon , local time , atmospheric sciences , plasma sheet , atmosphere (unit) , astronomy , plasma , meteorology , planet , power (physics) , statistics , mathematics , quantum mechanics
Low‐frequency waves are closely related to magnetospheric energy dissipation processes. The Cassini spacecraft explored Saturn's magnetosphere for over 13 years, until September 2017, covering a period of more than a complete solar cycle. Using this rich heritage data set, we systematically investigated key physical parameters of low‐frequency waves in Saturn's magnetosphere, including their local time distribution and the dependence on solar activity. We found that the wave activity peaked in the near noon sector. For the nightside, the wave intensity also appeared to peak pre and postmidnight. Due to the limited local time coverage for each solar phase, we were not able to draw a firm conclusion on the wave's dependence on solar activity. In general, the wave power showed a monotonically decreasing trend toward larger distances in nightside sectors especially during the declining phase, which implied that low‐frequency waves mainly originate from the relatively inner regions of the magnetosphere. On the dayside, stronger waves were mostly located at/within ∼25 R s , near the magnetopause. The study shows a global picture of low‐frequency waves in Saturn's magnetosphere, providing important implications for how magnetospheric energy dissipates into Saturn's polar ionosphere and atmosphere.