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See detailObservations d'occultation d'étoiles par la Lune et d'éclipses des satellites de Jupiter
Folie, François ULg

in Astronomische Nachrichten (1886), 115(2754), 299-300

Table resuming a series of observations of stars occultation made by the Moon and Jupiter moon eclipses produced by E. Stuyvaert at the Brussels Royal Observatory in 1885 and 1886 and communicated by ... [more ▼]

Table resuming a series of observations of stars occultation made by the Moon and Jupiter moon eclipses produced by E. Stuyvaert at the Brussels Royal Observatory in 1885 and 1886 and communicated by François Folie. [less ▲]

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See detailObservations de comètes et d'occultations d'étoiles par la lune
Folie, François ULg

in Astronomische Nachrichten (1886), 114(2718), 91-94

Table resuming a series of observations of comets and stars occultation made by the Moon produced by E. Stuyvaert at the Brussels Royal Observatory in 1885 and 1886 and communicated by François Folie.

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See detailObservations de comètes et de planètes
Folie, François ULg

in Astronomische Nachrichten (1887), 117(2793), 145-147

Table resuming a series comets and planets observations produced by E. Stuyvaert at the Brussels Royal Observatory in 1885 and 1886 and communicated by François Folie.

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See detailObservations de coupes dans la terrasse T3 dans la vallée du Niger en aval de Niamey
Willems, Luc ULg; Bergoing, Jean-Pierre

in Revue de Géographie Alpine (1994), 5

Dans la région de Niamey, l'étendue et le nombre d'affleurements du complexe T3, appelé aussi terrasse moyenne, permettent de dresser une chronologie relative des événements climatiques survenus dans la ... [more ▼]

Dans la région de Niamey, l'étendue et le nombre d'affleurements du complexe T3, appelé aussi terrasse moyenne, permettent de dresser une chronologie relative des événements climatiques survenus dans la région durant son édification. Une étude systématique révèle une grande diversité dans les dépôts souvent assimilable aux variations locales de sédimentation. Cependant, cinq épisodes majeurs dans l'édification du complexe peuvent être dégagés et correspondent à autant de fluctuations climatiques durant une période qui s'étendrait de 20 000 à 12 000 BP. La découverte et l'observation de diaclases ainsi que des phénomènes de soutirage dans les dépôts pléistocènes montrent le rôle important qu'a pu jouer la fracturation du socle birrimien sur l'ensemble de la morphologie actuelle de la région de Niamey, en particulier sur le réseau hydrographique. [less ▲]

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See detailObservations de deux polarissimes à Uccle
Folie, François ULg

in Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique (1894), 3e série, t. 27(4), 482-491

During observations, the author notices the existence of two variable stars and records it in his notes.

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See detailObservations de l'étoile de Gore près de χ1 Orionis
Folie, François ULg

in Astronomische Nachrichten (1887), 116(2769), 137-140

Observations of the Gore’s stars near χ1 Orionis made by the author in 1885 and 1886.

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See detailObservations de l’Univers lointain avec le Télescope Spatial Hubble
Surdej, Jean ULg

in Nouvelles de la Science et des Technologies (1990), 8(Nø3-4), 87-92

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See detailObservations de la Comète 1887 IV, d'occultations d'étoiles par la Lune et d'éclipses des Satellites de Jupiter
Folie, François ULg

in Astronomische Nachrichten (1888), 119(2837), 75-78

Table resuming a series of Comet 1887 IV observations, of stars occultation by the Moon and Jupiter moons eclipses produced by E. Stuyvaert at the Brussels Royal Observatory in 1887 and communicated by ... [more ▼]

Table resuming a series of Comet 1887 IV observations, of stars occultation by the Moon and Jupiter moons eclipses produced by E. Stuyvaert at the Brussels Royal Observatory in 1887 and communicated by François Folie. [less ▲]

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See detailObservations de la Comète 1888 III (Brooks Août 7)
Folie, François ULg

in Astronomische Nachrichten (1888), 120(2872), 253-254

Table resuming a series of Comet 1888 III observations produced by E. Stuyvaert at the Brussels Royal Observatory and communicated by François Folie.

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See detailObservations des phénomènes naturels en avril 1896
Folie, François ULg

in Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique (1896), 3e série, t. 31

The author resumes various observations of natural phenomena which occurred in April 1896.

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See detailObservations des phénomènes naturels en mars 1896
Folie, François ULg

in Bulletins de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique (1896), 3e série, t. 31

The author resumes various observations of natural phenomena which occurred in March 1896

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See detailObservations of CH4, CH3D and H2CO at Ile de La Réunion from ground-based FTIR and MAXDOAS campaign measurements
Vigouroux, Corinne; De Mazière, Martine; Van Roozendael, Michel et al

Poster (2007, November)

Ile de La Réunion (21°S, 55°E) is candidate to become a primary station the ground-based Network for the Detection of Atmospheric Composition Change (NDACC) which was formed to provide long-term ... [more ▼]

Ile de La Réunion (21°S, 55°E) is candidate to become a primary station the ground-based Network for the Detection of Atmospheric Composition Change (NDACC) which was formed to provide long-term monitoring of atmospheric trace gases at globally distributed sites. Ground-based network data are also very valuable for the validation of satellite data, such as SCIAMACHY, ACE-FTS and IASI. Up to now, only a few NDACC stations are located in the Southern Hemisphere, and none of them is at subtropical latitude. Three campaigns of FTIR measurements were made at the Ile de La Réunion in preparation of a near future permanent installation, namely in October 2002, from August to October 2004, and from May to November 2007. A UV-visible Multi-Axis DOAS (MAXDOAS) instrument was operated at the same site from July 2004 to June 2005. The inversion algorithms for both the MAXDOAS and FTIR spectral data analyses use the Optimal Estimation Method to derive information about the vertical distribution of the target gases. We will present the vertical profiles and total columns of the greenhouse gas CH4 and its isotopologue CH3D, obtained from the FTIR measurements. For the latter, the number of degrees of freedom for signal is close to one, limiting the information to the total column abundance. Early comparisons with correlative measurements from satellite data will be discussed. Formaldehyde (H2CO) is a source of HOx and an indicator for biogenic emissions, biomass burning, and anthropogenic pollution. It can be measured by both the FTIR and UV-Visible MAXDOAS instruments. The total columns obtained by the two techniques in the common period of measurements August-October 2004 will be discussed. We will also show the comparisons of the time series for formaldehyde from both instruments with correlative SCIAMACHY data above La Réunion. [less ▲]

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See detailObservations of CN and dust activity of comet 9P/Tempel 1 around Deep Impact
Rauer, H.; Weiler, M.; Sterken, C. et al

in Astronomy and Astrophysics (2006), 459

Aims.We present observations of CN emission and the scattered solar light on cometary dust particles around the impact time of the Deep Space spacecraft (NASA) into the nucleus of comet 9P/Tempel 1. The ... [more ▼]

Aims.We present observations of CN emission and the scattered solar light on cometary dust particles around the impact time of the Deep Space spacecraft (NASA) into the nucleus of comet 9P/Tempel 1. The purpose of the observations was to compare post-impact activity to the conditions pre-impact to search for new spectral emission lines after impact, to quantify the increase in gas activity due to the impact and to study the long-term activity changes.<BR /> Methods: .We performed long-slit spectroscopy observations of comet 9P/Tempel 1 at the VLT, ESO, using the FORS instruments from July 2 to July 12, 2005. A wavelengths range of 370-920 nm was covered using two grisms. Four different position angle settings of the slit were applied each night with the projected Sun-comet line as standard setting, for which we report results here.<BR /> Results: .The optical spectra of comet 9P/Tempel 1 showed the usual emission bands in the optical wavelengths range of the radicals: CN, C3, C2 and NH2. No new emission bands were detected after impact. The ejecta cloud of gas and dust caused by the impacting spacecraft into the cometary nucleus could be followed over the observing period. The projected expansion velocities have been determined. The night after impact we observed about (3.9 ± 1.2) × 10[SUP]29[/SUP] molecules of the CN parent in the ejected cloud. However, after five days the appearance of the gas and dust coma was back to pre-impact conditions. <BR /> [less ▲]

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See detailObservations of Comet 73P/SW3 close to its closest approach to the Earth.
Tozzi, G. P.; Bagnulo, S.; Boehnhardt, H. et al

in European Planetary Science Congress 2006 (2006)

In May 2006 comet 73P/SW3 passed at less than 0.1 AU from Earth providing us an unique opportunity for high spatial resolution study of its coma. This event was expected to be particularly interesting ... [more ▼]

In May 2006 comet 73P/SW3 passed at less than 0.1 AU from Earth providing us an unique opportunity for high spatial resolution study of its coma. This event was expected to be particularly interesting because the comet had broken apart in 3-4 fragments in 1996. The 2006 apparition has been even more interesting because the fragments produced in 1996, when approaching the Sun, were continuously breaking apart. This process resulted in many small sub-fragments and in the injection in the coma of fresh material, coming from the interior of the nuclei, giving the possibility to study this uncontaminated material. The breaking fragments have been observed at ESO in the visible and near-IR with the aim of analyzing this fresh solid component of the coma in search of possible presence of organic solids. In the presentation we will report preliminary results of this campaign. [less ▲]

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See detailObservations of comet McNaught from La Silla
Snodgrass, C.; Jehin, Emmanuel ULg; Fitzsimmons, A. et al

Poster (2007)

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See detailObservations of Coronal Structures Above an Active Region by EIT and Implications for Coronal Energy Deposition
Neupert, W. M.; Newmark, J.; Delaboudinière, J.-P. et al

in Solar Physics (1998), 183

Solar EUV images recorded by the EUV Imaging Telescope (EIT) on SOHO have been used to evaluate temperature and density as a function of position in two largescale features in the corona observed in the ... [more ▼]

Solar EUV images recorded by the EUV Imaging Telescope (EIT) on SOHO have been used to evaluate temperature and density as a function of position in two largescale features in the corona observed in the temperature range of 1.0-2.0MK. Such observations permit estimates of longitudinal temperature gradients (if present) in the corona and, consequently, estimates of thermal conduction and radiative losses as a function of position in the features. We examine two relatively cool features as recorded in EIT's Feix/x (171Å) and Fexii (195Å) bands in a decaying active region. The first is a long-lived loop-like feature with one leg, ending in the active region, much more prominent than one or more distant footpoints assumed to be rooted in regions of weakly enhanced field. The other is a near-radial feature, observed at the West limb, which may be either the base of a very high loop or the base of a helmet streamer. We evaluate energy requirements to support a steady-state energy balance in these features and find in both instances that downward thermal conductive losses (at heights above the transition region) are inadequate to support local radiative losses, which are the predominant loss mechanism. The requirement that a coronal energy deposition rate proportional to the square of the ambient electron density (or pressure) is present in these cool coronal features provides an additional constraint on coronal heating mechanisms. [less ▲]

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See detailObservations of equatorward patchy auroral ultraviolet emissions
Dumont, Maïté ULg; Grodent, Denis ULg; Radioti, Aikaterini ULg et al

Conference (2012, May 25)

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See detailObservations of halogens, CO, CH4, and H2CO at Ile de La Réunion from ground-based FTIR and MAXDOAS campaign measurements
De Mazière, Martine; Vigouroux, Corinne; Hendrick, François et al

Poster (2008, April)

Ile de La Réunion is a complementary site in the Network for the Detection of Atmospheric Composition Change (NDACC), situated in the southern tropics, at 21°S, 55°E. In support of a better understanding ... [more ▼]

Ile de La Réunion is a complementary site in the Network for the Detection of Atmospheric Composition Change (NDACC), situated in the southern tropics, at 21°S, 55°E. In support of a better understanding of atmospheric chemistry and physics above tropical regions, we have implemented new ground-based MAX-DOAS (multi-axis DOAS) and FTIR (Fourier transform infrared) observations at this site, on a campaign basis since 2002. At present, we have data from 2002 (month of October), 2004 (August to October) and 2007 (end of May until the end of October). Additional campaigns are planned until the availability of a new infrastructure for permanent observations at the Maido (~ 2000 masl), around 2010. Here, we report on the available time series for a number of tropospheric species (CO, H2CO and CH4,) and stratospheric halogen species, comparisons between MAX-DOAS and FTIR data of H2CO, and comparisons of ground-based and satellite data. [less ▲]

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