Science Archives Publication System

Energetic particle acceleration by coronal mass ejections

DOI: 10.1016/j.asr.2003.02.006 Bibcode: 2003AdSpR..32.2587K

Kahler, S. W.

The current paradigm for the source of large, gradual solar energetic particle (SEP) events is that theyare accelerated in coronal/interplanetary shocks driven by coronal mass ejections (CMEs). Early studies established that there is a rough correlation between the logs of the CME speed and the logs of the SEP intensities. Here I review two topics…

2003 • Advances in Space Research

SOHO 16

ISO-SWS calibration and the accurate modelling of cool-star atmospheres. III. A0 to G2 stars

DOI: 10.1051/0004-6361:20021790 Bibcode: 2003A&A...400..695D

Gustafsson, B.; Decin, L.; Vandenbussche, B. +4 more

Vega, Sirius, beta Leo, alpha Car and alpha Cen A belong to a sample of twenty stellar sources used for the calibration of the detectors of the Short-Wavelength Spectrometer on board the Infrared Space Observatory (ISO-SWS). While general problems with the calibration and with the theoretical modelling of these stars are reported in {Decin} et al.…

2003 • Astronomy and Astrophysics

ISO 16

Is B1422+231 a ``Golden Lens''?

DOI: 10.1086/375326 Bibcode: 2003AJ....126...29R

Raychaudhury, Somak; Saha, Prasenjit; Williams, Liliya L. R.

The object B1422+231 is a quadruply imaged QSO with an exceptionally large lensing contribution from group galaxies other than main lensing galaxy. We have detected diffuse X-rays from the galaxy group in archival Chandra observations; the inferred temperature is consistent with the published velocity dispersion. We explore the range of possible m…

2003 • The Astronomical Journal

eHST 16

Modulation of galactic cosmic rays at solar maximum: Observations

DOI: 10.1016/S0273-1177(03)00347-8 Bibcode: 2003AdSpR..32..603Z

Zhang, Ming

The spectra of galactic cosmic rays observed anywhere inside the heliosphere are modulated by the sun because the charged particles must fight their ways inward against the radially expanding solar wind. In the past half a century, galactic cosmic ray fluxes at Earth were continuously monitored by neutron monitors on the ground and instruments on …

2003 • Advances in Space Research

Ulysses 16

Observations of auroral broadband emissions by CLUSTER

DOI: 10.1029/2002GL016335 Bibcode: 2003GeoRL..30.1563W

Balogh, A.; Wahlund, J. -E.; Winningham, D. +16 more

We present the results of a study based on several events of broadband ULF/ELF emissions observed in the auroral region by the CLUSTER multi-spacecraft at distances around 4-5 R_E. These emissions, observed below the ion plasma frequency, are similar to the broadband emissions observed at lower altitudes (800-4000 km) by rockets (e.g. AM…

2003 • Geophysical Research Letters

Cluster 16

Interstellar H₂ in M 33 detected with FUSE

DOI: 10.1051/0004-6361:20021725 Bibcode: 2003A&A...398..983B

Wakker, B. P.; de Boer, K. S.; Marggraf, O. +2 more

FUSE spectra of the four brightest H Ii regions in M 33 show absorption by interstellar gas in the Galaxy and in M 33. On three lines of sight molecular hydrogen in M 33 is detected. This is the first measurement of diffuse H₂ in absorption in a Local Group galaxy other than the M…

2003 • Astronomy and Astrophysics

eHST 16

Observations of the upper solar chromosphere with SUMER

DOI: 10.1051/0004-6361:20030956 Bibcode: 2003A&A...408.1137W

Wilhelm, K.; Kalkofen, W.

The structure and dynamics of the solar chromosphere are still matters of debate. The chromospheric network reflecting the supergranulation of the outer convection zone of the Sun is a prominent feature of the lower solar atmosphere that extends into the transition zone between chromosphere and corona. In particular, the physics of the so-called `…

2003 • Astronomy and Astrophysics

SOHO 16

A Deep Chandra X-Ray Observation of NGC 1637

DOI: 10.1086/377474 Bibcode: 2003ApJ...595..727I

Leonard, Douglas C.; Wang, Q. Daniel; Immler, Stefan +1 more

We present a deep (168 ks) Chandra observation of the nearby face-on spiral galaxy NGC 1637 and study the X-ray source population. A total of 32 X-ray sources are detected within the D₂₅ ellipse of NGC 1637, each of which is found to be variable during the 629 day period covered by the observations. Deep Hubble Space Telescope WFPC2 obs…

2003 • The Astrophysical Journal

eHST 16

NGC 5953/54: BVRIHαJK photometry and [N II] Fabry-Perot interferometry. I. The data

DOI: 10.1051/0004-6361:20031445 Bibcode: 2003A&A...412..669H

Rosado, M.; Dultzin-Hacyan, D.; Fuentes-Carrera, I. +3 more

We present new BVRIHαJK imaging and [N II] scanning Fabry-Perot observations for the interacting galaxy pair NGC 5953/54. Morphology is reviewed using a combination of contrast-enhanced images, color-index maps, and geometric (radial µ ɛ = 1 - b/a, PA and a₄/a) profile parameters. Our data are complemented by archived V/R/H images…

2003 • Astronomy and Astrophysics

eHST 16

Constraints from Infrared Space Observatory Data on the Velocity Law and Clumpiness of WR 136

DOI: 10.1086/377597 Bibcode: 2003ApJ...596..538I

Ignace, R.; Cassinelli, J. P.; Quigley, M. F.

Observations with the Infrared Space Observatory (ISO) SWS spectrometer are used to constrain the velocity law and wind clumping of the well-studied Wolf-Rayet (W-R) star WR 136 (HD 192163, WN6). Because the free-free continuum opacity in W-R winds increases steadily with wavelength in the IR, each point in the continuous spectrum may be regarded …

2003 • The Astrophysical Journal

ISO 16