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Wavelength and decay length of density overshoot structure in supercritical, collisionless bow shocks
Bale, S. D.; Horbury, T. S.; Saxena, R.
Above some critical Mach number, quasiperpendicular collisionless shocks are known to exhibit ``overshoot'' and ``undershoot'' structure thought to be associated with the motion of ions trapped at the shock front. Using spacecraft potential data from the Cluster spacecraft, the overshoot/undershoot density structure at 56 crossings of the quasiper…
Cluster magnetotail observations of a tailward-travelling plasmoid at substorm expansion phase onset and field aligned currents in the plasma sheet boundary layer
Davies, J. A.; Wild, J. A.; Fazakerley, A. N. +15 more
We present data from both ground- and space-based instruments for a substorm event which occurred on 5 October 2002, with an expansion phase onset time of 02:50 UT determined from the ground magnetometer data. During this substorm, the Cluster spacecraft were located around 15 RE downtail, 8 RE from midnight in the pre-midnig…
Comets, Asteroids and Zodiacal Light as Seen by Iso
Ábrahám, Péter; Müller, Thomas G.; Crovisier, Jacques
ISO performed a large variety of observing programmes on comets, asteroids and zodiacal light covering about 1% of the archived observations with a surprisingly rewarding scientific return. Outstanding results were related to the exceptionally bright comet Hale Bopp and to ISO's capability to study in detail the water spectrum in a direct way. But…
Global structure and composition of the martian atmosphere with SPICAM on Mars express
Bertaux, Jean-Loup; Dimarellis, E.; Forget, F. +26 more
SPectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) Light, a light-weight (4.7 kg) UV-IR instrument to be flown on Mars Express orbiter, is dedicated to the study of the atmosphere and ionosphere of Mars. A UV spectrometer (118-320 nm, resolution 0.8 nm) is dedicated to nadir viewing, limb viewing and verti…
An ISO-LWS two-colour diagram of Herbig Ae/Be stars
Elia, Davide; Strafella, Francesco; Campeggio, Loretta +2 more
In this paper, we present and discuss an infrared two-colour diagram built with the 60, 100, and 170 µm photometry of the whole sample of Herbig Ae/Be stars observed by the spectrometers on board of ISO satellite. An overview of this diagram reveals a certain degree of homogeneity in the behaviour of these stars and their IR-emitting environ…
The Cool Interstellar Medium
Miville-Deschênes, Marc-Antoine; Verstraete, Laurent; Abergel, Alain +2 more
Infrared spectroscopy and photometry with ISO covering most of the emission range of the interstellar medium has led to important progress in the understanding of the physics and chemistry of the gas, the nature and evolution of the dust grains and also the coupling between the gas and the grains. We review here the ISO results on the cool and low…
Large-scale dynamics and polarities of magnetic structures
Meunier, N.
A large data set of MDI magnetograms is studied in order to analyse the dependence of the global dynamics of magnetic structures on their polarity. Two complementary techniques (feature tracking and correlation tracking) are used to determine the differential rotation and meridional circulation. A faster rotation of leading polarity structures is …
Accurate photometric light curves of the lensed components of Q2237+0305 derived with an optimal image subtraction technique: Evidence for microlensing in image A
Surdej, J.; Libbrecht, C.; Moreau, O. +1 more
Using an optimal image subtraction technique, we have derived the V and R light curves of the four lensed QSO components of Q2237+0305 from the monitoring CCD frames obtained by the GLITP collaboration with the 2.6 m NOT telescope in 1999/2000 (Alcalde et al. 2002). We give here a detailed account of the data reduction and analysis and of the erro…
High Excitation ISM and Gas
Peeters, Els; Rodríguez-Fernández, Nemesio J.; Martín-Hernández, Nieves Leticia +1 more
An overview is given of ISO results on regions of high excitation ISM and gas, i.e. H II regions, the Galactic Centre and Supernova Remnants. IR emission due to fine-structure lines, molecular hydrogen, silicates, polycyclic aromatic hydrocarbons and dust are summarised, their diagnostic capabilities illustrated and their implications highlighted.
Outbursts on normal stars. FH Leo misclassified as a novalike variable
Santos, N. C.; Schmidtobreick, L.; Israelian, G. +1 more
We present high resolution spectroscopy of the common proper motion system FH Leo (components HD 96273 and BD+07 2411B), which has been classified as a novalike variable due to an outburst observed by Hipparcos, and we present and review the available photometry. We show from our spectra that neither star can possibly be a cataclysmic variable, in…