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Power of magnetopause low-frequency waves: A statistical study
Belmont, G.; Lucek, E.; Rezeau, L. +2 more
ULF fluctuations at the Earth magnetopause have been the subject of a long-standing interest because of their noticeable amplitude and their potential role in plasma penetration through the magnetosphere boundary. Some information on the nature of these fluctuations has already been provided thanks to GEOS and ISEE, and more recently Cluster, case…
A mid-infrared study of H II regions in the Magellanic Clouds: N88 A and N160 A
Tielens, A. G. G. M.; Peeters, E.; Martín-Hernández, N. L.
Aims: To show the importance of high-spatial resolution observations of H II regions when compared with observations obtained with larger apertures such as ISO, we present mid-infrared spectra of two Magellanic Cloud H II regions, N88 A and N160 A.
Methods: We obtained mid-infrared (8-13 µm), long-slit spectra with TIMMI2 on the ESO 3.6 …
BVR photometry of Hyperion near the time of the 2005 Cassini encounter
Buratti, Bonnie J.; Hicks, Michael D.; Basilier, Erik N.
Six nights of BVR photometry and three nights of R photometry were collected over a month-long period shortly after the Cassini encounter with Hyperion on September 24 2005. Our observations were designed to help constrain the rotational state of the chaotically rotating satellite. Fourier analysis of our lightcurve data yields three possible peri…
A three-dimensional automated classification scheme for the TAUVEX data pipeline
Singh, Harinder P.; Murthy, Jayant; Gupta, Ranjan +3 more
In order to develop a pipeline for automated classification of stars to be observed by the Tel-Aviv University Ultra-Violet Experiment (TAUVEX) ultraviolet space telescope, we employ an artificial neural network (ANN) technique for classifying stars by using synthetic spectra in the ultraviolet (UV) region from 1250 to 3220 Å as the training set a…
Determination of the True Shape of Coronal Loops
Gontikakis, C.; Alissandrakis, C. E.; Dara, H. C.
Using line of sight velocity measurements from the SUMER and CDS instruments aboard SOHO, in conjunction with a simple geometrical model, we reconstructed the true, 3D shape and the velocity of plasma flow along coronal loops. The projection of the loop on the sky and the position of the footpoints define a family of curves. Assuming that the loop…
The X-ray source population of the Andromeda galaxy M 31
Pietsch, W.
First studies of the X-ray source population of M 31 were performed with the Einstein Observatory and ROSAT. High resolution Chandra Observatory images not only spatially resolved the center area but also supernova remnants (SNRs) in the galaxy. Source catalogues of restricted areas were presented with high astrometric accuracy. Also luminosity fu…
Reconstruction of time-varying reconnection rate and X-line location
Semenov, V. S.; Ivanov, I. B.; Kiehas, S. A. +2 more
Remote-sensing method developed on the basis of time-dependent Petschek-type reconnection model is applied to Cluster magnetotail measurements from 8 September 2002, where a series of earthward propagating NFTEs (nightside flux transfer events) was observed. The method utilizes single-spacecraft magnetic data as an input and provides the reconnect…
Current Density and Wave Polarization Observed in Density Holes Upstream of Earth's Bow Shock
Dandouras, I.; Réme, H.; Lin, N. +5 more
Previous articles [1,2] have shown density holes are regions of density depletions below the solar wind level with scale length of an ion gyroradius. Density holes have steepened edges seen in both particles and fields. Here we present first observations of currents and wave polarizations associated with density holes. We show an example of curren…
Corrections to the Hipparcos Proper Motions in Declination for 807 Stars
Damljanovic, G.; Pejovic, N.
We used the data on latitude variations obtained from observations with 10 classical photographic zenith tubes (PZT) in order to improve the Hipparcos proper motions in declinations µ_{δ} for 807 stars. Part of observing programmes, carried out during the last century for the purpose of studying the Earth's rotation, were realized by using P…
Identification of the Exciting Source of CO Outflow in the Star-Formation Region GGD 12-15
Tamura, Motohide; Hashimoto, Jun; Kudo, Tomoyuki +10 more
We present results of near-infrared imaging polarimetry of the GGD 12-15 region with the IRSF 1.4m telescope and the SIRIUS camera/SIRPOL polarimeter and mid-infrared imaging with the AKARI telescope and the Infra-Red Camera (IRC). Two infrared sources, IRS9E and IRS9M near an H2O maser source situated on both sides around a VLA source …