Science Archives Publication System

Temporal variability of Mrk 421 from XMM-Newton observations

DOI: 10.1016/S1387-6473(03)00115-5 Bibcode: 2003NewAR..47..673B

Haberl, F.; Papadakis, I.; Brinkmann, W. +1 more

Mrk 421 has been observed several times as a calibration target for the instruments on board XMM-Newton. We have studied in some detail the temporal and spectral variability of the source during eight pointings, mainly from the PN camera, which provides the by far highest S/N data available for that source.

2003 • New Astronomy Reviews

XMM-Newton 0

Variations of the magnetic fields in large solar flares

DOI: 10.1023/A:1025559319434 Bibcode: 2003SSRv..107...99S

Donea, A. -C.; Schunker, H.

We present preliminary results from high resolution observations obtained with the Michelson Doppler Imager (MDI) instrument on the SOHO of two large solar flares of 14 July 2000 and 24 November 2000. We show that rapid variations of the line-of-sight magnetic field occured on a time scale of a few minutes during the flare explosions. The reversib…

2003 • Space Science Reviews

SOHO 0

Conditional Statistics of Magnetic Turbulence and the Lateral Transport of Solar Energetic Particles

Bibcode: 2003ICRC....6.3499C

Matthaeus, W. H.; Ruffolo, D.; Chuychai, Piyanate

The transport of energetic particles perpendicular to the mean magnetic field in space plasmas long has been viewed as a diffusive process. However, there is an apparent conflict between recent observations of solar energetic particles (SEP): 1) SEP from impulsive solar flares can exhibit "drop outs" in which the intensity near Earth repeatedly di…

2003 • International Cosmic Ray Conference

Ulysses 0

SHORT COMMUNICATION: Alternative representation of degradation corrections to space-based measurements of total solar irradiance

DOI: 10.1088/0026-1394/40/5/L02 Bibcode: 2003Metro..40L..11B

Bawagan, A. D. O.

Degradation corrections to solar irradiance measurements in space along with a postulated 'hyperbolic' fitting formula were recently reported (Fröhlich 2003 Metrologia 40 S60-5). A simpler, alternative formula based on broadband synchrotron exposure experiments on polymeric mixtures is presented. The alternative formula is shown to be simil…

2003 • Metrologia

SOHO 0

UV spectroscopy with SOHO

DOI: 10.1016/S0273-1177(03)00298-9 Bibcode: 2003AdSpR..32..965H

Brekke, P.; Harra, L. K.

The UV spectroscopy from SOHO has provided new and exciting results from a wide range of phenomena observed on the Sun. Determination of plasma parameters such as velocity, density, temperatures, line widths and abundances have provided new physical insight into fundamental problems in solar physics. These include magnetic reconnection, quiet Sun …

2003 • Advances in Space Research

SOHO 0

X-ray sources in globular clusters

DOI: 10.1002/asna.200310046 Bibcode: 2003AN....324..147W

Webb, N. A.; Barret, D.; Gendre, B.

We present XMM-Newton observations of 4 globular clusters (GCs): M 22 (NGC 6656); omega Centauri (NGC 5139) M 13 (NGC 6205); and NGC 6366. We provide evidence for close binaries in the centre of GCs, including an accreting neutron star and cataclysmic variables. We present results of a colour-colour study of the sources in the FOV and we make some…

2003 • Astronomische Nachrichten

XMM-Newton 0

Classification of Metal-Deficient Dwarfs in the Vilnius Photometric System

DOI: 10.1515/astro-2017-0079 Bibcode: 2003BaltA..12..547L

Bartkevičius, A.; Bartašiūtė, S.; Lazauskaitė, R.

Methods used for the quantitative classification of metal-deficient stars in the Vilnius photometric system are reviewed. We present a new calibration of absolute magnitudes for dwarfs and subdwarfs, based on Hipparcos parallaxes. The new classification scheme is applied to a sample of Population II visual binaries.

2003 • Baltic Astronomy

Hipparcos 0

XMM and CHANDRA High Resolution X-Ray Spectroscopy of Magnetic Cataclysmic Variables and Low Mass X-Ray Binaries

Bibcode: 2003OAP....16...18B

Haberl, F.; Burwitz, V.; Predehl, P. +3 more

2003 • Odessa Astronomical Publications

XMM-Newton 0

UV Piscium and the Radiative Flux Scale

DOI: 10.1023/A:1021331618901 Bibcode: 2003Ap&SS.283..225V

Vivekananda Rao, P.; Radhika, P.

Studies of eclipsing binaries with Hipparcos parallaxes are found to define a radiative flux relation for main sequence stars in the spectral range from B6 – F0which is about as well as to the stars derived from angular diameters. At lower temperatures the fluxes of the components fall below this curve which is caused due to the large intrinsic va…

2003 • Astrophysics and Space Science

Hipparcos 0

Perpendicular Diffusion and Drift of Solar Energetic Particles in Heliospheric Magnetic Fields

Bibcode: 2003ICRC....6.3495Z

McKibben, R. B.; Zhang, Ming; Jokipii, J. R.

We present evidence for large perpendicular diffusive flows of solar energetic particles. Using anisotropy measurements of 40-90 MeV protons from the July 14th, 2000 event obtained by HET on Ulysses, we find periods of first order anisotropy directed at significant angles to the local magnetic field, which can only be satisfactorily explained by p…

2003 • International Cosmic Ray Conference

Ulysses 0