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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…
A new γ-ray pulsar: PSR 0740-28
Lu, Tan; Ma, Yu-qian; Song, Li-ming
We made a period folding analysis on two sets of COS-B observations and obtained a clearly pulsed phase structure in the γ-ray photons from the direction of PSR 0740-28. The phase diagrams from the two different data sets have a similar structure and the period and period rate are close to radio expectations. The probability of the two phase struc…
Is There a Drift of Anomalous Cosmic Ray Particles? Measurements of the ULYSSES EPAC Instrument
Fränz, M.; Keppler, E.; Quenby, J. J. +5 more