Search Publications
Analysis and interpretation of a fast limb CME with eruptive prominence, C-flare, and EUV dimming
Filippov, B.; Koutchmy, S.; Golub, L. +3 more
Aims: Coronal mass ejections or CMEs are large dynamical solar-corona events. The mass balance and kinematics of a fast limb CME, including its prominence progenitor and the associated flare, will be compared with computed magnetic structures to look for their origin and effect.
Methods: Multi-wavelength ground-based and spaceborne observation…
On 17 22 January 2005 Events in Space Weather
Kudela, K.; Rybanský, M.; Dorotovič, I. +1 more
This contribution is a follow-up to the recent paper of Kuznetsov et al. (Contrib. Astron. Obs. Skalnaté Pleso36, 85, 2006) on the ground level enhancement (GLE) on 20 January 2005. We focused on a study of Forbush decrease (FD) of 17 - 18 and 21 - 22 January 2005, respectively. The data from the neutron monitor at Lomnický Štít (1 min counts) and…
Indications for 3 Mpc-scale large-scale structure associated with an X-ray luminous cluster of galaxies at z = 0.95
Böhringer, H.; Rosati, P.; Schwope, A. +5 more
Context: X-ray luminous clusters of galaxies at z ~ 1 are emerging as major cosmological probes and are fundamental tools to study the cosmic large-scale structure and environmental effects of galaxy evolution at large look-back times.
Aims: We present details of the newly-discovered galaxy cluster XMMU J0104.4-0630 at z = 0.947 and a probable…
Explosive Events and the Evolution of the Photospheric Magnetic Field
Muglach, K.
Transition region explosive events have long been suggested as direct signatures of magnetic reconnection in the solar atmosphere. In seeking further observational evidence to support this interpretation, we study the relation between explosive events and the evolution of the solar magnetic field as seen in line-of-sight photospheric magnetograms.…
Interpretation of high rate dust measurements with the Cassini dust detector CDA
Kempf, Sascha
For two years the cosmic dust analyser (CDA) onboard the Cassini spacecraft has been exploring the dust environment of Saturn [Srama, R., Kempf, S., Moragas-Klostermeyer, G., Helfert, S., Ahrens, T. J., Altobelli, N., Auer, S., Beckmann, U., Bradley, J.G., Burton, M., Dikarev, V.V., Economou, T., Fechtig, H., Green, S.F., Grande, M., Havnes, O., H…
From Titan’s tholins to Titan’s aerosols: Isotopic study and chemical evolution at Titan’s surface
Szopa, Cyril; Cernogora, Guy; Raulin, François +5 more
In the present work, we focused on the possible isotopic fractionation of carbon during the processes involved in the formation of Titan’s tholins. We present the first results obtained on the 12C/13C isotopic ratios measured on Titan’s tholins synthesized in laboratory with cold plasma discharges. Measurements of isotopic ra…
XMM-Newton Observations of IGR J00291+5934: Signs of a Thermal Spectral Component during Quiescence
Stella, Luigi; Campana, Sergio; D'Avanzo, Paolo +1 more
We present X-ray observations of the transient accretion-powered millisecond pulsar IGR J00291+5934 during quiescence. IGR J00291+5934 is the first source among accretion-powered millisecond pulsars to show signs of a thermal component in its quiescent spectrum. Fitting this component with a neutron star atmosphere or a blackbody model we obtain s…
Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars
Werner, K.; Poutanen, J.; Falanga, M. +1 more
Context: The majority of cataclysmic variables observed in the hard X-ray energy band are intermediate polars where the magnetic field is strong enough to channel the accreting matter to the magnetic poles of the white dwarf. A shock above the stellar surface heats the gas to fairly high temperatures (10-100 keV). The post-shock region cools mostl…
Bayesian Analysis of Solar Oscillations
Kucera, T.; Marsh, M. S.; Ireland, J.
A Bayesian probability-based approach is applied to the problem of detecting and parameterizing oscillations in the upper solar atmosphere for the first time. Due to its statistical origin, this method provides a mechanism for determining the number of oscillations present, gives precise estimates of the oscillation parameters with a self-consiste…
Probing solar and stellar interior dynamics and dynamo
Kosovichev, Alexander G.
Solar and stellar activity is a result of complex interaction between magnetic field, turbulent convection and differential rotation in a star’s interior. Magnetic field is believed to be generated by a dynamo process in the convection zone. It emerges on the surface forming sunspots and starspots. Localization of the magnetic spots and their evol…