Search Publications
Soft Gamma Repeaters: New Results and Surprises from Swift, INTEGRAL, and the Interplanetary Network
Hurley, K.
The history and observational properties of the soft gamma repeaters are reviewed. Over the past decades, we have gone from viewing these objects as a special class of cosmic gamma-ray burst, to seeing them as one manifestation of magnetars. There is now a solid body of multi-wavelength observations, as well as some more controversial properties. …
Non-thermal particle effects on the Hα and Hβ line profiles in the 18 August 2002 solar flare
Kashapova, L. K.; Kotrč, P.; Kupryakov, Yu. A.
We present results of the 18 August 2002 flare analysis as an example for developing a diagnostic tool for thermal and non-thermal processes in chromospheric lines. Taking into account the hard X-ray (HXR) emission, we attempted to derive the Hα and Hβ line properties which were caused by the non-thermal electron contribution and could be useful f…
A comparison of Neutral Atom Detector Unit neutral atom image inversion with a comprehensive ring current model
Barabash, S.; Liu, Z. X.; Tang, C. L. +4 more
We present energetic neutral atom (ENA) images in the energy range 45 to 50 keV for H and 92 to 138 keV for O measured by the Neutral Atom Detector Unit (NUADU) onboard Double Star TC-2 during a geomagnetic storm on 8 May 2005. We compare the ion fluxes deduced from inversion of the NUADU image with those calculated using the Comprehensive Ring Cu…
Momentum transfer at the high-latitude magnetopause and boundary layers
Farrugia, C. J.; Lund, E. J.; Sandholt, P. E.
Vertical Properties of the Global Haze on Titan Deduced from Methane Band Spectroscopy Between 7100 and 9200 Å
Sim, Chae-Kyung; Kim, Sang-Joon; Kim, Joo-Hyeon +3 more
Star Clusters in the Nearby Late-Type Galaxy NGC 1311
de Grijs, Richard; Windhorst, Rogier A.; Eskridge, Paul B. +3 more
Ultraviolet, optical and near-infrared images of the nearby (D ≈ 5.5 Mpc) SBm galaxy NGC 1311, obtained with the Hubble Space Telescope, reveal a small population of 13 candidate star clusters. We identify candidate star clusters based on a combination of their luminosity, extent, and spectral energy distribution. The masses of the cluster candida…
On the Doppler navigation of a small body orbiter: Rosetta
Mysen, E.; Aksnes, K.
In 2014 the ESA probe Rosetta is to rendezvous with short-period comet 67P/Churyumov-Gerasimenko, where it will be inserted into a stable bound orbit. Partly by measuring the Doppler displacements of the probe's radio carrier waves, the gravity field of the comet's nucleus will be found. In this work, navigation strategies are developed, and impor…
Ground-based astrometric observations of latitude for improved reference frame
Damljanović, Goran
The Commission 19 (Earth Rotation) of the International Astronomical Union - IAU established the Working Group on Earth Rotation in the Hipparcos Reference Frame - WG ERHRF at 1995 to collect the optical observations of latitude and universal time variations, made during 1899.7-1992.0 in line with Earth orientation programmes (to derive Earth Orie…
Results and perspectives of young stellar object long look programs
Sciortino, S.
Both Chandra and XMM-Newton have performed long look programs for studying the YSO physics. I will discuss recent results on the controversial issue of Class 0 YSO X-ray emission, the observational evidence of magnetic funnels interconnecting the YSO with its circumstellar disk and the Fe 6.4 keV fluorescent line emission and its origin. While rec…
Simulation of zonal flow excitation by drift mode turbulence: applications to tokamaks and the magnetopause
Davies, J. A.; Vaivads, A.; Dunlop, M. W. +5 more
Recently, we investigated the interaction between broadband drift mode turbulence and zonal flows near the edge of a region of magnetized plasma (Trines et al 2005 Phys. Rev. Lett. 94 165002). Our simulation results showed the development of a zonal flow through the modulational instability of the drift wave distribution, as well as the existence …