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An analysis of a solar active region that produced many CMEs
Wang, Min; Xia, Zhi-guo; Zhang, Ba-rong +1 more
In April and May of 1998, six large burst events occurred one after the other in the active region AR8210. We have collected the data of this active region, including its soft X-rays, ultraviolet radiation, radio type-II and -IV bursts as well as its radioheliograph observations. It is found that the process of energy accumulation was rapid and th…
Touring the saturnian system: the atmospheres of titan and saturn
Owen, Tobias; Gautier, Daniel
This report follows the presentation originally given in the ESA Phase A Study for the Cassini Huygens Mission. The combination of the Huygens atmospheric probe into Titan's atmosphere with the Cassini orbiter allows for both in-situ and remote-sensing observations of Titan. This not only provides a rich harvest of data about Saturn's famous satel…
Sumer observations of solar transition region structures and dynamics
Dammasch, Ingolf E.; Wilhelm, Klaus
Several raster scans of the UV/EUV spectrometer SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on SOHO (the Solar and Heliospheric Observatory of ESA and NASA) in quiet-Sun regions were used to study the region between the chromosphere and the corona, i.e., the transition region with a temperature range between ≈ 30 000 K and 400 000 …
Extending the limits of globule detection. ISOPHOT Serendipity Survey observations of interstellar clouds II
Juvela, M.; Lisenfeld, U.; Kiss, Cs. +3 more
Small isolated clouds were discovered by the ISOPHOT 170 mu m Serendipity Survey (ISOSS) as faint I170<13 MJy sr-1 FIR sources. One of them is ISOSS J20246+6540, a cold (Td~ 14.5 K) pointlike ISOSS source without an IRAS pointsource counterpart. In the Digitized Sky Survey B band it is seen as a 3 arcmin size bi…
Characterization of the polar plumes from high cadence LASCO-C2 observations
Llebaria, A.; Lamy, P.; Thernisien, A.
In order to understand the spatio-temporal characteristics of polar plumes, we analyzed a sequence of continuous observations obtained with the SOHO/LASCO-C2 coronagraph over a period of 3 days with a time resolution of 10 minutes. We generated the time intensity diagram (TID) where the radiance of the plumes is displayed as a function of their an…
Multi-wavelength observations of a flare spray and CME of 1 October 2001
Li, Hui; You, Jianqi; Yu, Xingfeng +1 more
Using the Multi-channel Infrared Solar Spectrograph (MISS) at the Purple Mountain Observatory (PMO), we obtained the Hα , Ca Ii 8542 Å, He I 10 830 Å spectra and slit-jaw Hα images of a large dramatic flare spray near the south-west solar limb on 1 October 2001. For this event, we also got Extreme-Ultraviolet (EUV) images at 171 Å from TRACE and 1…
Analysis of a delta Scuti spectroscopic binary: CQ Lyncis
Carrier, F.; Udry, S.; Ginestet, N. +2 more
CQ Lyn is a new double-lined spectroscopic binary, composed of an Am delta Scuti and a solar-like star, with an orbital period of 12.50736 d and a zero-eccentricity. Physical parameters of both stars are well constrained. The characteristics of the primary are the following: M=1.714 Msun, Teff=6760 K, log L/Lsun= 1…
A lopsided chemically distinct nucleus in NGC 5055
Sil'chenko, O. K.; Afanasiev, V. L.
Kinematics and stellar population properties in the center of nearby Sbc galaxy NGC 5055 are studied with the Multi-Pupil Spectrograph of the 6 m telescope of the Special Astrophysical Observatory of Russian Academy of Sciences (SAO RAS). We confirm the rotation and stellar velocity dispersion asymmetries along the major axis reported earlier by o…
Overpressured emission-line clouds in the haloes of powerful radio galaxies
Tadhunter, C. N.; Robinson, T. G.; Dyson, J. E.
We present accurate measurements of the physical conditions in five powerful radio galaxies, as derived from deep, long-slit spectroscopic observations. All five objects show prominent extended line emission, and have X-ray luminosities similar to those of isolated elliptical galaxies. The data are high enough quality that the electron density and…
Nature of OH maser and SiO thermal emission towards carbon star: IRAS 05373-0810 (V1187 Ori)
Omont, A.; Szczerba, R.; Szymczak, M. +1 more
We present observational evidence that IRAS 05373-0810 is a genuine carbon star with an ISO SWS spectrum closely resembling that of R Scl. Modelling of the spectral energy distribution of IRAS 05373-0810 suggests that the star has luminosity of order of 8000 Lsun and loses mass at a rate of about 2-3*E-7 Msun yr