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Large-scale Dimmings Produced by Solar Coronal Mass Ejections According to SOHO/EIT Data in Four EUV Lines
Grechnev, V. V.; Chertok, I. M.
SOHO/EIT data are used to analyze dimmings, or transient coronal holes (regions of reduced soft-X-ray and EUV emission), which are observed on the solar disk after halo-type coronal mass ejections (CMEs). Simultaneous observations in the 171 Å FeIX/X, 195 Å FeXII, and 284 Å FeIX coronal lines, which are sensitive to temperatures of T e ≈1.2, 1.5, …
Stellar sources in the ISOGAL intermediate bulge fields
Ganesh, S.; Omont, A.; Schultheis, M. +3 more
We present a study of ISOGAL sources in the ``intermediate'' galactic bulge (|l|< 2o, |b| ~ 1o-4o), observed by ISOCAM at 7 and 15 mu m. In combination with near-infrared (I, J, Ks) data of DENIS survey, complemented by 2MASS data, we discuss the nature of the ISOGAL sources, their luminosities, the i…
On the measurement bias of low-l solar p-mode excitation parameters: The impact of a ground-based window function
Chaplin, W. J.; Elsworth, Y.; Isaak, G. R. +4 more
We present a study of the impact of a ground-based, multi-station window function on estimates of the power and damping of low-l solar p modes extracted from fits to resonant structure in the frequency domain. The window functions come from six-site observations made by the Birmingham Solar-Oscillations Network (BiSON) over the 10-yr period beginn…
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 …