Search Publications
67P/Churyumov Gerasimenko nucleus model: Portrayal of the Rosetta target
Coradini, A.; De Sanctis, M. C.; Capria, M. T.
Rosetta is a cornerstone ESA mission dedicated to the detailed study of a comet nucleus before and after the onset of activity. Comet 67P/Churyumov-Gerasimenko is the new Rosetta target. At the moment, little is known about this comet, but the successful design of the ROSETTA mission requires some preliminary knowledge of the comet's physical para…
Comparison of surface temperatures measured by the Planetary Fourier Spectrometer (PFS) on Mars Express with predictions from the Berlin Mars near Surface Thermal model (BMST) for the BEAGLE 2 landing site in Isidis Planitia
Arnold, G.; Formisano, V.; Giuranna, M. +4 more
The Isidis Plantita region on Mars is a landing site favored by engineers for its inherent safety. The landing site of Beagle 2 was in this area, as was one of the prime backup landing sites for the Mars Exploration Rover Spirit. Therefore, it seems likely that for future lander missions to Mars this area will be on the shortlist. Within its first…
Why are there stationary EIT wave fronts
Chen, P. F.; Shibata, K.; Fang, C.
EIT waves are often observed to be propagating EUV enhancements followed by an expanding dimming region after the launch of CMEs. It was widely assumed that they are the coronal counterparts of the chromospheric Moreton waves, though the former are three or more times slower. The existence of a stationary “EIT wave” front in some events, however, …
INTEGRAL and RXTE power spectra of Cygnus X-1
Nowak, M. A.; Wilms, J.; Pottschmidt, K. +3 more
We evaluate 0.03 20 Hz power spectra of the bright black hole binary Cyg X-1 obtained from non-deconvolved INTEGRAL-ISGRI event data. The ISGRI power spectra are compared to contemporary RXTE-PCA ones in the same hard X-ray energy band of 15 70 keV. They agree well in shape. Since the ISGRI power spectrum of Cyg X-1 is not background corrected it …
Objective CME detection over the solar cycle: A first attempt
Berghmans, D.; Robbrecht, E.; van der Linden, R. A. M.
We recently developed a software package to autonomously detect coronal mass ejections (CMEs) in image sequences from large angle spectrometric coronagraph (LASCO). The detection is not done in the original images, instead we detect bright ridges in (time, height) plots using a modified version of the Hough transform. Experimental results on real-…
Multidimensional physicochemical models of the near-nucleus coma: Present achievements and requested future developments
Crifo, J. -F.
The published multidimensional physicochemical simulations of the near-nucleus coma (hereafter "NNC") are reviewed. The goals of these simulations are to understand the physical origin of the observed NNC structure(s), and to relate the latter to properties of the nucleus - an inference which is often done on the basis of subjective impressions on…
An archival study of extended X-ray emission from classical and recurrent novae
Balman, Şölen
I discuss morphology and spectrum of the first resolved and detected classical nova shell in the X-rays - the remnant of GK Persei (1901). The existence of such a nebulosity brings about the possibility of other nova remnants emitting X-rays. I calculate that the X-ray luminosity should be about 10 26-10 33 ergs s -1
Injection and propagation of solar protons to high heliospheric latitudes: Ulysses Ket observations
Kunow, H.; Heber, B.; Müller-Mellin, R. +3 more
The Ulysses spacecraft at high heliographic latitudes has detected eight large solar energetic particle events during the recent solar maximum in 2000 and 2001 years. These events are easily identified with famous episodes of the solar activity and the corresponding SEP events near the Earth. Analyzing the absolute intensities of ∼40 100 MeV proto…
The changing topology of the duskside magnetopause boundary layer in relation to IMF orientation
Farrugia, C. J.; Wild, J. A.; Kistler, L. M. +9 more
On 7 December 2000, Cluster made an extended outbound radial traversal of the duskside magnetopause boundary layer. The long duration of the crossing, during which Cluster spent several hours within 2RE of the nominal magnetopause, allows us to deconvolve the structure of this boundary layer in its dependence on interplanetary parameter…
Solar VUV measurements obtained by SOHO instruments and their radiometric calibration
Wilhelm, Klaus
The Solar and Heliospheric Observatory (SOHO) of ESA and NASA is equipped with a suite of instruments capable of observing the Sun from the core to the outer corona. Several of these instruments detect radiation in the vacuum-ultraviolet (VUV) wavelength range (shortwards of 200 nm), where precise and accurate radiometric measurements are of extre…