Statistics of Water-group Band Ion Cyclotron Waves in Saturn's Inner Magnetosphere Based on 13 yr of Cassini Measurements

Long, Minyi1; Cao, Xing1; Gu, Xudong1; Ni, Binbin1,2; Qu, Shaojie3; Ye, Shengyi4; Yao, Zhonghua5; Wu, Siyuan4; Xu, Yan5

2022-06-01

10.3847/1538-4357/ac6bf0

ASTROPHYSICAL JOURNAL   Impact Factor & Quartile

0004-637X

1538-4357

Based on Cassini observations from 2004 to 2016, we perform a comprehensive analysis of the statistical distribution of the occurrence rate, averaged amplitude, wave normal angle (WNA), ellipticity, and power spectral intensity of ion cyclotron waves in Saturn's inner magnetosphere. Our results show that ion cyclotron waves mainly occur between the orbits of Enceladus and Dione near the equatorial region (vertical bar lambda vertical bar < 20 degrees), with higher occurrence rates in the northern hemisphere than the southern hemisphere. The averaged wave amplitudes vary between 0.1 and 2 nT with a strong day-night asymmetry and a pronounced minimum at the equator. Saturnian ion cyclotron waves are predominantly left-handed polarized with small WNAs near the equator and become linearly polarized with larger WNAs at higher latitudes. The major wave power occurs frequently at frequencies of 0.5-1.2 f(w)+, where f(w)+ is the equatorial gyrofrequency of H2O+ ions, with the strongest intensity (>similar to 10 nT(2) Hz(-1)) at L similar to 6.5 statistically present in the midnight sector.

SCI

English

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pre-research projects on Civil Aerospace Technologies - China National Space Administration["D020303","D020104","D020308"] ; NSFC[42025404,42188101,41904144] ; B-type Strategic Priority Program of the Chinese Academy of Sciences[XDB41000000] ; Fundamental Research Funds for the Central Universities["2042021kf1045","2042021kf1056","2042022kf1012"]

Astronomy & Astrophysics

Astronomy & Astrophysics

WOS:000811485700001

IOP Publishing Ltd

SPACE SCIENCE

Web of Science

1.Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China
3.Inst Spacecraft Syst Engn, Beijing, Peoples R China
4.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China

Long, Minyi,Cao, Xing,Gu, Xudong,et al. Statistics of Water-group Band Ion Cyclotron Waves in Saturn's Inner Magnetosphere Based on 13 yr of Cassini Measurements[J]. ASTROPHYSICAL JOURNAL,2022,932(1).

Long, Minyi.,Cao, Xing.,Gu, Xudong.,Ni, Binbin.,Qu, Shaojie.,...&Xu, Yan.(2022).Statistics of Water-group Band Ion Cyclotron Waves in Saturn's Inner Magnetosphere Based on 13 yr of Cassini Measurements.ASTROPHYSICAL JOURNAL,932(1).

Long, Minyi,et al."Statistics of Water-group Band Ion Cyclotron Waves in Saturn's Inner Magnetosphere Based on 13 yr of Cassini Measurements".ASTROPHYSICAL JOURNAL 932.1(2022).