Search Publications
First results on the Be stars observed with the CoRoT satellite
Neiner, C.; Janot-Pacheco, E.; Floquet, M. +13 more
In this paper we present an overview of the analysis of some of the Be stars observed with the CoRoT satellite up to this date. Be stars are very fast-rotating B-type stars which may pulsate as β Cephei or SPB stars. CoRoT has already observed 5 bright Be stars in the seismology fields and several tens of fainter ones in the exoplanet fields with …
Morphological and electrical investigations of lead zirconium titanate thin films obtained by sol-gel synthesis on indium tin oxide electrodes
Marino, S.; Bruno, E.; De Santo, M. P. +4 more
In recent years, interest in PbZr0.53Ti0.47O3 (PZT) films has been rapidly increasing due to their technological applications as ferroelectric materials. In the present work, PZT films are obtained by sol-gel synthesis and deposited by spin coating on a transparent conductor substrate, with a perspective application as rectifying layers in asymmet…
Iterative inversion of global magnetospheric ion distributions using energetic neutral atom (ENA) images recorded by the NUADU/TC2 instrument
Barabash, S.; Dandouras, I.; Cao, J. B. +9 more
A method has been developed for extracting magnetospheric ion distributions from Energetic Neutral Atom (ENA) measurements made by the NUADU instrument on the TC-2 spacecraft. Based on a constrained linear inversion, this iterative technique is suitable for use in the case of an ENA image measurement, featuring a sharply peaked spatial distributio…
The mid-high latitude whistler mode chorus waves observed around substorm onsets
Cao, JinBin; Yang, JunYing; Yan, ChunXiao +2 more
Using the data of LFEW/TC-2, we studied the dawn side chorus around substorm onsets during a strong geomagnetic storm in November 2004. During this storm, LFEW/TC-2 observed 14 dawnside chorus events. Nine of them were associated with substorms and occurred within 40 min around the substorm onsets. The frequencies of waves have a very good correla…
Do Photospheric Brightness Structures Outside Magnetic Flux Tubes Contribute to Solar Luminosity Variation?
Bernasconi, Pietro N.; Foukal, Peter
Variations in total solar irradiance (TSI) correlate well with changes in projected area of photospheric magnetic flux tubes associated with dark sunspots and bright faculae in active regions and network. This correlation does not, however, rule out possible TSI contributions from photospheric brightness inhomogeneities located outside flux tubes …
The relationship between j × B and ∇·Pe in the magnetotail plasma sheet: Cluster observations
Lucek, E.; Fazakerley, A. N.; Owen, C. J. +6 more
In this paper we report an extension to Henderson et al.'s (2006) case study, in which we investigate the generality of the anticorrelation between the ∇·?e and j × B terms in Ohm's law observed in the plasma sheet. Further current sheet crossings are investigated which occurred on 17 August 2003 and 24 September 2003. Data from this pe…
Periodic traveling compression regions during quiet geomagnetic conditions and their association with ground Pi2
Dandouras, I.; Lucek, E.; Hasegawa, H. +5 more
Recently, Keiling et al. (2006) showed that periodic (~90 s) traveling compression regions (TCRs) during a substorm had properties of Pi2 pulsations, prompting them to call this type of periodic TCRs "lobe Pi2". It was further shown that time-delayed ground Pi2 had the same period as the lobe Pi2 located at 16 RE, and it was concluded t…
Modeling of the Extreme-Ultraviolet and Soft X-Ray Emission in a Solar Coronal Bright Point
Warren, Harry P.; Brooks, David H.
Previous studies have been able to reproduce both the observed intensities and the morphology of high-temperature solar plasma using steady state heating models. These models, however, have been unable to reproduce the lower temperature emission observed in active regions. Here we present results from numerical simulations of a coronal bright poin…
Scale height of the thin galactic disk in solar neighborhood
Zhu, Z.; Kong, D. L.
Thanks to astrometric data of unprecedented accuracy from Hipparcos Catalogue
(ESA 1997), it becomes possible to investigate, by directly counting stars, the scale height of the thin Galactic disk in solar neighborhood defined by the perpendicular distribution of stellar populations. In order to trace out the evolution of scale height, which …Instrumental Response Function for Filtergraph Instruments
Wachter, R.
Dopplergrams and magnetograms arising from filtergraph instruments such as the Michelson Doppler Imager (MDI), the Helioseismic and Magnetic Imager (HMI), or the Hinode Narrow Band Filter Imager are generally associated with observation heights that are derived from the contribution function of the targeted absorption line, irrespective of the ins…