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Related papers: Exploring overstabilities in Saturn's A ring using…

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We observe Saturn and its ring system at wavelengths of 1.3 mm (220 GHz) using the Combined Array for Research in Millimeter-wave Astronomy (CARMA) interferometric array. We study the intensity and polarisation structure of the planet and…

Earth and Planetary Astrophysics · Physics 2015-11-13 Moumita Aich , Kenda Knowles , Kavilan Moodley , Jonathan Sievers , Matthew M. Hedman

We report the first unambiguous detection of X-ray emission originating from Saturn with a Chandra observation, duration 65.5 ksec with ACIS-S3. Beyond the pure detection we analyze the spatial distribution of X-rays on the planetary…

Astrophysics · Physics 2009-11-10 J. -U. Ness , J. H. M. M. Schmitt , S. J. Wolk , K. Dennerl , V. Burwitz

We use a state-of-the-art physics-based model of electromagnetic scattering to analyze average circular polarization ratios measured for the A and B rings of Saturn at a wavelength of 12.6 cm. This model is directly based on the Maxwell…

Astrophysics · Physics 2011-02-11 Michael I. Mishchenko , Janna M. Dlugach

We present an extensive data set of ~150 localized features from Cassini images of Saturn's Ring A, a third of which are demonstrated to be persistent by their appearance in multiple images, and half of which are resolved well enough to…

Astrophysics · Physics 2008-02-14 Matthew S. Tiscareno , Joseph A. Burns , Matthew M. Hedman , Carolyn C. Porco

Using the Advanced CCD Imaging Spectrometer (ACIS), the Chandra X-ray Observatory (CXO) observed the Saturnian system for one rotation of the planet (~37 ks) on 20 January, 2004, and again on 26-27 January, 2004. In this letter we report…

This paper addresses resonantly forced spiral density waves in a dense planetary ring which is close to the threshold for viscous overstability. We solve numerically the hydrodynamical equations for a dense, axisymmetric thin disk in the…

Earth and Planetary Astrophysics · Physics 2019-03-20 Marius Lehmann , Juergen Schmidt , Heikki Salo

We present a study of the behavior of Saturn's A ring outer edge, using images and occultation data obtained by the Cassini spacecraft over a period of 8 years from 2006 to 2014. More than 5000 images and 170 occultations of the A ring…

Saturn's rings act as a system of innumerable test particles that are remarkably sensitive to periodic disturbances in the planet's gravitational field. We identify 15 additional density and bending waves in Saturn's C ring driven by the…

Earth and Planetary Astrophysics · Physics 2021-09-15 R. G. French , B. Bridges , M. M. Hedman , P. D. Nicholson , C. Mankovich , C. A. McGhee-French

The accurate determination of Saturn's gravitational coefficients by Cassini could provide tighter constrains on Saturn's internal structure. Also, occultation measurements provide important information on the planetary shape which is often…

Earth and Planetary Astrophysics · Physics 2015-06-15 Ravit Helled , Tristan Guillot

A new model for the shape of the prominent eccentric ringlet in the gap exterior to Saturn's B-ring is developed based on Cassini imaging observations taken over about 8 years. Unlike previous treatments, the new model treats each edge of…

Earth and Planetary Astrophysics · Physics 2016-08-31 Joseph N. Spitale , Joseph M. Hahn

We have developed a semi-analytic method of parameterizing N-body simulations of self-gravity wakes in Saturn's rings, describing their properties by means of only 6 numbers: 3 optical depths and 3 weighting factors. These numbers are…

The Cassini Division in Saturn's rings contains a series of eight named gaps, three of which contain dense ringlets. Observations of stellar occultations by the Visual and Infrared Mapping Spectrometer onboard the Cassini spacecraft have…

Earth and Planetary Astrophysics · Physics 2010-01-07 M. M. Hedman , P. D. Nicholson , K. H. Baines , B. J. Buratti , C. Sotin , R. N. Clark , R. H. Brown , R. G. French , E. A. Marouf

Aims. To investigate the mid-infrared (MIR) characteristics of Saturn's rings. Methods. We collected and analyzed MIR high spatial resolution images of Saturn's rings obtained in January 2008 and April 2005 with COMICS mounted on Subaru…

Earth and Planetary Astrophysics · Physics 2017-03-01 Hideaki Fujiwara , Ryuji Morishima , Takuya Fujiyoshi , Takuya Yamashita

A new method based on continuous wavelet transform with the complex Morlet wavelet to analyze Saturn main rings is presented. It allows to investigate in detail the resonance zones and reveal the coexistence of waves with stable periods and…

Astrophysics · Physics 2007-05-23 E. B. Postnikov , A. Loskutov

We present an analysis of data about Saturn's atmosphere from Cassini's Visual and Infrared Mapping Spectrometer (VIMS), focusing on the meteorology of the features seen in the 5-micron spectral window. We present VIMS mosaics and discuss…

Earth and Planetary Astrophysics · Physics 2013-01-28 David S. Choi , Adam P. Showman , Robert H. Brown

We used 0.85 - 5.1 micron 2006 observations by Cassini's Visual and Infrared Mapping Spectrometer (VIMS) to constrain the unusual vertical structure and compositions of cloud layers in Saturn's south polar region, the site of a powerful…

Earth and Planetary Astrophysics · Physics 2019-08-23 Lawrence A. Sromovsky , Kevin H. Baines , Patrick M. Fry

We describe a model that accounts for the complex morphology of spiral density waves raised in Saturn's rings by the co-orbital satellites, Janus and Epimetheus. Our model may be corroborated by future Cassini observations of these…

Over the past few decades, various conjectures were advanced that Saturn's rings are Cantor-like sets, although no convincing fractal analysis of actual images has ever appeared. We focus on the images sent by the Cassini spacecraft…

Earth and Planetary Astrophysics · Physics 2012-07-03 Jun Li , Martin Ostoja-Starzewski

A multi-decade record of ground-based mid-infrared (7-25 $\mu$m) images of Saturn is used to explore seasonal and non-seasonal variability in thermal emission over more than a Saturnian year (1984-2022). Thermal emission measured by 3-m and…

JWST measured the infrared spectra of Saturn's rings and several of its small moons (Epimetheus, Pandora, Telesto and Pallene) as part of Guaranteed Time Observation program 1247. The NIRSpec instrument obtained near-infrared spectra of the…