Search Publications
Magnetic cloud and magnetosphere — Ionosphere response to the 6 November 1997 CME
Bochev, A. Z.; -Dimitrova, I. I. A.
In the present work we analyse the magnetic cloud (MC) at 1 AU on 9 November 1997. The appearance of a hotter and dense part (dense filament), with radial extent 10 6 km, immediately behind the frontal part of the MC, is a distinctive feature of the event. The INTERBALL - Aurora] Probe had a chance to observe field-aligned currents in t…
Azimuthal and Kinematic Segregation of Neutral and Molecular Gas in Arp 118: The Yin-Yang Galaxy NGC 1144
Appleton, P. N.; Charmandaris, V.; Gao, Yu +2 more
We present new high-resolution H I observations of the disk of the collisional infrared luminous (LIR=2.2×1011Lsolar) galaxy NGC 1144, which reveal an apparent large-scale azimuthal and kinematic segregation of neutral hydrogen relative to the molecular gas distribution. Even among violently collisional galaxies, t…
The extended structure of the Phoenix dwarf galaxy
Aparicio, Antonio; Hidalgo, Sebastian L.; MartÍnez-Delgado, David
The surface brightness profile in the V band of the Phoenix dwarf galaxy shows two stellar components: an inner one, which contains all the young stars of the galaxy, and an outer one predominantly populated by red stars. Deep color-magnitude diagrams (CMDs), based on Hubble Space Telescope (HST) observations and reaching the oldest turn-offs, are…
On a New Technique for Discovering Variable Stars
Mironov, A. V.; Zakharov, A. I.; Nikolaev, F. N.
A technique for discovering variable stars based on the calculation of the correlation coefficients is proposed. Applications of the technique are shown on the results of numerical experiments and on the Hipparcos photometric data.
Transition to solar minimum at high solar latitudes: Energetic particles from corotating interaction regions
Forsyth, R. J.; Sanderson, T. R.; Marsden, R. G. +2 more
One of the key questions to be addressed during the solar maximum phase of the Ulysses mission has been the nature of the ubiquitous energetic particle populations observed at all helio-latitudes from equator to poles. During the current, post-maximum phase of its mission, Ulysses has encountered the return to more stable solar wind, high speed st…
Propagation of CMEs in the interplanetary medium: Numerical and analytical results
Raga, A. C.; Lara, A.; Cantó, J. +2 more
We study the propagation of coronal mass ejections (CMES) from near the Sun to 1 AU by comparing results from two different models: a 1-D, hydrodynamic, single-fluid, numerical model (González-Esparza et al., 2003a) and an analytical model to study the dynamical evolution of supersonic velocity's fluctuations at the base of the solar wind applied …
First observations of the X-ray transient EXO 2030+375 with IBIS/ISGRI
Goldoni, P.; Falanga, M.; Goldwurm, A. +3 more
We present a first INTEGRAL observation of the 42 s transient X-ray pulsar EXO 2030+375 with IBIS/ISGRI. The source was detected during Cyg X-1 observations in December 2002. We analyzed observations during the outburst period from 9 to 21 December 2002 with a total exposure time of ~ 770 kilosec. EXO 2030+375 was almost always detected during sin…
Coronal mass ejection speeds measured in the solar corona using LASCO C2 and C3 images
Stenborg, G.; Gonzalez, W. D.; Dal Lago, A. +1 more
In this work we present height-time diagrams of 2 halo coronal mass ejections, observed on September 28th, 1997 and June 29th, 1999. The CMEs were observed by the Large Angle and Spectroscopic Coronagraph (LASCO), which observes the solar corona from 2 to 32 solar radii. To obtain these diagrams we divide the LASCO images of a given sequence in an…
The resolved red giant branches of E/S0 galaxies
Hopp, Ulrich; Schulte-Ladbeck, Regina E.; Drozdovsky, Igor O. +1 more
Formation paradigms for massive galaxies have long centered around two antipodal hypotheses – the monolithic-collapse and the accretion/merger scenarios. Empirical data on the stellar contents of galaxy halos is crucial in order to develop galaxy formation and assembly scenarios which have their root in observations, rather than in numerical simul…
Ultraviolet light curves of eclipsing binary stars. I. The catalogue of IUE data
Połubek, Grzegorz
The catalogue contains eclipsing and ellipsoidal variable stars observed by International Ultraviolet Explorer satellite (IUE). As examples we discuss IUE data for Algol (β Persei) and MR Cygni.