Science Archives Publication System

Variability of solar eruptions during cycle 23

DOI: 10.1016/j.asr.2003.10.054 Bibcode: 2004AdSpR..34..391G

Howard, R. A.; Gopalswamy, N.; Yashiro, S. +1 more

We report on the solar cycle variation of the rate of coronal mass ejections (CMEs), their mean and median speeds, and the rate of type II radio bursts. We found that both CME rate and speed (mean and median) increased from solar minimum to maximum by factors of 10 and 2, respectively. The CME rate during solar maximum is nearly twice the rates qu…

2004 • Advances in Space Research

SOHO 36

Magnetic Footpoint Diffusion at the Sun and Its Relation to the Heliospheric Magnetic Field

DOI: 10.1086/424870 Bibcode: 2004ApJ...616..573G

Giacalone, J.; Jokipii, J. R.

We discuss the physics associated with the motion of the radial magnetic field footpoints at the Sun and its relation to the heliospheric magnetic field. Using the observed photospheric convection spectrum, we construct a model for the heliospheric magnetic field and relate it to observations made by Ulysses in the outer heliosphere in the fast so…

2004 • The Astrophysical Journal

Ulysses 36

The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda II

DOI: 10.1086/380613 Bibcode: 2004AJ....127..318P

Da Costa, G. S.; Pritzl, Barton J.; Armandroff, Taft E. +1 more

We present the results of a variable star search in Andromeda II, a dwarf spheroidal galaxy companion to M31, using Hubble Space Telescope Wide Field Planetary Camera 2 observations. Seventy-three variables were found, one of which is an anomalous Cepheid while the others are RR Lyrae stars. The anomalous Cepheid has properties consistent with tho…

2004 • The Astronomical Journal

eHST 36

XMM-Newton observations of high-luminosity radio-quiet quasi-stellar objects

DOI: 10.1111/j.1365-2966.2004.08051.x Bibcode: 2004MNRAS.353..133P

O'Brien, P. T.; Worrall, D. M.; Reeves, J. N. +2 more

XMM-Newton observations of five high-luminosity radio-quiet quasi-stellar objects (QSOs; Q 0144-3938, UM 269, PG 1634+706, SBS 0909+532 and PG 1247+267) are presented. Spectral energy distributions were calculated from the XMM-Newton European Photon Imaging Camera (EPIC) and Optical Monitor (OM) data, with bolometric luminosities estimated in the …

2004 • Monthly Notices of the Royal Astronomical Society

XMM-Newton 36

Relative contributions of sublimation and volcanoes to Io's atmosphere inferred from its plasma interaction during solar eclipse

DOI: 10.1016/j.icarus.2004.05.010 Bibcode: 2004Icar..171..411S

Saur, Joachim; Strobel, Darrell F.

We present a model that describes Io's delayed electrodynamic response to a temporal change in Io's atmosphere. Our model incorporates the relevant physical processes involved in Io's atmosphere-ionosphere-magnetosphere electrodynamic interaction to predict the far-ultraviolet (FUV) radiation as Io enters Jupiter's shadow and re-emerges into sunli…

2004 • Icarus

eHST 36

Physical Conditions in the Narrow-Line Region of M51

DOI: 10.1086/381680 Bibcode: 2004ApJ...603..463B

Kaiser, M. E.; Bradley, L. D.; Baan, W. A.

We have investigated the physical conditions in the narrow-line region (NLR) of M51 by using long-slit spectra obtained with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope and 3.6 cm radio continuum observations obtained with the Very Large Array.2 Emission-line diagnostics were employed for nine NLR clouds, which exten…

2004 • The Astrophysical Journal

eHST 36

Abundances of Planetary Nebulae IC 418, IC 2165 and NGC 5882

DOI: 10.1051/0004-6361:20040413 Bibcode: 2004A&A...423..593P

Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A. +1 more

The ISO and IUE spectra of the elliptical nebulae NGC 5882, IC 418 and IC 2165 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebulae is then calculated and compared to previous determinations. A disc…

2004 • Astronomy and Astrophysics

ISO IUE 36

Multisatellite measurements of electron phase space density gradients in the Earth's inner and outer magnetosphere

DOI: 10.1029/2003JA010294 Bibcode: 2004JGRA..109.5220T

Balogh, A.; Daly, P. W.; Dunlop, M. W. +4 more

The variability of the intensity of energetic (MeV) electrons in the Earth's radiation belts has been a renewed area of interest in recent years, yet a major outstanding question is the origin of these particles. In the current study we attempt to differentiate between local stochastic heating and radial diffusion or transport by investigating whe…

2004 • Journal of Geophysical Research (Space Physics)

Cluster 36

On the Nature of the LBV/WR Eclipsing Binary System HD 5980

Bibcode: 2004RMxAA..40..107K

Koenigsberger, G.

HD 5980 is a multiple star system in the Small Magellanic Cloud that underwent a luminous blue variable-like eruption in 1993-1994. The erupting star (star A) forms part of a close eclipsing binary whose companion's (star B) Wolf-Rayet nature has recently been questioned. The data analyzed in this paper cover the period 1979-2002, and support the …

2004 • Revista Mexicana de Astronomia y Astrofisica

eHST 36

Late evolution of the X-ray afterglow of GRB 030329

DOI: 10.1051/0004-6361:20041027 Bibcode: 2004A&A...423..861T

Ghirlanda, G.; Ghisellini, G.; Tiengo, A. +2 more

The X-ray afterglow of the Gamma-Ray Burst GRB 030329, associated with SN2003dh at z= 0.1685, has been observed with XMM-Newton 258 days after the burst explosion. A source with a flux of (6.2 ± 2.3) × 10^-16 erg cm^-2 s^-1 (0.5-2 keV) has been detected at the GRB position. This measurement, together with a re-analysi…

2004 • Astronomy and Astrophysics

XMM-Newton 36