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Prominence corona transition region plasma diagnostics from SOHO observations
Vial, J. -C.; Rovira, M.; Cirigliano, D.
New results concerning prominence observations and in particular the prominence-corona transition region (PCTR) are presented. In order to cover a temperature range from 2 × 104 to 7 × 105 K, several emission lines in many different ionization states were observed with SUMER and CDS on board SOHO. EM and DEM were measured thr…
Multi-instrument observations of the ionospheric counterpart of a bursty bulk flow in the near-Earth plasma sheet
Klecker, B.; Nakamura, R.; Rème, H. +4 more
Available from http://www.copernicus.org/site/EGU/annales/22/4/1061.htm?FrameEngine=false;
Does Solar Structure Vary with Solar Magnetic Activity?
Basu, Sarbani; Mandel, Anna
We present evidence that solar structure changes with changes in solar activity. We find that the adiabatic index, Γ1, changes near the second helium ionization, i.e., at a depth of about 0.98 Rsolar. We believe that this change is a result of the change in the effective equation of state caused by magnetic fields. Inversions…
The complex soft X-ray spectrum of NGC 4151
Schurch, N. J.; Warwick, R. S.; Kahn, S. M. +1 more
We present a detailed analysis of the complex soft X-ray spectrum of NGC 4151 measured by the RGS instruments on board XMM-Newton. The XMM-Newton RGS spectra demonstrate that the soft X-ray emission is extremely rich in X-ray emission lines and radiative recombination continua (RRC), with no clear evidence for any underlying continuum emission. Li…
Saturn's cloud morphology and zonal winds before the Cassini encounter
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +2 more
Analyses of Hubble Space Telescope (HST) images of Saturn obtained from August 2003 to March 2004, with extensive support from ground-based telescopes, have been used to characterize the cloud morphology and motions in its atmosphere few months before the Cassini encounter. We present data on the major meteorological features as potential targets …
Cluster observations of surface waves on the dawn flank magnetopause
Dunlop, M.; Bosqued, J.; Fazakerley, A. +3 more
Available from http://www.copernicus.org/site/EGU/annales/22/3/971.htm?FrameEngine=false;
Beyond the iron group: Heavy metals in hot subdwarfs
O'Toole, S. J.
We report the discovery of strong photospheric resonance lines of Ga III, Ge IV, Sn IV and Pb IV in the UV spectra of more than two dozen sdB and sdOB stars at temperatures ranging from 22 000 K to 40 000 K. Lines of other heavy elements are also detected, however in these cases more atomic data are needed. Based on these discoveries, we present a…
Coronal Loop Oscillations and Flare Shock Waves
Hudson, H. S.; Warmuth, A.
A statistical analysis of coronal loop oscillations observed by the Transition Region and Coronal Explorer (TRACE) shows that 12 of 28 cases were associated with metric type II bursts. The timing is consistent with the idea that in many cases the loop oscillations result from the passage of a large-scale wave disturbance originating in a flare in …
Chromospheric Waves Observed in the He I Spectral Line (λ = 10830 Å): A Closer Look
Gilbert, Holly R.; Holzer, Thomas E.
Although ``Moreton'' waves have historically been observed in Hα data, more recently waves have also been observed in chromospheric He I (λ=10830 Å) images. In a previous study, we found that chromospheric waves observed in He I data (from the Mauna Loa Solar Observatory) in two events (occurring on 2000 November 25 and 2001 January 20) are cospat…
The X-ray luminosity function of galaxies in the Coma cluster
Finoguenov, A.; Boselli, A.; Gavazzi, G. +3 more
The XMM-Newton survey of the Coma cluster of galaxies covers an area of 1.86 square degrees with a mosaic of 16 pointings and has a total useful integration time of 400 ks. Detected X-ray sources with extent less than 10'' were correlated with cataloged galaxies in the Coma cluster region. The redshift information, which is abundant in …