Search Publications
The use of swept-charge devices in planetary analogue X-ray fluorescence studies
Smith, D. R.; Walker, T. E.
The Chandrayaan-1 X-ray Spectrometer (C1XS) was launched onboard the Indian Space Research Organisation (ISRO) Chandrayaan-1 lunar mission in October 2008. The instrument consisted of 24 swept-charge device (SCD) silicon X-ray detectors providing a total collecting area of ~ 24 cm2, corresponding to a 14° field of view (FWHM), with the …
Solar EUV flux variation and flare brightenings
Xie, Wenbin; Bao, Xingming
On 2010 February 8, the Extreme ultraviolet (EUV) flux variation in 195 Å and flare brightening has been examined in different sizes of active regions by using SOHO/EIT, MDI and Hα observational data. These three active regions represent a large active region with a sunspot group, a moderate active region without a sunspot and a small region with …
Three methods to identify local Galactic structures
Cubarsi, R.; Alcobé, S.; Vidojević, S. +1 more
Method one: by combining a sampling parameter related to an isolating integral of the stellar motion, an optimisation of the mixture approach, and a maximisation of the partition entropy for the constituent populations of the stellar sample. Method two: by segregating into different kinematical components in terms of the stellar orbital parameters…
Pulsar-Driven Jets in Supernovae, Gamma-Ray Bursts, and the Universe
Middleditch, John
The bipolarity of Supernova 1987A can be understood through its very early light curve observed from the CTIO 0.4-m telescope and IUE FES, and following speckle observations of the `Mystery Spot' by two groups. These indicate a highly directional beam/jet of light/particles, with initial collimation factors in excess of 10,000 and velocities in ex…
Superdiffusive Transport at Shocks in Space Plasmas
Zimbardo, Gaetano; Perri, Silvia
Superdiffusion is characterized by a nonlinear growth of the mean square deviation with time. Superdiffusive transport can be interpreted in terms of a Lévy random walk, a stochastic process where a power-law distribution of free path lengths is allowed. Considering particles accelerated at interplanetary shocks, it is found that their intensity p…
Catalog of stars with high proper motions (version 3.0)
Ivanov, G. A.
We compiled a catalog (containing astrometric and astrophysical characteristics) of 4 302 200 stars with high proper motions (no less than 40 mas/year) using original measurements of proper motions of stars from the catalogs FONAK 1.1, HIPPARCOS, "Tycho-2," UCAC2,3, CMC (STAR 11), PPM, PPMX, NPM1, NPM2, XZ80Q, Pul-3, Pul2, NLTT, GCVS, LHS, "Lowell…
Correction to “Dusty plasma in the vicinity of Enceladus”
Gurnett, D. A.; Persoon, A. M.; Kurth, W. S. +7 more
Abstract Available from http://www.agu.org
Photometry and Lightcurve Analysis of 7 Main-Belt Asteroids
Violante, R.; Leake, M. A.
We report the synodic periods and lightcurves for three main-belt asteroids and provide lightcurves for four other main-belt asteroids. 676 Melitta has a period of 8.35 ± 0.05 hours, with an amplitude of 0.056 ± 0.026 magnitude; 688 Melanie has a period of 16.10 ± 0.05 hours, and an amplitude of 0.091 ± 0.019 magnitude; 1677 Tycho Brahe has a peri…
New Solution of Earth Orientation Parameters 1900-1992 from Optical Astrometry, and its Linking to ICRF and ITRF
Vondrak, J.; Ron, C.; Stefka, V. +1 more
In preceding years we collected and re-analyzed the optical astrometry data from 33 observatories, using a unique celestial reference frame. It was realized first by the Hipparcos Catalogue, and then by a group of our own Earth Orientation Catalogs (EOC), being obtained by combining Hipparcos/Tycho data with older ground-based observations. EOC ca…