Search Publications
Substorm activity in Venus's magnetotail
Barabash, S.; Futaana, Y.; Zhang, T. L. +5 more
The magnetotail of the induced magnetosphere of Venus is investigated through the magnetic field and plasma data of Venus Express. A comparison is made between two neutral sheet crossings. One crossing shows the magnetic field is rather quiet and the plasma instrument indicates a change from energetic (few 100 eV) to low energy (few 10 eV) ions. T…
Parameters of the visually close binary system Hip11253 (HD14874)
Al-Wardat, M. A.; Widyan, H.
The physical and geometrical parameters of the individual components of the binary system Hip11253 (HD14874) are estimated. We used the method described in previous papers, which consists in getting the best fit between the entire observational spectral energy distribution of the system and the synthetic ones, created from model atmospheres. The p…
Reformation of an oblique shock observed by Cluster
Lucek, E. A.; Schwartz, S. J.; Mazelle, C. +2 more
On 16 March 2005, the Cluster spacecraft crossed a shock almost at the transition between the quasi-perpendicular and quasi-parallel regimes ($\theta$Bn = 46°) preceded by an upstream low-frequency (≈0.02 Hz in the spacecraft frame) wave train observed for more than 10 mn. The wave semicycle nearest to the shock was found to grow in tim…
Reconstruction of two-dimensional coherent structures in ideal and resistive Hall MHD: The theory
Sonnerup, Bengt U. Ö.; Teh, Wai-Leong
We demonstrate that it is possible, in principle, to use data from a single spacecraft to produce reconstructions of two-dimensional, time-independent field and plasma structures in space, in circumstances where the Hall effect is important. Such reconstruction generates maps, in a limited region around the spacecraft path, of magnetic and electri…
TeV Gamma-Ray Emission from Vela X: Leptonic or Hadronic?
Zhang, L.; Yang, X. C.
We study nonthermal photon emission properties from Vela X in both a leptonic and a hadronic-leptonic model. In the leptonic model, it is difficult to reproduce the observed photon spectrum from X-ray to TeV bands using reasonable model parameters; the model results can compare with either the observed data at the TeV band (the total energy of ele…
Young pre-low-mass X-ray binaries in the propeller phase. Nature of the 6.7-h periodic X-ray source 1E 161348-5055 in RCW 103
Bhadkamkar, H.; Ghosh, P.
Context: Discovery of the 6.7-h periodicity in the X-ray source 1E 161348-5055 in RCW 103 has led to investigations of the nature of this periodicity.
Aims: To explore a model for 1E 161348-5055 wherein a fast-spinning neutron star with a magnetic field ~1012 G in a young pre-low-mass X-ray Binary (pre-LMXB) with an eccentric orbit …
Seasonal photometric variability of Titan, 1972-2006
Lockwood, G. W.; Thompson, D. T.
Measurements at Lowell Observatory of Titan in the b (472 nm) and y (551 nm) filters of the Strömgren photometric system at thirty four consecutive apparitions (282 nights) from 1971/72 to 2006 show a 10% sinusoidal variation that lags seasonal extremes by about 1/8 of a Titan year. The seasonal variations are asymmetric: the autumn lightcurve max…
Response of the solar atmosphere to magnetic field evolution in a coronal hole region
Zhang, J.; Li, L. P.; Yang, S. H. +2 more
Context: Coronal holes (CHs) are deemed to be the sources of the fast solar wind streams that lead to recurrent geomagnetic storms and have been intensively investigated, but not all the properties of them are well known.
Aims: We study the response of the solar atmosphere to the magnetic field evolution in a CH region, such as magnetic flux e…
An accretion disc origin for the `X-ray broad-line region' in 1H0707-495
Fabian, A. C.; Blustin, A. J.
We use a 380-ks X-ray Multi-Mirror Mission-Newton (XMM-Newton) high-resolution Reflection Grating Spectrometer (RGS) spectrum to look for narrow spectral features from the nuclear environment of 1H0707-495. We do not find any evidence of a line-of-sight ionized wind (warm absorber). We do, however, detect broad emission lines, of width ~5000 kms
Statistics of Density Fluctuations During the Transition from the Outer Solar Corona to the Interplanetary Space
Bruno, R.; Carbone, V.; Antonucci, E. +2 more
This paper investigates the evolution of the plasma density fluctuations of the fast and slow solar wind from the solar corona into the interplanetary space. The study is performed by comparing the low-frequency spectra and the phase correlation of the proton density oscillations, measured in the inner heliosphere with the Helios 2 in situ instrum…