Search Publications
On coronal streamer changes
Howard, R. A.; Gopalswamy, N.; Shibasaki, K. +3 more
Coronal streamer represents one of the pre-eruption configurations of coronal mass ejections (CMEs), because they overlie prominences and often possess all the substructures of CMEs. In this paper, we report on a study of streamer changes associated with prominence eruptions. The prominence eruptions and streamer changes were observed by the Nobey…
Reconsidering the origin of the X-ray emission lines in GRB 011211
Ghisellini, G.; Tavecchio, F.; Lazzati, D.
We reanalyze the XMM-Newton data of GRB 011211 showing that the spectral features, interpreted by Reeves et al. (\cite{Ree02}, \cite{Ree03}) as due to thermal emission from a collisionally ionized plasma, can be also reproduced by a reflection model (with ionization parameter ξ∼ 102). We discuss the implications of this interpretation, …
Multi-Wavelength Observation Results of the C5.6 Limb Flare of 1 August 2003
Li, Hui; You, Jianqi; Du, Qiusheng +1 more
We obtained a complete set of Hα, Ca Π 8542 å and He I 10830 å spectra and slit-jaw Hα images of the C5.6 limb flare of 1 August 2003 using the Multi-channel Infrared Solar Spectrograph (MISS) at Purple Mountain Observatory. This flare was also observed by the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) and partially by the Extre…
Solar Wind Electron Parameters from ULYSSES/URAP Quasi-Thermal Noise Measurements at Solar Maximum
Issautier, K.; Moncuquet, M.; Hoang, S.
We present the solar wind plasma parameters obtained from the Ulysses spacecraft during its second pole-to-pole fast latitude scan near the 2001 solar maximum. We study the solar wind properties from the electron density and core temperature measurements made by the radio receiver on Ulysses using the method of quasi-thermal noise spectroscopy. We…
Ion injections at auroral latitude during the March 31, 2001 magnetic storm observed by Cluster
Lundin, R.; Sauvaud, J. -A.; Fränz, M. +14 more
We present here simultaneous H+ and O+ ion dispersion signatures observed by three Cluster spacecraft above the northern auroral zone. These observations occur during strong geomagnetic activity (Kp = 9) and are consistent with a time-of-flight (TOF) dispersion of the ions. Using the TOF dispersion of H+…
The BM Ori System. I. Anomaly in the Radial Velocity
Klochkova, V. G.; Vitrichenko, E. A.
The radial velocities of the star BM Ori are determined from spectra obtained by the HST and IUE satellites, as well as from spectra obtained with the BTA telescope. An analysis of this data shows that the radial velocities of the main star and its satellite experience an irregular positive shift by ∼20-30 km/s. This fact can only be interpreted i…
Serpens X-1 observed by INTEGRAL
Palazzi, E.; Frontera, F.; Orlandini, M. +13 more
Here we report results of an INTEGRAL-AO1 observation of the X-ray burst and atoll source Ser X-1 performed in May 2003. The object was observed for a total on-source time of 400 ks but nearly 8° off-axis due to its amalgamation with an observation of SS 433, the pointing target source. Ser X-1 has been clearly detected up to 30 keV wit…
XMM-Newton observations of the relaxed, high-redshift galaxy cluster ClJ0046.3+8530 at z= 0.62
Gondoin, P.; Maughan, B. J.; Ebeling, H. +2 more
A detailed analysis of XMM-Newton observations of ClJ0046.3+8530 (z= 0.624) is presented. The cluster has a moderate temperature (kT= 4.1 +/- 0.3 keV) and appears to be relaxed. Emission is detected at >=3σ significance to a radius of 88 per cent of R200 (the radius enclosing an overdensity of 200 times the critical density at z= 0.6…
Kinematic Control of the Inertiality of ICRS Catalogs
Bobylev, V. V.
We perform a kinematic analysis of the HIPPARCOS and TRC proper motions of stars by using a linear Ogorodnikov-Milne model. All of the distant (r > 0.2 kpc) stars of the HIPPARCOS catalog have been found to rotate around the Galactic y axis with an angular velocity of M_{13}^- = -0.36 +/- 0.09 mas/yr. One of the causes of this rotation may be a…
RX J0256.5+0006 : A merging cluster of galaxies at z = 0.36 observed with XMM-NEWTON
Nichol, R. C.; Romer, A. K.; Majerowicz, S. +3 more
We present here a study based on XMM-NEWTON data of