Search Publications
Bow shock and magnetopause contributions to the magnetospheric current system: Hints from the Cluster observations
Wang, C.; Tang, B. B.; Guo, X. C.
We perform a statistical study of the surface current at the high-latitude magnetopause (HLMP) and the bow shock under different southward interplanetary magnetic field (IMF) conditions, taking advantage of the crossing events of these discontinuities by the Cluster spacecraft. With an enhancement of southward IMF BZ, the surface curren…
Search for X-Ray Emission Associated with the Shapley Supercluster with Suzaku
Kelley, Richard L.; Sato, Kosuke; Ohashi, Takaya +6 more
Suzaku performed observations of 3 regions in and around the Shapley supercluster, a region located between A 3558 and A 3556, at
Discovery of a Compact Companion to the Hot Subdwarf Star BD +37° 442
Mereghetti, Sandro; Esposito, Paolo; Tiengo, Andrea +1 more
We report the results of the first X-ray observation of the luminous and helium-rich O-type subdwarf BD +37° 442 carried out with the XMM-Newton satellite in 2011 August. X-ray emission is detected with a flux of about 3× 10-14 erg cm-2 s-1 (0.2-1 keV) and a very soft spectrum, well fit by the sum of a blackbody wi…
Multi-wavelength Spectroscopic Observation of Extreme-ultraviolet Jet in AR 10960
Kitagawa, N.; Yokoyama, T.; Imada, S. +1 more
We have studied the relationship between the velocity and temperature of a solar EUV jet. The highly accelerated jet occurred in the active region NOAA 10960 on 2007 June 5. Multi-wavelength spectral observations with EIS/Hinode allow us to investigate Doppler velocities at a wide temperature range. We analyzed the three-dimensional angle of the j…
Rotation period of Venus estimated from Venus Express VIRTIS images and Magellan altimetry
Erard, S.; Drossart, P.; Piccioni, G. +2 more
The 1.02 µm wavelength thermal emission of the nightside of Venus is strongly anti-correlated to the elevation of the surface. The VIRTIS instrument on Venus Express has mapped this emission and therefore gives evidence for the orientation of Venus between 2006 and 2008. The Magellan mission provided a global altimetry data set recorded betw…
Post-equinox dynamics and polar cloud structure on Uranus
Sromovsky, L. A.; Fry, P. M.; Hammel, H. B. +2 more
Post equinox imaging of Uranus by HST, Keck, and Gemini telescopes has enabled new measurements of winds over previously sampled latitudes as well as measurements at high northern latitudes that have recently come into better view. These new observations also used techniques to greatly improve signal to noise ratios, making possible the detection …
The Relationship between Hard X-Ray Pulse Timings and the Locations of Footpoint Sources during Solar Flares
Dennis, B. R.; Inglis, A. R.
The cause of quasi-periodic pulsations in solar flares remains the subject of debate. Recently, Nakariakov & Zimovets proposed a new model suggesting that, in two-ribbon flares, such pulsations could be explained by propagating slow waves. These waves may travel obliquely to the magnetic field, reflect in the chromosphere, and constructively i…
The VLT/VISIR mid-IR view of 47 Tucanae. A further step in solving the puzzle of RGB mass loss
Bayo, A.; Milone, A. P.; Bressan, A. +5 more
There is an ongoing debate regarding the onset luminosity of dusty mass loss in population-II red giant stars. We present VLT/VISIR mid-infrared (MIR) 8.6 µm imaging of 47 Tuc, the centre of attention of a number of space-based Spitzer observations and studies. The VISIR high-resolution (diffraction limited) observations allow excellent matc…
The three-dimensional structure of Saturn's E ring
Hedman, M. M.; Burns, J. A.; Hamilton, D. P. +1 more
Saturn's diffuse E ring consists of many tiny (micron and sub-micron) grains of water ice distributed between the orbits of Mimas and Titan. Various gravitational and non-gravitational forces perturb these particles' orbits, causing the ring's local particle density to vary noticeably with distance from the planet, height above the ring-plane, hou…
A physical model for electron radiation belts of Saturn
Lorenzato, Lise; Sicard, AngéLica; Bourdarie, SéBastien
Radiation belts cause irreversible damages to on-board instrument materials. Studies about radiation belts can provide precious information for future interplanetary missions. Pioneer 11, Voyager 2 and nowadays Cassini missions give the characteristics of Saturn's inner magnetosphere: Saturn's famous rings, various moons, neutral particles ejected…