Search Publications
Long-duration Low-frequency Type III Bursts and Solar Energetic Particle Events
Gopalswamy, Nat; Mäkelä, Pertti
We analyzed the coronal mass ejections (CMEs), flares, and type II radio bursts associated with a set of three complex, long-duration, low-frequency (<14 MHz) type III bursts from active region 10588 in 2004 April. The durations were measured at 1 and 14 MHz using data from Wind/WAVES and were well above the threshold value (>15 minutes) nor…
A revision of the X-ray absorption nature of BALQSOs
Streblyanska, A.; Barcons, X.; Carrera, F. J. +1 more
Aims: Broad absorption-line quasars (BALQSOs) are key objects for studying the structure and emission/absorption properties of AGN. However, despite their fundamental importance, the properties of BALQSOs remain poorly understood. To investigate the X-ray nature of these sources, as well as the correlations between X-ray and rest-frame UV pro…
The Advection of Supergranules by the Sun's Axisymmetric Flows
Williams, Peter E.; Hathaway, David H.; Cuntz, Manfred +1 more
We show that the motions of supergranules are consistent with a model in which they are simply advected by the axisymmetric flows in the Sun's surface shear layer. We produce a 10 day series of simulated Doppler images at a 15 minute cadence that reproduces most spatial and temporal characteristics seen in the SOHO/MDI Doppler data. Our simulated …
Galaxies at a redshift of ~0.5 around three closely spaced quasar sightlines
Bechtold, Jill; Morris, Simon L.; Jannuzi, Buell T. +4 more
We examine the relationship between galaxies and the intergalactic medium at z < 1 using a group of three closely spaced background quasi-stellar objects (QSOs) with zem ~ 1 observed with the Hubble Space Telescope. Using a new grouping algorithm, we identify groups of galaxies and absorbers across the three QSO sightlines that may b…
The X-ray Properties of the Optically Brightest Mini-Bal Quasars from the Sloan Digital Sky Survey
Brandt, W. N.; Schneider, Donald P.; Garmire, Gordon P. +4 more
We have compiled a sample of 14 of the optically brightest radio-quiet quasars (mi <= 17.5 and z >= 1.9) in the Sloan Digital Sky Survey Data Release 5 quasar catalog that have C IV mini-broad absorption lines (mini-BALs) present in their spectra. X-ray data for 12 of the objects were obtained via a Chandra snapshot survey using A…
Radar absorption due to a corotating interaction region encounter with Mars detected by MARSIS
Gurnett, Donald A.; Frahm, Rudy A.; Nielsen, Erling +9 more
Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) is a subsurface and topside ionosphere radar sounder aboard the European Space Agency spacecraft Mars Express, in orbit at Mars since 25 December 2003, and in operation since 17 June 2005. The ionospheric sounding mode of MARSIS is capable of detecting the reflection of the sound…
The 35Cl/37Cl isotopic ratio in dense molecular clouds: HIFI observations of hydrogen chloride towards W3 A
de Graauw, T.; Caux, E.; Cernicharo, J. +9 more
We report on the detection with the HIFI instrument on board the Herschel satellite of the two hydrogen chloride isotopologues, H35Cl and H37Cl, towards the massive star-forming region W3 A. The J = 1-0 line of both species was observed with receiver 1b of the HIFI instrument at ~625.9 and ~624.9 GHz. The different hyperfine …
Interaction of Saturn's magnetosphere and its moons: 1. Interaction between corotating plasma and standard obstacles
Russell, C. T.; Khurana, K. K.; Gombosi, T. I. +3 more
The interaction of Saturn's inner magnetosphere with its moons ranges from the addition of significant quantities of gas, dust, and plasma, causing significant consequences for the dynamics and energetics of the entire Saturnian magnetosphere, to the simple absorption of plasma and energetic particles by the icy moons with non-electrically conduct…
Analysis of peculiarities of the stellar velocity field in the solar neighborhood
Bobylev, V. V.; Bajkova, A. T.; Mylläri, A. A.
Based on a new version of the Hipparcos catalogue and an updated Geneva-Copenhagen survey of F and G dwarfs, we analyze the space velocity field of ≈17 000 single stars in the solar neighborhood. The main known clumps, streams, and branches (Pleiades, Hyades, Sirius, Coma Berenices, Hercules, Wolf 630- α Ceti, and Arcturus) have been identified us…
Simultaneous observations of reconnection pulses at Cluster and their effects on the cusp aurora observed at the Chinese Yellow River Station
Lester, M.; Lockwood, M.; Dunlop, M. W. +11 more
While the Cluster spacecraft were located near the high-latitude magnetopause, between 1010 and 1040 UT on 16 January 2004, three typical flux transfer event (FTE) signatures were observed. During this interval, simultaneous and conjugated all-sky camera measurements, recorded at Yellow River Station, Svalbard, are available at 630.0 and 557.7 nm …