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Coronal Diagnostic Spectrometer Observations of Isothermal and Multithermal Coronal Loops
Mason, H. E.; Del Zanna, G.; Schmelz, J. T. +3 more
A data set obtained on 2003 January 17 with the Coronal Diagnostic Spectrometer (CDS) shows two loops sitting side by side on the solar disk. These loops are oriented along the CDS slit, so all pixels in each loop were observed simultaneously. So, although the instrument has a relatively slow time cadence, changes as a function of time that may oc…
Degree-one convection and the origin of Enceladus' dichotomy
Grott, M.; Hussmann, H.; Sohl, F.
Recently, the Cassini spacecraft has detected ongoing geologic activity near the south pole of Saturn's moon Enceladus. In contrast, the satellite's north-polar region is heavily cratered and appears to have been geologically inactive for a long time. We propose that this hemispheric dichotomy is caused by interior dynamics with degree-one convect…
Synthetic Mid-UV Spectroscopic Indices of Stars
Chavez, M.; Buzzoni, A.; Morossi, C. +4 more
Using the UVBLUE library of synthetic stellar spectra we have computed a set of mid-UV line and continuum spectroscopic indices. We explore their behavior in terms of the leading stellar parameters (Teff, logg). The overall result is that synthetic indices follow the general trends depicted by those computed from empirical databases. Se…
Detection of Surface Brightness Fluctuations in Elliptical Galaxies Imaged with the Advanced Camera for Surveys: B- and I-Band Measurements
Blakeslee, John P.; Cantiello, Michele; Raimondo, Gabriella +2 more
Taking advantage of the exceptional capabilities of the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST), we derive surface brightness fluctuation (SBF) measurements in the B and I bands from images of six elliptical galaxies with 1500<=cz<=3500. Given the low signal-to-noise ratio (S/N) of the SBF signal in the bl…
The acceleration characteristics of solar energetic particles in the 2000 July 14 event
Li, C.; Dai, Y.; Fang, C. +2 more
Aims:In large gradual solar energetic particle (SEP) events, especially the ground-level enhancement (GLE) events, where and how energetic particles are accelerated is still a problem.
Methods: By using imaging data from TRACE, Yohkoh/HXT, SOHO/MDI and SOHO/EIT, along with the data from the GOES, Apatity NM, and SOHO/LASCO CME catalog, the evo…
Huygens’ entry and descent through Titan's atmosphere—Methodology and results of the trajectory reconstruction
Lebreton, Jean-Pierre; Pérez-Ayúcar, Miguel; Sollazzo, Claudio +2 more
The European Space Agency's Huygens probe separated from the NASA Cassini spacecraft on 25 December 2004, after having been attached for a 7-year interplanetary journey and three orbits around Saturn. The probe reached the predefined NASA/ESA interface point on 14 January 2005 at 09:05:52.523 (UTC) and performed a successful entry and descent sequ…
Magnetic Solitons: Unified Mechanism for Moving Magnetic Features
Ryutova, M.; Hagenaar, H.
In a highly dynamic environment with sources and sinks of energy, flux tubes do not in general obey local conservation laws, nor do the ensembles of flux tubes that exhibit collective phenomena. We use the approach of energetically open dissipative systems to study nonlinear waves in flux tubes and their role in the dynamics of the overlying atmos…
Cassini/Cosmic Dust Analyzer in situ dust measurements between Jupiter and Saturn
Dikarev, V.; Kempf, S.; Srama, R. +5 more
We report an analysis of the Cosmic Dust Analyzer data obtained during the interplanetary cruise of the Cassini spacecraft between Jupiter and Saturn. The data cover the time period between the Jupiter flyby and the Saturn orbit insertion. Seventeen dust particles on bound and unbound (hyperbolic) orbits were also detected, with sizes in the submi…
Searching High-Redshift Large-Scale Structures: Photometry of Four Fields around Quasar Pairs at z ~ 1
Cypriano, E. S.; West, M.; Santos, W. A. +3 more
We have studied the photometric properties of four fields around the high-redshift quasar pairs QP 1310+0007, QP 1355-0032, QP 0110-0219, and QP 0114-3140 at z~1 with the aim of identifying large-scale structures (galaxy clusters or groups) around them. This sample was observed with the Gemini Multi-Object Spectograph (GMOS) at the Gemini North an…
New flaring of an ultraluminous X-ray source in NGC1365
Zezas, A.; La Parola, V.; Baldi, A. +4 more
We have studied a highly variable ultraluminous X-ray source (ULX) in the Fornax galaxy NGC1365, with a series of 12 Chandra and XMM-Newton observations between 2002 and 2006. In 2006 April, the source peaked at a luminosity ~3 × 1040erg s-1 in the 0.3-10 keV band (similar to the maximum luminosity found by ASCA in 1995), and…