Article
Engineering, Aerospace
Skralan Hosteaux, Luciano Rodiguez, Stefaan Poedts
Summary: This paper studies the ICMEs detected by Voyager spacecraft between 1977 and 1980 during their propagation from 1 to 10 AU. The study explores the internal structure of 21 common events detected by both spacecraft and analyzes their plasma and magnetic field properties. The results show that ICMEs expand as they propagate, with decreasing density and magnetic field intensities, consistent with previous studies. The methods described in this paper can be useful for studying other heliospheric missions and emphasize the importance of utilizing valuable data from past missions.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Y. Xu, R. L. Guo, Z. H. Yao, D. X. Pan, W. R. Dunn, S-Y Ye, B. Zhang, Y. X. Sun, Y. Wei, A. J. Coates
Summary: Plasmoids play a key role in transferring magnetic flux and plasma in planetary magnetospheres. Studies have shown that plasmoids exist in Saturn's dayside magnetodisc, with the electron density showing an inverse correlation with local time on the nightside and reaching its maximum around prenoon on the dayside. These findings are consistent with the magnetospheric circulation picture associated with the Vasyliunas cycle.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
C. Paranicas, E. Roussos, K. Dialynas, P. Kollmann, N. Krupp, M. Hedman, R. C. Allen, G. Hospodarsky
Summary: Cassini data confirm the presence of a global electric field in Saturn's magnetosphere that influences charged particle drift paths near the outer edge of the A ring. The measurements of ultrarelativistic electrons provide no information about the electric field. This result strengthens the case for using the presence of the electric field to explain acceleration signatures in the data.
ASTROPHYSICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
J. Kinrade, A. Bader, S. Badman, C. Paranicas, D. G. Mitchell, D. Constable, C. S. Arridge, S. W. H. Cowley, G. Provan
Summary: The study analyzed the morphology of oxygen and hydrogen ENAs in Saturn's magnetosphere using data from Cassini's Ion Neutral Camera, revealing differences in intensity between day and night sides, influenced by plasma injections and electric fields. Global intensity is clearly modulated with Saturn's near-planetary rotation period.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
A. C. Cummings, E. C. Stone, J. D. Richardson, B. C. Heikkila, N. Lal, J. Kota
Summary: Anisotropy results for anomalous cosmic-ray protons were derived for the first time from CRS data during roll maneuvers for the magnetometer instrument onboard Voyager 2 in the inner heliosheath. The radial solar wind speeds derived from the anisotropy vectors show discrepancies with those directly measured by the PLS instrument. Observations suggest that the C-G method underestimates true speeds as Voyager 2 approaches the heliopause.
ASTROPHYSICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
L. Rusaitis, K. K. Khurana, M. G. Kivelson, R. J. Walker
Summary: This study models the quasiperiodic 60 min waves in Saturn's outer magnetosphere as field line resonances, predicting frequencies and amplitudes of different modes. The results indicate that magnetic field perturbations are more prominent at high latitudes, in agreement with more frequent occurrences at mid-to-high latitudes.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
C-J Yuan, E. Roussos, Y. Wei, N. Krupp, Y. X. Sun, Y. X. Hao
Summary: Using measurements from the Cassini spacecraft over 13 years, the study shows that the morphology of electron pitch angle distributions varies at different L-shells in Saturn's magnetosphere. Convective transport continues to govern at L = 3.5, while resonant interactions with waves may also play a key role in regulating dynamics in the core region of the radiation belts at smaller L-shells.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Aerospace
Ezequiel Echer, Adriane Marques de Souza Franco, Fabiola Pinho Magalhaes, Mauricio J. A. Bolzan, Rajkumar Hajra
Summary: The aim of this study is to investigate the turbulence in Neptune's dayside magnetosheath. Analysis of Voyager-2 magnetometer data revealed that most of the magnetosheath magnetic field is aligned in the BT direction. The Fourier spectrum of the magnetic field showed a breakpoint near 0.00165 Hz, with the lower frequency portion having index values smaller than 1.0 and the higher frequency portion having a steeper power law.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
C. G. A. Smith
Summary: A three-dimensional linear model was developed to explain Saturn's planetary period oscillations, focusing on the interaction of Rossby waves and current systems. The model successfully describes observed current systems when opposite hemispheres have distinct PPO periods. However, the model falls short in explaining why the PPO current systems become 'locked' together with a specific phase relationship.
Article
Geosciences, Multidisciplinary
S. B. Xu, S. Y. Huang, Z. G. Yuan, X. H. Deng, K. Jiang, Y. Y. Wei, J. Zhang, Z. H. Zhang, Q. Y. Xiong, L. Yu, R. T. Lin, J. H. Waite
Summary: Through analyzing data from the Cassini spacecraft, researchers have identified and characterized dipolarization fronts (DF) in Saturn's magnetosphere. They found that DFs are not only present in the nightside magnetotail, but also in the dayside magnetosphere, with an asymmetric distribution between the northern and southern hemispheres. The presence of DFs on the dayside suggests that magnetic reconnection may occur in this region as well.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
D. J. Southwood, H. Cao, O. Shebanits, T. Elsden, G. J. Hunt, M. K. Dougherty
Summary: The research indicates that the oscillations detected in the magnetic field during periapsis passes of the Cassini Saturn Orbiter spacecraft are likely associated with Alfven waves, which are primarily time-varying in the plasma frame. Additionally, nearly all signals exhibit a magnetic node feature near the equator of the effective field line.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Geosciences, Multidisciplinary
Ze-Fan Yin, Yi-Xin Sun, Xu-Zhi Zhou, Dong-Xiao Pan, Zhong-Hua Yao, Chao Yue, Ze-Jun Hu, Elias Roussos, Michel Blanc, Hai-Rong Lai, Qiu-Gang Zong
Summary: The study reveals the diverse observational features of particles in flux tubes with enhanced equatorial magnetic fields in Saturn's magnetosphere. These features are attributed to the sharp magnetic gradient at the edge of the flux tubes, which alters the drift trajectories of particles and leads to the diverse observational results.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
G. J. Hunt, G. Provan, T. J. Bradley, S. W. H. Cowley, M. K. Dougherty, E. Roussos
Summary: The study examines the response of the dawn region auroral field-aligned currents and the azimuthal ring currents to compressions and expansions of the Saturnian magnetosphere. It concludes that during tail reconnection events, the currents within the downward current sheet increase in strength, and there is an increase in energetic particle intensities in the downward current region.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2022)
Article
Astronomy & Astrophysics
B. R. Neupane, Peter A. Delamere, X. Ma, C-S Ng, B. Burkholder, Peter Damiano
Summary: Saturn's magnetosphere can be categorized into quiet and disturbed periods based on magnetic field fluctuations, with disturbed events occurring mainly at latitudes between -5 degrees and +30 degrees and mostly on the dayside. Kinetic turbulent heating due to magnetic field fluctuation could potentially provide a significant amount of the required power.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Bader, J. Kinrade, S. Badman, C. Paranicas, D. A. Constable, D. G. Mitchell
Summary: Observations of energetic neutral atoms (ENAs) provide valuable information about ion and neutral abundances in planetary magnetospheres. By re-projecting all observations into a common reference frame, it becomes easier to investigate the morphology and dynamics of Saturn's ring current.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Editorial Material
Physics, Fluids & Plasmas
M. Kikuchi, C. Z. Cheng
Article
Physics, Fluids & Plasmas
H. Tanabe, T. Yamada, T. Watanabe, K. Gi, M. Inomoto, R. Imazawa, M. Gryaznevich, R. Scannell, N. J. Conway, C. Michael, B. Crowley, I. Fitzgerald, A. Meakins, N. Hawkes, K. G. McClements, J. Harrison, T. O'Gorman, C. Z. Cheng, Y. Ono
Article
Physics, Fluids & Plasmas
H. Tanabe, T. Yamada, T. Watanabe, K. Gi, M. Inomoto, R. Imazawa, M. Gryaznevich, C. Michael, B. Crowley, N. J. Conway, R. Scannell, J. Harrison, I. Fitzgerald, A. Meakins, N. Hawkes, K. G. McClements, T. O'Gorman, C. Z. Cheng, Y. Ono
PHYSICS OF PLASMAS
(2017)
Article
Physics, Fluids & Plasmas
X. Guo, R. Horiuchi, C. Z. Cheng, Y. Kaminou, Y. Ono
PHYSICS OF PLASMAS
(2017)
Editorial Material
Physics, Fluids & Plasmas
Mark Koepke, C. Z. Cheng, Robert Bingham
PLASMA PHYSICS AND CONTROLLED FUSION
(2017)
Article
Physics, Fluids & Plasmas
Yasushi Nishida, Tzu-Ching Chen, Chio-Zong Cheng
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2018)
Article
Physics, Fluids & Plasmas
S. Kamio, M. Inomoto, K. Yamasaki, T. Yamada, C. Z. Cheng, Y. Ono
PHYSICS OF PLASMAS
(2018)
Article
Geosciences, Multidisciplinary
Tzu-Fang Chang, Chio-Zong Cheng, Sunny Wing-Yee Tam, Chih-Yu Chiang, Yoshizumi Miyoshi, Tomoaki Hori, Takefumi Mitani, Takeshi Takashima, Ayako Matsuoka, Mariko Teramoto, Iku Shinohara
EARTH PLANETS AND SPACE
(2019)
Article
Physics, Fluids & Plasmas
Y. Ono, S. Inoue, H. Tanabe, C. Z. Cheng, H. Hara, R. Horiuchi
Article
Physics, Fluids & Plasmas
C. Z. Cheng, G. J. Kramer, M. Podesta, R. Nazikian
PHYSICS OF PLASMAS
(2019)
Article
Physics, Fluids & Plasmas
G. Kramer, C. Cheng, M. Podesta, R. Nazikian
PLASMA PHYSICS AND CONTROLLED FUSION
(2020)
Article
Physics, Fluids & Plasmas
H. Tanabe, H. Tanaka, Q. Cao, Y. Cai, M. Akimitsu, T. Ahmadi, C. Z. Cheng, M. Inomoto, Y. Ono
Summary: Experimental results reveal that during magnetic reconnection, ion heating and transport exhibit global characteristics, forming characteristic ring-like structures aligned with field lines, which are sensitive to factors such as the polarity of the toroidal field and the global structure's tilt. This study also demonstrates for the first time the existence of poloidally asymmetric non-classical features through parallel acceleration and global heat transport processes.
Article
Physics, Fluids & Plasmas
C. Z. Cheng, S. Inoue, Y. Ono, H. Tanabe, R. Horiuchi, S. Usami
Summary: A theoretical model and analytic theory were developed to study anti-parallel driven magnetic reconnection in collisionless plasmas. Results show good agreement with experimental and observational data, providing insight into the current sheet structure in such systems.
PHYSICS OF PLASMAS
(2021)
Editorial Material
Physics, Fluids & Plasmas
C. Z. Cheng, G. J. Kramer, M. Podesta, R. Nazikian
PHYSICS OF PLASMAS
(2021)
Article
Physics, Fluids & Plasmas
Y. A. Chen, Y. Nishimura, Y. Nishida, C. Z. Cheng