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Soho observations relating to the association between flares and coronal mass ejections
Harrison, R. A.
Campaigns to investigate the solar coronal mass ejection (CME) onset have been run using the Solar andHeliospheric Observatory (SOHO) since 1996. These have included coronagraph and extreme-ultraviolet (EUV) disc imaging, along with magnetic mapping of the photosphere, in concert with EUV and UV spectroscopic observations. These campaigns have inc…
Discovery of the eclipse in the symbiotic binary Z Andromedae
Skopal, A.
Our photometric observations of the symbiotic binary Z And during its recent (2000-2003) active phase revealed a minimum in the U, B and V light curves (LC) at the position of the inferior conjunction of its cool component (the orbital phase varphi = 0). This fact and the behaviour of colour indices suggest that the minimum was due to the eclipse …
When will Voyager 1 and 2 cross the termination shock?
Gloeckler, George; Izmodenov, Vlad; Malama, Yuri
Our Solar System moves through a warm (~6,500 K), partly ionized local interstellar cloud (LIC) with a relative speed of ~26 km/s. The solar wind interacts with the LIC to form a cavity around the Sun called the heliosphere. The solar wind meets the interstellar charged component at the heliopause, where solar wind pressure balances the pressure o…
A photometric monitoring of bright high-amplitude delta Scuti stars. II. Period updates for seven stars
Derekas, A.; Mészáros, Sz.; Rodríguez, E. +10 more
We present new photometric data for seven high-amplitude delta Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our observations are the first since the discovery of its pulsational nature from the Hipparcos data. The primary goal of this project was to update our k…
Io's auroral limb glow: Hubble Space Telescope FUV observations
Moos, H. W.; Strobel, D. F.; Retherford, K. D.
Observations of Io's FUV aurora were obtained using the Space Telescope Imaging Spectrograph (STIS) on several occasions between 1997 and 2000. The STIS first-order long-slit spectroscopy mode and 2″ wide slit were used to produce nearly monochromatic images of Io. These images reveal several distinct auroral features, including limb brightened em…
An XMM-Newton observation of the galaxy group MKW 4
Read, A. M.; O'Sullivan, E.; Ponman, T. J. +2 more
We present an X-ray study of the galaxy group or poor cluster MKW 4. Working with XMM-Newton data we examine the distribution and properties of the hot gas which makes up the group halo. The inner halo shows some signs of structure, with circular or elliptical beta models providing a poor fit to the surface brightness profile. This may be evidence…
Chandra observations of the Mice
Read, Andrew M.
Presented here are high spatial and spectral resolution Chandra X-ray observations of the famous interacting galaxy pair, the Mice, a system similar to, though less evolved than, the well-known Antennae galaxies. Previously unpublished ROSAT High Resolution Imager data of the system are also presented.
Starburst-driven galactic winds outflowi…Evidence for electrostatic decay in the solar wind at 5.2 AU
MacDowall, R. J.; Scime, E. E.; Thejappa, G. +1 more
The Unified Radio and Plasma wave Experiment (URAP) on the Ulysses spacecraft provides in situ observations of Langmuir waves and ion-acoustic waves in the solar wind. The observations presented in this paper were obtained at 5.2 AU from the Sun. Low-frequency (20-200 Hz in the spacecraft frame) electric field signals are observed coincident in ti…
A European Southern Observatory Very Large Telescope Survey of Near-Infrared (Z <= 25) Selected Galaxies at Redshifts 4.5 < z < 6: Constraining the Cosmic Star Formation Rate near the Reionization Epoch
Fontana, A.; Cristiani, S.; Giallongo, E. +4 more
We present the results of a Very Large Telescope (VLT) and Hubble Space Telescope imaging survey aimed at the identification of 4.5<z<6 galaxies. In the VLT data, a set of broadband and intermediate-band filters has been used to select 13 high-z candidates in a ZAB<=25 mag catalog, over an area of about 30 arcmin2. D…
Oscillations in the wings of sunspot transition region lines
Wilhelm, K.; Kjeldseth-Moe, O.; Brynildsen, N. +1 more
We explore a new approach to the investigation of optically thin emission lines by comparing the intensity variations in opposite wings of the spectral lines and apply the method to investigate the oscillations above sunspots. The observations show that it is easier to detect the 3 min oscillations above sunspots in the short wavelength (``blue'')…