Search Publications
Bifurcations of the main auroral ring at Saturn: ionospheric signatures of consecutive reconnection events at the magnetopause
Milan, S. E.; Bonfond, B.; Gérard, J. -C. +4 more
This work reports for the first time on bifurcations of the main auroral ring at Saturn observed with the UVIS instrument onboard Cassini. The observation sequence starts with an intensification on the main oval, close to noon, which is possibly associated with dayside reconnection. Consecutive bifurcations appear with the onset of dayside reconne…
Cosmic rays and the magnetic field in the nearby starburst galaxy NGC 253 III. Helical magnetic fields in the nuclear outflow
Dettmar, R. -J.; Beck, R.; Krause, M. +1 more
Context. Magnetic fields are good tracers of gas compression by shock waves in the interstellar medium. These can be caused by the interaction of star-formation driven outflows from individual star formation sites as described in the chimney model. Integration along the line-of-sight and cosmic-ray diffusion may hamper detection of compressed magn…
Cassini SAR, radiometry, scatterometry and altimetry observations of Titan's dune fields
Lorenz, R. D.; Wye, L. C.; Janssen, M. A. +13 more
Large expanses of linear dunes cover Titan's equatorial regions. As the Cassini mission continues, more dune fields are becoming unveiled and examined by the microwave radar in all its modes of operation (SAR, radiometry, scatterometry, altimetry) and with an increasing variety of observational geometries. In this paper, we report on Cassini's rad…
Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars
Goupil, M. -J.; Baudin, F.; Hatzes, A. P. +12 more
Context. The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like oscillations are now observed in many stars, including red giants and main-sequence stars.
Aims: Based on several hundred identified pulsating red giants, we aim t…
Thermal Structure and Dynamics of Saturn’s Northern Springtime Disturbance
Nicholson, Philip D.; Fletcher, Leigh N.; Sotin, Christophe +16 more
Saturn’s slow seasonal evolution was disrupted in 2010-2011 by the eruption of a bright storm in its northern spring hemisphere. Thermal infrared spectroscopy showed that within a month, the resulting planetary-scale disturbance had generated intense perturbations of atmospheric temperatures, winds, and composition between 20° and 50°N over an ent…
Properties of Near-Earth Magnetic Reconnection from In-Situ Observations
Fuselier, S. A.; Lewis, W. S.
Many properties of magnetic reconnection have been determined from in-situ spacecraft observations in the Earth's magnetosphere. Recent studies have focused on ion scale lengths and have largely confirmed theoretical predictions. In addition, some interesting features of reconnection regions on electron scale lengths have been identified. These re…
The optically bright post-AGB population of the LMC
Wood, P. R.; van Winckel, H.; Lloyd Evans, T. +3 more
Context. The detected variety in chemistry and circumstellar shell morphology of the limited sample of Galactic post-asymptotic giant branch (AGB) stars is so large that there is no consensus yet on how the different objects are linked by evolutionary channels. The evaluation is complicated by the fact that their distances and hence luminosities r…
X-ray illumination of the ejecta of supernova 1987A
Panagia, N.; Larsson, J.; Sollerman, J. +25 more
When a massive star explodes as a supernova, substantial amounts of radioactive elements--primarily 56Ni, 57Ni and 44Ti--are produced. After the initial flash of light from shock heating, the fading light emitted by the supernova is due to the decay of these elements. However, after decades, the energy powering a s…
Numerical Simulations of the Magnetic Rayleigh-Taylor Instability in the Kippenhahn-Schlüter Prominence Model
Shibata, Kazunari; Isobe, Hiroaki; Hillier, Andrew +1 more
The launch of the Hinode satellite has allowed unprecedented high-resolution, stable images of solar quiescent prominences to be taken over extended periods of time. These new images led to the discovery of dark upflows that propagated from the base of prominences, developing highly turbulent profiles. As yet, how these flows are driven is not ful…
Total particulate mass in Enceladus plumes and mass of Saturn’s E ring inferred from Cassini ISS images
Ingersoll, Andrew P.; Ewald, Shawn P.
The eclipse mosaic (PIA08329) of the Saturn system, taken on September 15, 2006 when Cassini was in Saturn’s shadow, contains numerous color images of the Enceladus plume and the E ring at phase angles ranging from 173° to 179°. These forward-scattering observations sample the diffraction peak for particle radii in the 1-5 µm range. The phas…