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The soft X-ray coronal mass ejection above solar limb of 1998 April 23

Chen, Xiao-juan

Using the observational materials of SXT/HXT aboard satellite Yohkoh and the Nobeyama Radioheliograph (NoRH) on 1998-04-23, a comprehensive study of the soft X-ray coronal mass ejection (CME) above solar SE limb shows that there were two magnetic dipolar sources (MDSs), one magnetic capacity belt (MCB) between the MDSs, one neutral current sheet (…

Cassini/VIMS observations of the moon

Sotin, C.; Brown, R. H.; Baines, K. H. +19 more

In this paper, we present preliminary scientific results obtained from the analysis of VIMS (Visible and Infrared Mapping Spectrometer) lunar images and spectra. These data were obtained during the Cassini Earth flyby in August 1999. Spectral ratios have been produced in order to derive lunar mineralogical maps. Some spectra observed at the north-…

Characteristics of Active Galactic Nuclei in the Ultraviolet

Kautsch, S. J.; Zeilinger, W. W.

A sample of UV spectra of the central region of 28 early-type galaxies with signatures of nuclear activity is produced by collecting spectra from the on-line archive of the International Ultraviolet Explorer (IUE) satellite mission. We present a comparison of line flux measurements and the spectral energy distribution (SED) of these objects. The r…

Fishing for Delta Scuti stars in the Hipparcos photometric database

Percy, J. R.; Gilmour-Taylor, G.

Lyman α intensities in a polar coronal hole from a 2D model

Poletto, G.; Noci, G.; Nicolosi, P. +1 more

We simulate the coronal H I Lyman α intensity for heliocentric distances between 1.5 and 2.5 R_⊙, and latitudes between 90° (North pole) and 30°, making use of a 2D semiempirical coronal hole model. Observations are made with the UltraViolet Coronagraph Spectrometer (UVCS) on board the ESA-NASA solar satellite SOHO (SOlar and Heliospheri…

Variation of acoustic mode centroid frequencies over the solar cycle

Chaplin, W. J.; Elsworth, Y.; Appourchaux, T. +2 more

Together with a brief historical overview, we use high-quality helioseismic data collected by three different observational programmes during the declining phase of activity cycle 22, and a substantial portion of the rising phase of the current cycle (23), to study the phenomenological nature of the cycle-induced (centroid) eigenfrequencies. Our a…