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ESA / IUE Under the Web

Barylak, M.; Ponz, J. D.; de La Fuente, A. +1 more

The X-Ray Spectra of Blazars: Analysis of the Complete EXOSAT Archive: Erratum

Giommi, Paolo; Barr, Paul; Sambruna, Rita M. +3 more

In the paper "The X-Ray Spectra of Blazars: Analysis of the Complete EXOSAT Archive" by Rita M. Sambruna, Paul Barr, Paolo Giommi, Laura Maraschi, Gianpiero Tagliaferri, and Aldo Treves (ApJS, 95,371 [1994]), the section regarding the object PKS 1510-08 (Section 4.4.14) contains an erroneous quotation. K. P. Singh, A.R. Rao, and M.N. Vahia (ApJ, 3…

Time Dependence of the UV Resonance Lines in the Cataclysmic Variable Star VW HYI

Özkan, M. T.; Ak, T.; Saygac, A. T. +2 more

In this work, we study orbital variations in the ultraviolet resonance lines of the SU UMa type dwarf nova VW Hyi examining spectra in the data archive of the International Ultraviolet Explorer (IUE). We show that VW Hyi exhibits an orbital and long term variability in terms of UV line profiles and continuum flux at 1450 A during superoutburst.

Interplanetary magnetic field during the Giotto encounter and the induced magnetosphere of comet Halley

Neubauer, F. M.; Israelevich, P. L.; Ershkovich, A. I.

The direction of the interplanetary magnetic field (IMF) which governs the orientation of the Halley's magnetosphere was restored. Giotto magnetic and plasma data were represented in the coordinate system rotating with the IMF.

Time Series Analysis of Low Energy Interplanetary Charged Particle Fluxes and Interplanetary Magnetic Field Data

Lanzerotti, L. J.; Thomson, D. J.; Maclennan, C.

Preliminary Results of Observations of Relationships Between Solar Radio Bursts, Sudden Commencements on Earth and Interplanetary Disturbances

Mann, G.; Jansen, F.; MacDowall, R. J. +2 more

Polar Rain Entry of Galactic Electrons into the Inner Heliosphere?

Christian, E. R.; Cooper, J. F.

The understanding of the relative intensity variations in cosmic ray ions and electrons with respect to solar modulation is a grand challenge for cosmic ray modulation theory. Although effects of the heliospheric neutral sheet, gradient-curvature drifts, and merged interaction regions provide qualitative explanations for observed solar cycle varia…

Ultraviolet eclipse observations of an accretion disk wind

Raymond, J. C.; Mason, K. O.; Cordova, F. A. +3 more

We present eclipse time series of ultraviolet Civ 1549Angstroms and Heii line profiles in the spectrum of the nova-like variable UX UMa, obtained using the Goddard High Resolution Spectrometer (GHRS) on board the Hubble Space Telescope (HST). These data provide important new insights into the origin of these mainly wind-formed lines. Specifically,…

Comparison of ground-based proper motions from meridian observations and Astrographic Catalogue plates with HIPPARCOS proper motions

Lindegren, L.; Bastian, U.; Crifo, F. +5 more

During the preparation of the Hipparcos Input Catalogue the Bordeaux automatic meridian circle has measured the positions of about 2800 stars in the declination zone -2degto +31deg. These stars concentrate mainly in the visual magnitude range 10mag to 11mag. In this zone the (x,y) measurements of all Astrographic Catalogue (AC) plates have been ne…

Charting the heliosphere in three dimensions

Neugebauer, M.

Space physicists continue their exploration of the solar system's home in the galaxy—that bubble of space, called the heliosphere, carved out of the interstellar medium by the solar wind. Studies of the heliospheric plasma are driven by the search for answers to questions such as: What mechanisms are responsible for the acceleration of the solar w…