Science Archives Publication System

Cassini between Earth and asteroid belt: first in-situ charge measurements of interplanetary grains

DOI: 10.1016/j.icarus.2004.05.017 Bibcode: 2004Icar..171..317K

Kempf, S.; Krüger, H.; Srama, R. +9 more

Dust particles in interplanetary space are expected to charge up to an electrostatic potential of about +5 V mostly by the solar UV (Horányi, 1996, Annu. Rev. Astrophys. 34, 383). Since the dynamics of charged grains may be quite different from neutral particles, the knowledge of the grain charge Q_d is highly desirable. In the last two …

2004 • Icarus

Cassini 53

First observation of a solar X-class flare in the submillimeter range with KOSMA

DOI: 10.1051/0004-6361:20034624 Bibcode: 2004A&A...415.1123L

Miller, M.; Lüthi, T.; Magun, A.

We present the first solar flare observations with the KOSMA submillimeter telescope at 230 and 345 GHz. The GOES X2.0 flare on April 12, 2001 was also observed at millimeter and centimeter wavelengths, as well as in soft and hard X-rays. It exhibits both an impulsive phase of nonthermal gyrosynchrotron radiation and an extended phase of strong th…

2004 • Astronomy and Astrophysics

SOHO 52

Physical conditions in the planetary nebula NGC 6543

DOI: 10.1111/j.1365-2966.2004.07856.x Bibcode: 2004MNRAS.351.1026W

Liu, X. -W.; Wesson, R.

We present analysis of spectra and Hubble Space Telescope (HST) images of NGC 6543, the Cat's Eye Nebula. Using HST WFPC2 images taken in narrow-band filters isolating Hα and Hβ, we have produced an extinction map towards the nebula, and find that c(Hβ) is low, at ~0.1, and exhibits only very small spatial variations across the surface of the nebu…

2004 • Monthly Notices of the Royal Astronomical Society

IUE eHST 52

Powerful, obscured active galactic nuclei among X-ray hard, optically dim serendipitous Chandra sources

DOI: 10.1111/j.1365-2966.2004.07341.x Bibcode: 2004MNRAS.348..529G

Fabian, A. C.; Gandhi, P.; Johnstone, R. M. +1 more

We present a small sample of Chandra X-ray sources selected from the fields of ACIS observations which probe fluxes around the break in the hard band source counts. The targets of these fields include nine nearby galaxy clusters, one distant cluster and two powerful radio galaxy fields. The follow-up of this serendipitous sample was biased towards…

2004 • Monthly Notices of the Royal Astronomical Society

XMM-Newton 52

Unveiling the Central Parsec Region of an Active Galactic Nucleus: The Circinus Nucleus in the Near-Infrared with the Very Large Telescope

DOI: 10.1086/423422 Bibcode: 2004ApJ...614..135P

Lutz, D.; Rouan, D.; Meisenheimer, K. +12 more

VLT J- to M'-band adaptive optics observations of the Circinus galaxy on parsec scales resolve a central bright K_s-band source with a FWHM size of 1.9+/-0.6 pc. This source is only visible at wavelengths longward of 1.6 µm and coincides in position with the peak of the [Si VII] 2.48 µm coronal line emission. With respect to …

2004 • The Astrophysical Journal

eHST 52

Green Bank Telescope Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30

DOI: 10.1086/381730 Bibcode: 2004ApJ...604..328R

Ransom, Scott M.; Kaspi, Victoria M.; Hessels, Jason W. T. +4 more

We report the discovery of two binary millisecond pulsars in the core-collapsed globular cluster M30 using the Green Bank Telescope (GBT) at 20 cm. PSR J2140-2310A (M30A) is an eclipsing 11 ms pulsar in a 4 hr circular orbit, and PSR J2140-23B (M30B) is a 13 ms pulsar in an as yet undetermined but most likely highly eccentric (e>0.5) and relati…

2004 • The Astrophysical Journal

eHST 52

Location of the Optical Reverse Shock in the Cassiopeia A Supernova Remnant

DOI: 10.1086/423709 Bibcode: 2004ApJ...614..727M

Chevalier, Roger A.; Borkowski, Kazimierz J.; van den Bergh, Sidney +4 more

We use two epochs of Hubble Space Telescope WFPC2 images separated by 2 yr to determine the location and propagation of the reverse shock (RS) in the young supernova remnant Cassiopeia A (Cas A). The images trace optical line emission from fast-moving knots and filaments of highly processed ejecta as they cross the RS, become heated and compressed…

2004 • The Astrophysical Journal

eHST 52

Open solar flux estimates from near-Earth measurements of the interplanetary magnetic field: comparison of the first two perihelion passes of the Ulysses spacecraft

DOI: 10.5194/angeo-22-1395-2004 Bibcode: 2004AnGeo..22.1395L

Forsyth, R.; Balogh, A.; Lockwood, M. +1 more

Available from http://www.copernicus.org/site/EGU/annales/22/4/1395.htm?FrameEngine=false;

2004 • Annales Geophysicae

Ulysses 52

Height correction in the measurement of solar differential rotation determined by coronal bright points

DOI: 10.1051/0004-6361:20034082 Bibcode: 2004A&A...414..707B

Vršnak, B.; Wöhl, H.; Clette, F. +4 more

Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) are used to analyse solar differential rotation by tracing coronal bright points for the period June 4, 1998 to May 22, 1999. A method for the simultaneous determination of the true solar synodic rotation velo…

2004 • Astronomy and Astrophysics

SOHO 52

Tracking a major interplanetary disturbance with SMEI

DOI: 10.1029/2003GL018766 Bibcode: 2004GeoRL..31.2802T

Price, S.; Simnett, G. M.; Webb, D. F. +14 more

We present the first clear observations of an Earth-directed interplanetary disturbance tracked by the Solar Mass Ejection Imager (SMEI). We find that this event can be related to two halo CMEs seen at the Sun about 2 days earlier, and which merged in transit to 1 AU. The disturbance was seen about 16 hours before it reached Earth,and caused a sev…

2004 • Geophysical Research Letters

SOHO 52