Search Publications
Validation of CME Detection Software (CACTus) by Means of Simulated Data, and Analysis of Projection Effects on CME Velocity Measurements
Berghmans, D.; Poedts, S.; Robbrecht, E. +3 more
In the context of space weather forecasting, an automated detection of coronal mass ejections (CMEs) becomes more and more important for efficiently handling a large data flow which is expected from recently-launched and future solar missions. In this paper we validate the detection software package "CACTus" by applying the program to synthetic da…
Effects of High-Energy Ionizing Particles on the Si:As Mid-Infrared Detector Array on Board the AKARI Satellite
Oyabu, S.; Wada, T.; Mori, T. +6 more
We evaluate the effects of high-energy ionizing particles on the Si:As impurity band conduction (IBC) mid-infrared detector on board AKARI, the Japanese infrared astronomical satellite. IBC-type detectors are known to be little influenced by ionizing radiation. However, we find that the detector is significantly affected by in-orbit ionizing radia…
The populations of hard X-ray and γ-ray sources: a correlation study and new possible identifications
Cusumano, G.; Tramacere, A.; La Parola, V. +4 more
Aims: We present the results of our analysis devoted to researching Galactic and extragalactic sources emitting in the energy bands surveyed by both the Swift-BAT and the Fermi-LAT telescopes.
Methods: We cross-correlated the Fermi-LAT 1-year point source catalogue (1FGL) of gamma-ray sources and the second Palermo BAT catalogue (2PBC) o…
Suzaku Observation of a New Merging Group of Galaxies at a Filamentary Junction
Yoshitake, Hiroshi; Kawahara, Hajime; Nishimichi, Takahiro +1 more
We report on a new merging group of galaxies, Suzaku J1552+2739, at z ~ 0.08 revealed by a Suzaku observation. The group was found by observing a junction of galaxy filaments optically identified in the Sloan Digital Sky Survey spectroscopic data. Suzaku J1552+2739 exhibits an irregular morphology and presents several peaks in its X-ray image. A b…
VLT adaptive optics search for luminous substructures in the lens galaxy towards SDSS J0924+0219
Faure, C.; Meylan, G.; Courbin, F. +4 more
The anomalous flux ratios between quasar images are suspected of being caused by substructures in lens galaxies. We present new deep and high-resolution H and Ks imaging of the strongly lensed quasar SDSS J0924+0219 obtained using the ESO VLT with adaptive optics and the laser guide star system. SDSS J0924+0219 is particularly interesting because …
Energy Release During Slow Long-Duration Flares Observed by RHESSI
Kołomański, S.; Mrozek, T.; Bąk-Stęślicka, U.
Slow long-duration events (SLDEs) are flares characterized by the long duration of their rising phase. In many such cases the impulsive phase is weak without typical short-lasting pulses. Instead, smooth, long-lasting hard X-ray (HXR) emission is observed. We analyzed hard X-ray emission and morphology of six selected SLDEs. In our analysis we uti…
Light curve analysis of Hipparcos data for the massive O-type eclipsing binary UW CMa
Parthasarathy, M.; Antokhina, E. A.; Srinivasa Rao, M.
Hipparcos photometric data for the massive O-type binary UW CMa were analysed within the framework of the Roche model. Photometric solutions were obtained for five mass ratios in the q = M2/ M1 = 0.5-1.5 range. The system is found to be in a contact configuration. Independently of q, the best-fitting model solutions correspon…
No X-Ray Excess from the HESS J1741-302 Region, except for a New Intermediate Polar Candidate
Koyama, Katsuji; Matsumoto, Hironori; Uchiyama, Hideki +3 more
With the Suzaku satellite, we observed an unidentified TeV gamma-ray source, HESS J1741
Observing the reconnection region in a transequatorial loop system
Liu, Chang; Stenborg, Guillermo; Liu, Rui +4 more
A vertical current sheet is a crucial element in many flare/coronal mass ejection (CME) models. For the first time, Liu et al. reported a vertical current sheet directly imaged during the flare rising phase with the EUV Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO). As a follow-up study, here we present the comprehe…
Measurement of Intermittency of Anisotropic Magnetohydrodynamic Turbulence in High-speed Solar Wind
Wu, D. J.; Yang, L.; Luo, Q. Y.
We investigate the intermittency of anisotropic magnetohydrodynamic (MHD) turbulence in high-speed solar wind. Using the data recorded by the Ulysses spacecraft, we apply the Castaing function to model the probability density functions of the fluctuating magnetic field and calculate the magnetic structure functions (SFs) Sp of the order…