Search Publications
On the Area Expansion of Magnetic Flux Tubes in Solar Active Regions
Cirtain, Jonathan W.; Dudík, Jaroslav; Dzifčáková, Elena
We calculated the three-dimensional (3D) distribution of the area expansion factors in a potential magnetic field, extrapolated from the high-resolution Hinode/SOT magnetogram of the quiescent active region NOAA 11482. Retaining only closed loops within the computational box, we show that the distribution of area expansion factors show significant…
CLUSTER-STAFF search coil magnetometer calibration - comparisons with FGM
de Conchy, Y.; Bouzid, V.; Piberne, R. +6 more
The main part of the Cluster Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment consists of triaxial search coils allowing the measurements of the three magnetic components of the waves from 0.1 Hz up to 4 kHz. Two sets of data are produced, one by a module to filter and transmit the corresponding waveform up to either 10 or 180 Hz …
MSR, a multi-spectrum retrieval technique for spatially-temporally correlated or common Venus surface and atmosphere parameters
Kappel, David
A common way to regularize mathematical ill-posed retrieval problems in atmospheric remote sensing is the incorporation of single-spectrum Bayesian a priori mean values and standard deviations for the parameters to be retrieved, along with measurement and simulation error information. This decreases the probability to obtain unlikely parameter val…
XMM-Newton and Swift observations of WZ Sagittae: spectral and timing analysis
Mukai, K.; Kuulkers, E.; Nucita, A. A. +3 more
Context. WZ Sagittae is the prototype object of a subclass of dwarf novae with rare and long (super)outbursts, in which a white dwarf primary accretes matter from a low mass companion. High-energy observations offer the possibility of a better understanding of the disk-accretion mechanism in WZ Sge-like binaries.
Aims: We used archival XMM-Ne…
A panchromatic survey of post-starburst mergers: searching for feedback
De Propris, Roberto; Melnick, Jorge
We consider the morphology, stellar populations, structure and AGN activity of 10 post-starburst (K+A) galaxies with Hubble Space Telescope (HST) observations, full spectral coverage in the optical, spectral energy distributions from 0.2 to 160 µm, X-ray and radio data. Our results show that the post-starburst galaxy (PSG) phenomenon is rela…
The global precipitation of magnetospheric electrons into Titan's upper atmosphere
Yelle, R. V.; Snowden, D.
We couple a two-stream electron transport model to a three-dimensional model of Titan's plasma interaction to calculate the global precipitation of magnetospheric electrons into Titan's atmosphere. We describe energy deposition rates from eleven simulations that vary the following parameters: relative orientation of the solar and magnetospheric ra…
Transient small-scale structure in the main auroral emission at Jupiter
Bonfond, B.; Palmaerts, B.; Grodent, D. +2 more
The main auroral emission at Jupiter results from the ionosphere-magnetosphere coupling current system associated with the corotation breakdown of iogenic plasma in the current sheet. The morphology and brightness of the main auroral emission are generally suggested to be stable during time intervals of the order of an hour. Here we reveal a trans…
On the X-Ray Variability of Magnetar 1RXS J170849.0-400910
Gehrels, N.; Kennea, J. A.; Beardmore, A. P. +4 more
We present a long-term X-ray flux and spectral analysis for 1RXS J170849.0-400910 using the Swift/X-Ray Telescope spanning over eight years from 2005 to 2013. We also analyze two observations from Chandra and XMM in the period from 2003 to 2004. In this ten-year period, 1RXS J170849.0-400910 displayed several rotational glitches. Previous studies …
A Star-forming Shock Front in Radio Galaxy 4C+41.17 Resolved with Laser-assisted Adaptive Optics Spectroscopy
Steinbring, Eric
Near-infrared integral-field spectroscopy of redshifted [O III], Hβ, and optical continuum emission from the z = 3.8 radio galaxy 4C+41.17 is presented, obtained with the laser-guide-star adaptive optics facility on the Gemini North telescope. Employing a specialized dithering technique, a spatial resolution of 0.''10, or 0.7 kpc, is achieved in e…
The HH34 outflow as seen in [Fe ii] 1.64 µm by LBT-LUCI
Lorenzetti, D.; Nisini, B.; Antoniucci, S. +4 more
Context. Dense atomic jets from young stars copiously emit in [Fe ii] IR lines, which can, therefore, be used to trace the immediate environments of embedded protostars.
Aims: We want to investigate the morphology of the bright [Fe ii] 1.64 µm line in the jet of the source HH34 IRS and compare it with the most commonly used optical trac…