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Recent Developments in Local Helioseismology
Thompson, M. J.; Zharkov, S.
Local helioseismology is providing new views of subphotospheric flows from supergranulation to global-scale meridional circulation and for studying structures and dynamics in the quiet Sun and active regions. In this short review we focus on recent developments, and in particular on a number of current issues, including the sensitivity of differen…
Spatially Resolved Spectroscopy of Coma Cluster Early-Type Galaxies. IV. Completing the Data Set
Saglia, R. P.; Thomas, D.; Thomas, J. +3 more
The long-slit spectra obtained along the minor axis, offset major axis, and diagonal axis are presented for 12 E and S0 galaxies of the Coma Cluster drawn from a magnitude-limited sample studied before. The rotation curves, velocity dispersion profiles, and the H3 and H4 coefficients of the Hermite decomposition of the line-o…
MHD simulations of the global solar corona around the Halloween event in 2003 using the synchronic frame format of the solar photospheric magnetic field
Liu, Yang; Hayashi, Keiji; Zhao, Xue Pu
We performed two time-relaxation magnetohydrodynamics (MHD) simulations of the solar corona: one uses the boundary map representing the solar surface magnetic field distribution before the Halloween event in 2003, and the other uses map representing the postevent distribution. The aims of this study are to test a new concept of a solar surface mag…
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…