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The temperature structure in the core of Sérsic 159-03
Kaastra, J. S.; de Plaa, J.; Tamura, T. +6 more
We present results from a new 120 ks XMM-Newton observation of the cluster of galaxies Sérsic 159-03. In this paper, we focus on the high-resolution X-ray spectra obtained with the Reflection Grating Spectrometer (RGS). The spectra allow us to constrain the temperature structure in the core of the cluster and determine the emission measure distrib…
Magnetospheric physics: Turbulence on a small scale
Goldstein, Melvyn L.
The four-spacecraft Cluster mission has identified small-scale vortices in Earth's magnetosphere. The observation reveals processes that transfer energy and momentum from the solar wind to the magnetosphere.
Hubble Space Telescope Imaging of the WR 38/WR 38a Cluster
Gies, Douglas R.; Moffat, Anthony F. J.; Wallace, Debra J. +2 more
We are conducting a high angular resolution imaging survey of Galactic Wolf-Rayet stars using the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope (HST). We have found a small stellar cluster associated with the faint, close pair WR 38 and WR 38a. We present astrometric measurements and photometry in the wide-band F336W (U), F439W (…
Interplanetary shocks unconnected with earthbound coronal mass ejections
Tappin, S. J.; Howard, T. A.
An associated study by Howard and Tappin (2005) identified 7 Earthbound forward shocks (of which 3 were geoeffective) which were not connected with any detectable coronal mass ejection activity along the Sun-Earth line. This largely unexplored result lends evidence to the fact that some large interplanetary transients are not detected by coronagra…
Flux pile-up and plasma depletion at the high latitude dayside magnetopause during southward interplanetary magnetic field: a cluster event study
Balogh, A.; Lavraud, B.; Rème, H. +3 more
An event of strong flux pile-up and plasma depletion at the high latitude magnetopause tailward of the cusp has been analyzed based on observations by the suite of Cluster spacecraft. The multi-satellite analysis facilitates the separation of temporal and spatial features and provides a direct estimate for the strength of the plasma depletion laye…
Einstein-de Sitter model re-examined for newly discovered Type Ia supernovae
Vishwakarma, R. G.
The consistency of the Einstein-de Sitter model with the Type Ia supernovae (SNe Ia) recently observed by the Hubble Space Telescope is examined. The model shows a reasonable fit to the observations, if account is taken of the extinction of SN light by the intergalactic metallic dust ejected from the SN explosions. Although the fit to the new data…
Fip Enhancement by Alfvén Ionization
Fletcher, L.; Potts, H. E.; Diver, D. A.
Alfvén ionization is offered as a possible mechanism underlying the enhanced population of low first ionization potential (FIP) species in the solar corona. In this process, the photospheric flow impinging on the magnetic structure of a coronal flux tube collides with, and displaces, ions in the magnetised plasma within the flux tube. This leads t…
High resolution observations of continuum radiation
Gurnett, D. A.; Pickett, J. S.; Santolik, O. +1 more
The Polar spacecraft has identified near-source regions of continuum emission in the plasmapause and outer plasmasphere. As in the case of kilometric continuum (KC), near-source regions of continuum emission often display a high resolution fine structure of closely spaced bands of emission. The separation of the bands is much less than the local g…
Cluster observations of magnetospheric substorm behavior in the near- and mid-tail region
McPherron, R. L.; Dunlop, M. W.; Baker, D. N.
The Cluster constellation of spacecraft has returned substantial new data on particle and field variations in the near- and mid-magnetotail regions of Earth's magnetosphere. Using the Research with Adaptive Particle Imaging Detectors (RAPID) system onboard the four Cluster vehicles, we have identified substorm-related energetic ( E > 20 keV) el…
The Impact of Sunspots on the Interpretation of Coronal Observations of the O VI Doublet
Morgan, H.; Habbal, S. Rifai
Due to their high intensity of emission in the O VI λλ1031.9 and 1037.6 lines, even small sunspots on the solar disk can strongly influence the intensity of the radiative scattering component of O VI lines in the corona. Observations of O VI disk spectra show a λ1032/λ1038 line intensity ratio of >2.6 in a sunspot, compared to quiet-disk values…