Search Publications
The association of transequatorial loops in the solar corona with coronal mass ejection onset
Harra, L. K.; Matthews, S. A.; Foley, C. A. +1 more
It has been shown that transequatorial loops can disappear in association with the onset of a coronal mass ejection (CME) (Khan & Hudson \cite{khan}). We extend this result by considering a larger sample of transequatorial loop systems (TLS) to investigate their associated flaring and CME activity. We find 10 of a total 18 TLS considered here …
Detecting planetary transits in the presence of stellar variability. Optimal filtering and the use of colour information
Aigrain, S.; Favata, F.; Carpano, S.
Space-based photometric transit searches, such as the ESA mission Eddington (planned for launch in 2007), are expected to detect large numbers of terrestrial planets outside the solar system, including some Earth-like planets. Combining simplicity of concept with efficiency, the transit method consists in detecting the periodic luminosity drop in …
Transition Region Emission from Very Low Mass Stars
Hawley, Suzanne L.; Johns-Krull, Christopher M.
We present results from our Cycle 10 Hubble Space Telescope (HST) program to search for transition region emission in very low mass main-sequence stars in the spectral range M7-M9. Our program is aimed at (1) detecting emission and (2) distinguishing between flaring and quiescent origin for the emission. We have obtained HST/Space Telescope Imagin…
INTEGRAL Spectroscopy of IRAS 17208-0014: Implications for the Evolutionary Scenarios of Ultraluminous Infrared Galaxies
Arribas, Santiago; Colina, Luis
New integral field optical fiber spectroscopy obtained with the INTEGRAL system, together with archival HST WFPC2 and NICMOS images, has been used to investigate the ultraluminous infrared galaxy (ULIRG) IRAS 17208-0014, one of the coldest and most luminous objects in the IRAS 1 Jy sample. We have found that the optical nucleus is not coincident w…
What high altitude observations tell us about the auroral acceleration: A Cluster/DMSP conjunction
Janhunen, P.; Wahlund, J. -E.; Winningham, D. +10 more
Magnetic conjugate observations by Cluster and DMSP F14 satellites are used to study the field lines of auroral arc. Cluster is well above the acceleration region and observes upward keV ion beams and bipolar electric structures. The integrated potential at Cluster altitudes shows a dip that is consistent with the keV electron acceleration energy …
Themis, BBSO, MDI and trace observations of a filament eruption
Romano, P.; Yurchyshyn, V. B.; Contarino, L. +1 more
We describe a filament destabilization which occurred on 5 May 2001 in NOAA AR 9445, before a flare event. The analysis is based on Hα data acquired by THEMIS operating in IPM mode, Hα data and magnetograms obtained at the Big Bear Solar Observatory, MDI magnetograms and 171 Å images taken by TRACE. Observations at 171 Å show that ∼ 2.5 hours befo…
Modeling the propagation of solar energetic particles in corotating compression regions of solar wind
Torsti, J.; Kocharov, L.; Anttila, A. +2 more
We present the first modeling of solar energetic particle (SEP) events inside corotating compression regions. We consider gradual compressions in the interplanetary magnetic field brought on by interaction of the solar wind streams of different speed. The compression model is similar to that previously suggested for the acceleration of low-energy …
Potential Variations in the Interstellar N I Abundance
Andersson, B. -G.; McCandliss, Stephan R.; Moos, H. Warren +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph observations of the weak interstellar N I λ1160 doublet toward 17 high-density sight lines [N(Htot)>=1021 cm-2]. When combined with published data, our results reveal variations in the fractional N I abundance showi…
Observations of the neutral gas and dust in the radio galaxy 3C 305
Beswick, R.; Leahy, J. P.; Sparks, W. B. +5 more
We present MERLIN and Hubble Space Telescope (HST) observations of the central region of the nearby radio galaxy 3C 305 and use them to study the gas and dust in this object. The MERLIN observations are of neutral hydrogen (HI) absorption against the strong non-thermal 20 cm continuum seen towards the central 4 kpc of 3C 305. Our ~0.2 arcsec (160 …
Orbits and masses of twenty double stars discovered by Paul Couteau
Docobo, J. A.; Ling, J. F.
In this article we present the orbits and masses of 20 double stars discovered by P. Couteau at the Nice Observatory (France), namely WDS 01450+2703 (COU 750), 03321+4340 (1688), 03423+3141 (691), 06503+2409 (768), 12409+2708 (596),14138+3059 (606), 15390+2545 (612), 16584+3943 (1289), 17075+3810 (1291), 17221+2310 (415), 18035+ 4032 (1785), 18043…