Search Publications
Preliminary results on the fundamental parameters of the eclipsing binary V398 Lacertae
Frasca, A.; Soydugan, F.; Çakırlı, Ö. +2 more
The Hipparcos Space Astrometry Mission photometric observations of V398 Lac, led to the discovery of its variability, allowing to classify it as an eclipsing binary with an orbital period of about 5.4 days. This prompted us to acquire high-resolution échelle spectra with the aim of performing accurate radial velocity measurements and to determine …
Introduction to special section: OMEGA/Mars Express Mars Surface and Atmospheric Properties
Bibring, Jean-Pierre
Abstract Available from http://www.agu.org
Development dynamics of intense solar proton flares
Zimovets, I. V.; Struminsky, A. B.
We consider the relationship of electromagnetic radiation in the three most intense flares of solar cycle 23, more specifically, those of October 28, 2003, January 20, 2005, and September 7, 2005, to the acceleration and release of protons into interplanetary space. The impulsive phase of these flares lasted ∼ 20 min and consisted of at least thre…
Simulated Annealing and Bayesian Posterior Distribution Analysis Applied to Spectral Emission Line Fitting
Ireland, Jack
Spectral-line fitting problems are extremely common in all remote-sensing disciplines, solar physics included. Spectra in solar physics are frequently parameterized by using a model for the background and the emission lines, and various computational techniques are used to find values to the parameters given the data. However, the most commonly-us…
Initial mass function effects on the colour evolution of disk galaxies
Samland, M.; Kautsch, S. J.; Westera, P. +2 more
Aims:In this work, we want to find out if the IMF can be determined from colour images, integrated colours, or mass-to-light ratios, especially at high redshift, where galaxies cannot be resolved into individual stars, which would enable us to investigate dependencies of the IMF on cosmological epoch.
Methods: We use chemo-dynamical models to …
The correlation between coronal Doppler shifts and the supergranular network
Peter, H.; Lemaire, P.; Aiouaz, T.
The Effect of Proton Temperature Anisotropy on the Electron Heat Flux Dissipation in Solar Coronal Holes
Markovskii, S. A.
A possible source of the ion cyclotron waves that energize the protons in the fast solar wind is the electron heat flux launched by reconnection events at the base of coronal holes. A strong enough heat flux becomes unstable and generates cyclotron waves that interact with the protons. When the protons are energized via the cyclotron resonance, th…
Identification of a Peculiar Radio Source in the Aftermath of Large Coronal Mass Ejection Events
Vourlidas, Angelos; Démoulin, Pascal; Hoang, Sang +1 more
We report the discovery of a new radio feature associated with coronal mass ejection (CME) events. The feature is a low-frequency (<1 MHz), relatively wide (~300 kHz) continuum that appears just after the main phase of the eruptive event, lasts for several hours, and exhibits a slow negative frequency drift. So far, we have identified this radi…
A 12 µm ISOCAM survey of the ESO-Sculptor field. Data reduction and analysis
Seymour, N.; Rocca-Volmerange, B.; de Lapparent, V.
We present a detailed reduction of a mid-infrared 12 µm (LW10 filter) ISOCAM open time observation performed on the ESO-Sculptor Survey field (Arnouts et al. 1997, A&AS, 124, 163). A complete catalogue of 142 sources (120 galaxies and 22 stars), detected with high significance (equivalent to 5σ), is presented above an integrated flux den…
Some properties of the latitude brightness distributions in the K and F coronae according to SOHO/LASCO data
Fainshtein, V. G.
We have obtained continuous latitude distributions of the K and F corona brightnesses at various distances for the first time, using both the Hayes—Vourlidas—Howard method and our own recently proposed, simple technique for separating the emission of the K and F coronas. Data from the LASCO C2 and C3 coronagraphs are analyzed. Variations of the an…