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Solar Wind Outflow in Polar Plumes from 1.05 to 2.4 Rsolar
Llebaria, A.; Abbo, L.; Antonucci, E. +2 more
An earlier publication (Paper I), which measured the outflow velocity in solar plumes out to 1.35 Rsolar using the Doppler dimming technique, has here been extended out to 2.4 Rsolar by including observations from SOHO UVCS. It is shown that plume outflow velocities, greater than interplumes at lower heights, have lower accel…
X-Ray Emission and Optical Polarization of V1432 Aquilae: An Asynchronous Polar
Singh, K. P.; Buckley, D. A. H.; Rana, V. R. +1 more
A detailed analysis of X-ray data obtained with ROSAT, ASCA, XMM-Newton, and the Rossi X-ray Timing Explorer (RXTE) for the asynchronous polar V1432 Aquilae is presented. An analysis of Stokes polarimetry data obtained from the South African Astronomical Observatory (SAAO) is also presented. Power spectra from long-baseline ROSAT data show a spin …
A Survey of Analogs to Weak Mg II Absorbers in the Present
Charlton, Jane C.; Narayanan, Anand; Lynch, Ryan +1 more
We present the results of a survey of the analogs of weak Mg II absorbers [rest-frame equivalent width Wr(2796)<0.3 Å] at 0<z<0.3. Our sample consisted of 25 HST STIS echelle quasar spectra (R=45,000), which covered Si II λ1260 and C II λ1335 over this redshift range. Using those similar transitions as tracers of Mg II facilita…
Integral Field Spectroscopy of 23 Spiral Bulges
Marconi, A.; Capetti, A.; Scarlata, C. +7 more
We have obtained integral-field spectroscopy for 23 spiral bulges using INTEGRAL on the William Herschel Telescope and SPIRAL on the Anglo-Australian Telescope. This is the first two-dimensional survey directed solely at the bulges of spiral galaxies. Eleven galaxies of the sample do not have previous measurements of the stellar velocity dispersio…
Multiwavelength Analysis of a Solar Flare on 2002 April 15
White, Stephen M.; Zhang, Jie; Holman, Gordon D. +1 more
We carried out a multiwavelength analysis of the solar limb flare on 2002 April 15. The observations all indicate that the flare occurred in an active region with an asymmetric dipole magnetic configuration. The earlier conclusion that magnetic reconnection is occurring in a large-scale current sheet in this flare is further supported by these obs…
V453 Oph: a s-process enriched, but carbon-deficient RV Tauri star of low intrinsic metallicity
van Winckel, H.; Siess, L.; Goriely, S. +2 more
This paper reports the detection of a heavy element enriched RV Tauri variable with an abundance pattern that differs significantly from a standard s-process enriched object:
On the formation of the high-altitude stagnant cusp: Cluster observations
Davies, J. A.; Wild, J. A.; Fazakerley, A. N. +7 more
On 16 March 2002, Cluster moved from nightside to dayside, across the high-altitude northern cusp during an extended period of relatively steady positive IMF BY and BZ. Combined Cluster and SuperDARN data imply the existence of two reconnection sites: in the high-latitude northern hemisphere dusk and southern hemisphere dawn …
Near-Infrared, Kilosecond Variability of the Wisps and Jet in the Crab Pulsar Wind Nebula
Romani, R. W.; Eikenberry, S. S.; Rigaut, F. +6 more
We present a time-lapse sequence of 20 near-infrared (J and K' band) snapshots of the central 20×20 of the Crab pulsar wind nebula, taken at subarcsecond resolution with the Hokupa`a/QUIRC adaptive optics camera on the Gemini North Telescope and sampled at intervals of 10 minutes and 24 hr. It is observed that the equatorial wisps and polar knots …
Rights and wrongs of the Hipparcos data. A critical quality assessment of the Hipparcos catalogue
van Leeuwen, F.
A critical assessment of the quality of the Hipparcos data, partly supported by a completely new analysis of the raw data, is presented with the aim of clarifying reliability issues that have surfaced since the publication of the Hipparcos catalogue in 1997. A number of defects in the data are identified, such as scan-phase discontinuities and eff…
Cluster observations of currents in the plasma sheet during reconnection
Balogh, A.; Fazakerley, A. N.; Klecker, B. +6 more
We present Cluster PEACE observations of parallel electron currents near a reversal of accelerated ion flows which indicated that the spacecraft were in the vicinity of an active reconnection X-line (XL). Moments calculated from the PEACE electron spectrometer 3D 4s resolution data are analysed. We surveyed the electron current structure to reveal…