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Polarization of loop-top and footpoint sources in microwave bursts
Su, Y. N.; Huang, G. L.
The polarization is analyzed in four microwave bursts with one loop-top and two footpoint sources observed at 17 GHz with the Nobeyama Radioheliograph (NoRH). The loop-like structure of the four events is confirmed by simultaneous SOHO/MDI magnetograms and TRACE/EUV images or Yohkoh/SXT images. The heliocentric distance of the four events is great…
Erratum: ``Looking for Gravity-Mode Multiplets with the GOLF Experiment aboard SOHO'' (ApJ, 604, 455 [2004])
Kosovichev, A. G.; García, R. A.; Provost, J. +12 more
As a result of an error at the Press, the second panel of Figure 9 was repeated twice in the top row of the printed, black-and-white version of this figure, and the first panel was omitted. This error appears in the print edition and the PDF and postscript (PS) versions available with the electronic edition of the journal, although the panels of t…
A critical discussion on parametric and nonparametric regression methods applied to Hipparcos-FK5 residuals
Marco, F. J.; Martínez, M. J.; López, J. A.
In this paper we present an analysis of the differences between the Hipparcos and FK5 catalogues. We study parametric and nonparametric methods with two main objectives: first, to determine whether or not there is a pure rotation between the two catalogues, and to decide which model best represents the residuals; second, to give a practical formul…
Field-aligned current distribution in the transition current system
Belenkaya, Elena S.; Alexeev, Igor I.; Clauer, C. Robert
The interactions of coronal mass ejections with the Earth's magnetosphere are interesting because they often lead to extreme forcing of magnetospheric convection. Here we consider the initial interaction of a CME with the magnetosphere for the specific case in which there is a sharp increase in the dynamic pressure (interplanetary shock) that is a…
On a systematic spectral variation of energetic ions in the Jovian outer magnetosphere: HI-SCALE/Ulysses observations
Sarris, E. T.; Anagnostopoulos, G. C.; Marhavilas, P. K.
An important finding of Ulysses flyby of Jupiter is the discovery of a large-scale energetic particle layer adjacent to the magnetopause. Previous studies discussed the particle flux and the anisotropy characteristics of this layer. This study examines the spectral characteristics of the large-scale magnetopause boundary layer of energetic particl…
A population of extreme mid-to-near-infrared sources: Obscured AGN and dusty starbursts
Vaccari, M.; Väisänen, P.; Johansson, P. H.
We present a sample of mid-infrared detected sources from the European Large Area ISO Survey (ELAIS) regions characterised by strong mid-IR radiation with faint near-IR and optical counterparts. These extreme mid-to-near-IR objects (EMNOs) are defined here by a flux ratio of fν (15 µm) / fν (2.2 µm) > 25. This …
Development of a micro-balance system for dust and water vapour detection in the Mars atmosphere
Colangeli, L.; Palumbo, P.; Palomba, E. +2 more
Quartz crystal piezoelectric sensors are suitable for deposition analyses that need very high sensitivity. Due to the wide working ranges and high performances, micro-balances can measure the mass settling in average Mars conditions during a period of months before saturation is reached. This ensures a proper use for short and long term water and …
Simulation and analysis of the revised Huygens probe entry and descent trajectory and radio link modelling
Lebreton, J. -P.; Kazeminejad, B.; Pérez-Ayúcar, M. +7 more
The Cassini spacecraft will arrive at Saturn in 2004 carrying the Huygens probe. The beginning of the Cassini tour at Saturn has been redesigned to achieve a different relative orbiter/probe geometry in order to compensate for the probe relay receiver design flaw that was discovered during tests in February 2000. This paper presents a numerical si…
Searching for Variability in the Globular Cluster Messier 4
Ibata, Rodrigo A.; Rich, R. Michael; Gibson, Brad K. +11 more
Time-series data taken with the Hubble Space Telescope of a field six core radii (~5') from the center of the globular cluster Messier 4, and covering a period of about 10 weeks in early 2001, have been analyzed in search of variable objects. Various criteria were employed to select candidate variable stars. Period searches were performed on the s…
Secular Trends in the Mean Longitudes of Planets Derived from Optical Observations
Kolesnik, Yuri B.; Masreliez, C. Johan
About 240,000 worldwide optical observations of the Sun, Mercury, and Venus, accumulated during the entire era of classical astrometry from James Bradley up to the present, are used to analyze the secular longitude variations of the innermost planets. A reduction method relating historical planetary observations to the Hipparcos reference frame is…