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A Time-Evolving 3D Method Dedicated to the Reconstruction of Solar Plumes and Results Using Extreme Ultraviolet Data
Auchère, Frédéric; Vial, Jean-Claude; Barbey, Nicolas +1 more
An important issue in the tomographic reconstruction of the solar poles is the relatively rapid evolution of the polar plumes. We demonstrate that it is possible to take into account this temporal evolution in the reconstruction. The difficulty of this problem comes from the fact that we want a four-dimensional reconstruction (three spatial dimens…
Physical Properties of Wave Motion in Inclined Magnetic Fields within Sunspot Penumbrae
Braun, D. C.; Cally, P. S.; Lindsey, C. +1 more
At the surface of the Sun, acoustic waves appear to be affected by the presence of strong magnetic fields in active regions. We explore the possibility that the inclined magnetic field in sunspot penumbrae may convert primarily vertically-propagating acoustic waves into elliptical motion. We use helioseismic holography to measure the modulus and p…
FUSE spectroscopy of the sdOB primary of the post common-envelope binary LB 3459 (AA Doradus )
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Context:
Whistler mode waves from lightning on Venus: Magnetic control of ionospheric access
Russell, C. T.; Wei, H. Y.; Zhang, T. L.
The fluxgate magnetometer on Venus Express samples the magnetic field near periapsis at 128 Hz. Bursts of plane-polarized magnetic waves in the vicinity of 100 Hz are observed propagating at small angles to the magnetic field. The magnetic field is generally horizontal in the region around periapsis, located at high northern latitudes. When the ma…
Resolving stellar populations outside the Local Group: MAD observations of UKS 2323-326
Gullieuszik, M.; Moretti, A.; Falomo, R. +14 more
Aims: We present a study aimed at deriving constraints on star formation at intermediate ages from the evolved stellar populations in the dwarf irregular galaxy UKS 2323-326. These observations were also intended to demonstrate the scientific capabilities of the multi-conjugated adaptive optics demonstrator (MAD) implemented at the ESO Very Large …
XMM-Newton Observations of Broad Absorption Line Quasars with Polar Outflows
Zhou, Hongyan; Wang, Huiyuan; Jiang, Peng +3 more
We have selected a sample of broad absorption line (BAL) quasars which show significant radio variations, indicating the presence of polar BAL outflows. We obtained snapshot XMM observations of four polar BAL QSOs, to check whether strong X-ray absorption, one of the most prominent characteristics of most BAL QSOs, also exists in polar outflows. T…
Huygens probe entry trajectory and attitude estimated simultaneously with Titan atmospheric structure by Kalman filtering
Colombatti, Giacomo; Aboudan, Alessio; Ferri, Francesca +1 more
Space probes entering planetary atmospheres are used for in situ study of their physical structures. During the entry phase aerodynamic forces exerted on the probe depend on atmospheric density. As a consequence accelerations measured by on-board sensors can be used to derive probe trajectory as well as atmospheric density, pressure and temperatur…
Abundances of planetary nebulae NGC 3242 and NGC 6369
Pottasch, S. R.; Bernard-Salas, J.
The spectra of the planetary nebulae
Multiwavelength study of a young open cluster NGC7419
Pandey, J. C.; Singh, K. P.; Sharma, Saurabh +3 more
Using new UBVRIHα CCD photometric observations and the archival infrared and X-ray data, we have carried out a multiwavelength study of a Perseus arm young open star cluster NGC7419. An age of 22.5 +/- 3.0Myr and a distance of 3230+330-430pc are derived for the cluster. Our photometric data indicate a higher value of colour e…
A physical interpretation of the jet-like X-ray emission from supernova remnant W49B
Ballet, J.; Miceli, M.; Bocchino, F. +4 more
In the framework of the study of supernova remnants and their complex interaction with the interstellar medium and the circumstellar material, we focus on the galactic supernova remnant W49B. Its morphology exhibits an X-ray bright elongated nebula, terminated on its eastern end by a sharp perpendicular structure aligned with the radio shell. The …