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Magnetic Connectivity Between Active Regions 10987, 10988, and 10989 by Means of Nonlinear Force-Free Field Extrapolation
Inhester, B.; Wiegelmann, T.; Tadesse, Tilaye +1 more
Extrapolation codes for modelling the magnetic field in the corona in Cartesian geometry do not take the curvature of the Sun's surface into account and can only be applied to relatively small areas, e.g., a single active region. We apply a method for nonlinear force-free coronal magnetic field modelling of photospheric vector magnetograms in sphe…
Cloud structure of Saturn's 2010 storm from ground-based visual imaging
Sánchez-Lavega, A.; Pérez-Hoyos, S.; Colas, F. +5 more
We present a study of the vertical cloud structure for the initial stage of the Great White Spot (GWS), a giant storm that developed in Saturn in December 2010, using ground-based visual images. We focus in the characterization of the undisturbed atmosphere preceding the storm and the disturbed region in the wake of the GWS. The observations were …
Properties of OH, SIO, and H2O Maser Emission in O-Rich AGB Stars
Suh, Kyung-Won; Kwon, Young-Joo
A new shape from shading technique with application to Mars Express HRSC images
Barnes, D.; O'Hara, R.
We have developed a new optimisation based shape from shading algorithm which is able to make use of sophisticated camera and reflectance models and does not require a good initialising surface. Surface shape consistent with ground truth is obtained when the technique is applied to both synthetic rendered surfaces and real images captured by the M…
Transiting exoplanets from the CoRoT space mission. XXII. CoRoT-16b: a hot Jupiter with a hint of eccentricity around a faint solar-like star
Mazeh, T.; Guterman, P.; Aigrain, S. +53 more
Aims: We report the discovery of CoRoT-16b, a low density hot jupiter that orbits a faint G5V star (mV = 15.63) in 5.3523 ± 0.0002 days with slight eccentricity. A fit of the data with no a priori assumptions on the orbit leads to an eccentricity of 0.33 ± 0.1. We discuss this value and also derive the mass and radius of the planet.
Meth…
New insights into SNR evolution revealed by the discovery of recombining plasmas
Yamaguchi, Hiroya; Ozawa, Midori; Ohnishi, Takao
We report the discovery of recombining plasmas in three supernova remnants (SNRs) with the Suzaku X-ray astronomy satellite. During SNR's evolution, the expanding supernova ejecta and the ambient matter are compressed and heated by the reverse and forward shocks to form an X-ray emitting hot plasma. Since ionization proceeds slowly compared to sho…
A teardrop-shaped ionosphere at Venus in tenuous solar wind
Coates, A. J.; Barabash, S.; Lundin, R. +9 more
A very tenuous solar wind regime, following a series of large coronal mass ejections, impacted Venus during early August, 2010. STEREO-B downstream from Venus observed that the solar wind density at Earth orbit dropped to ∼0.1 #/cm3 and persisted at this value over 1 day. A similar low value was observed at Earth in 1999 and has attract…
A Period Distribution of X-Ray Binaries Observed in the Central Region of M31 with Chandra and the Hubble Space Telescope
Zezas, A.; Murray, S. S.; Garcia, M. R. +4 more
Almost all Galactic black hole (BH) binaries with low-mass donor stars are transient X-ray sources; we expect most of the X-ray transients observed in external galaxies to be BH binaries also. Obtaining period estimates for extragalactic transients is challenging, but the resulting period distribution is an important tool for modeling the evolutio…
Observational Constraints on the Molecular Gas Content in Nearby Starburst Dwarf Galaxies
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +5 more
Using star formation histories derived from optically resolved stellar populations in 19 nearby starburst dwarf galaxies observed with the Hubble Space Telescope, we measure the stellar mass surface densities of stars newly formed in the bursts. By assuming a star formation efficiency (SFE), we then calculate the inferred gas surface densities pre…
Electron dynamics in the reconnection ion diffusion region
Fazakerley, A. N.; Daly, P. W.; Nakamura, R. +4 more
We investigate and compare Cluster observations of electron dynamics in different locations of the ion diffusion region for magnetic reconnection in the Earth's magnetotail. On the basis of the 2-D reconstructed magnetic field map from Cluster 1 (C1), we pinpoint that the observed Hall field is ∼6000 km (∼9 ion inertial lengths) away from the magn…