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Processes of equatorial thermal structure at Jupiter: An analysis of the Galileo temperature profile with a three-dimensional model
Waite, J. H.; Gladstone, G. R.; Bougher, S. W. +1 more
The Jupiter Thermospheric General Circulation Model (JTGCM) calculates the global dynamical structure of Jupiter's thermosphere self-consistently with its global thermal structure and composition. The main heat source that drives the thermospheric flow is high-latitude Joule heating. A secondary source of heating is the auroral process of particle…
Electron-scale sheets of whistlers close to the magnetopause
Lavraud, B.; André, M.; Stenberg, G. +6 more
Whistler emissions close to the magnetopause on the magnetospheric side are investigated using the four Cluster spacecraft. The waves are found to be generated in thin (electron-scale) sheets moving with the plasma drift velocity. A feature in the electron data coincides with the waves; hot magnetospheric electrons disappear for a few satellite sp…
Eclipsing binary statistics Theory and observation
Söderhjelm, S.; Dischler, J.
The expected distributions of eclipse-depth versus period for eclipsing binaries of different luminosities are derived from large-scale population synthesis experiments. Using the rapid Hurley et al. BSE binary evolution code, we have evolved several hundred million binaries, starting from various simple input distributions of masses and orbit-siz…
HST observations of the pulsating white dwarf GD 358
Kepler, S. O.; Winget, D. E.; Koester, D. +2 more
We used time-resolved ultraviolet spectroscopy obtained with the FOS and STIS spectrographs of the Hubble Space Telescope (HST), together with archival IUE observations to measure the effective temperature (Teff), surface gravity (log g) and distance (d) of the pulsating DB white dwarf GD 358 with unprecedented accuracy, and to show tha…
Dynamics of solar mesogranulation
Hanslmeier, A.; Hirzberger, J.; Pötzi, W. +2 more
Using a 45.5-h time series of photospheric flow fields generated from a set of high-resolution continuum images (SOHO/MDI) we analyze the dynamics of solar mesogranule features. The series was prepared applying a local correlation tracking algorithm with a 4.8´´ FWHM window. By computing 1-h running means in time steps of 10 min we generate 267 av…
Indirect calculation of the magnetic reconnection rate from flare loops
Ireland, J.; Walsh, R. W.; Noglik, J. B.
High time resolution Transition Region And Coronal Explorer (TRACE) 171 and 195 Å observations of the evolution of flare loops on 1999 March 18 have been investigated. Given the location of the magnetic loops on the northeast solar limb and the cadence of the TRACE observations (~50 s), an estimation of the footpoint velocity due to ongoing reconn…
On the Anomalous Red Giant Branch of the Globular Cluster ω Centauri
Sterken, C.; Prada Moroni, P. G.; Degl'Innocenti, S. +17 more
We present three different optical and near-infrared (NIR) data sets for evolved stars in the Galactic globular cluster ω Centauri. The comparison between observations and homogeneous sets of stellar isochrones and zero-age horizontal branches provides two reasonable fits. Both of them suggest that the so-called anomalous branch has a metal-interm…
On the Fractal Structure of Solar Supergranulation
Singh, Jagdev; Paniveni, U.; Krishan, V. +1 more
We employ fractal analysis to study the complexity of supergranulation structure using the Solar and Heliospheric Observatory (SOHO) dopplergrams. Our data consists of 200 visually selected supergranular cells, for which we find a broad, slightly asymmetric dispersion in the size distribution, with the most probable size around 31.9 Mm. From the a…
Very Large Array and SOHO Observations of Type I Noise Storms, Large-Scale Loops and Magnetic Restructuring in the Corona
Willson, Robert F.
Very Large Array (VLA) observations at 91-cm wavelength are combined with data from the SOHO EIT, MDI and LASCO and used to study the evolving coronal magnetic environment in which Type I noise storms and large-scale coronal loops occur. On one day, we have shown the early evolution of a coronal mass ejection (CME) in projection in the disk by tra…
Spatial Distribution and North-South Asymmetry of Coronal Bright Points from Mid-1998 to Mid-1999
Temmer, M.; Vršnak, B.; Wöhl, H. +5 more
Full-disc full-resolution (FDFR) solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) were used to analyse the centre-to-limb function and latitudinal distribution of coronal bright points. The results obtained with the interactive and the automatic method, as well as for…