Search Publications
Space Weather Application Using Projected Velocity Asymmetry of Halo CMEs
Gopalswamy, N.; Michalek, G.; Yashiro, S.
Halo coronal mass ejections (HCMEs) originating from regions close to the center of the Sun are likely to be responsible for severe geomagnetic storms. It is important to predict geoeffectiveness of HCMEs by using observations when they are still near the Sun. Unfortunately, coronagraphic observations do not provide true speeds of CMEs because of …
The Observed Long- and Short-Term Phase Relation between the Toroidal and Poloidal Magnetic Fields in Cycle 23
Zharkova, V.; Zharkov, S.; Gavryuseva, E.
The observed phase relations between the weak background solar magnetic (poloidal) field and strong magnetic field associated with sunspots (toroidal field) measured at different latitudes are presented. For measurements of the solar magnetic field (SMF) the low-resolution images obtained from Wilcox Solar Observatory are used and the sunspot magn…
XMM-Newton and broad iron lines
Fabian, A. C.
Iron line emission is common in the X-ray spectra of accreting black holes. When the line emission is broad or variable then it is likely to originate from close to the black hole. X-ray irradiation of the accretion flow by the power-law X-ray continuum produces the X-ray `reflection' spectrum which includes the iron line. The shape and variabilit…
Broadband imaging and narrowband polarimetry of comet 73P/Schwassmann-Wachmann 3, components B and C, on 3, 4, 8, and 9 May 2006
Boehnhardt, H.; Borisov, G.; Bonev, T.
Context: The Jupiter family comet 73P/Schwassmann-Wachmann 3 (SW3) split into several pieces in 1995. Some of the original fragments were observed during the next apparition of the comet in 1999-2001. The last return of the comet in 2005-2006 was accompanied by tremendous further splitting of some SW3 components - in particular component B - into …
Energetic particle measurements from the Ulysses/COSPIN/LET instrument obtained during the August/September 2005 events
Forsyth, R. J.; Marsden, R. G.; Tranquille, C. +3 more
We report recent observations of energetic particles at energies 1-40 MeV/n made by the COSPIN/LET instrument onboard the Ulysses spacecraft during the period of intense solar activity in August/September 2005 during the declining phase of solar cycle 23. Ulysses, having started its climb to high southern latitudes for the third time, was located …
Advances in the Measurement of the Lense-Thirring Effect with Planetary Motions in the Field of the Sun
Iorio, Lorenzo
By processing more than 400,000 planetary observations of various types with the dynamical models of the EPM2006 ephemerides, E.V. Pitjeva recently estimated a correction to the canonical Newtonian-Einsteinian Venus' perihelion precession of -0.0004±0.0001 arcseconds per century. The prediction of general relativity for the Lense-Thirring precessi…
Bulges of disk galaxies at intermediate redshifts. I. Samples with and without bulges in the Groth Strip survey
Cristóbal-Hornillos, D.; Guzmán, R.; Balcells, M. +4 more
Context: Analysis of bulges to redshifts of up to z ∼ 1 have provided ambiguous results as to whether bulges as a class are old structures akin to elliptical galaxies or younger products of the evolution of their host disks.
Aims: We aim to define a sample of intermediate-z disk galaxies harbouring central bulges, and a complementary sample of…
Interaction evidence between Enceladus' atmosphere and Saturn's magnetosphere
Clarke, J. T.; Wannawichian, S.; Pontius, D. H.
Saturn's ultraviolet (UV) auroras are highly variable, with much of the activity believed to be controlled by conditions in the solar wind. Like Jupiter, Saturn is also expected to have an electrodynamic interaction between the planet's ionosphere and its satellites' atmospheres, a process that is responsible for the moon's auroral footprint compo…
Observations of the Gas Reservoir around a Star-Forming Galaxy in the Early Universe
Broadhurst, Tom; Frye, Brenda L.; Bowen, David V. +8 more
We present a high signal-to-noise spectrum of a bright galaxy at z = 4.9 in 14 hr of integration on VLT FORS2. This galaxy is extremely bright, i850 = 23.10 +/- 0.01, and is strongly lensed by the foreground massive galaxy cluster A1689 (z = 0.18). Stellar continuum is seen longward of the Lyα emission line at ~7100 Å, while intergalact…
Influence of large-scale interplanetary structures on energetic particle propagation: September 2004 event at Ulysses and ACE
Lario, D.; Lanzerotti, L. J.; Decker, R. B. +1 more
An intense solar energetic particle (SEP) event was detected in September 2004 by near-Earth spacecraft and by Ulysses at 5.4 AU. Characteristics of the intensity and anisotropy time profiles at both heliospheric locations were determined by the presence of a corotating low-density, low-speed, and low-proton-beta βp solar wind stream. T…