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Interferometric identification of ion acoustic broadband waves in the auroral region: CLUSTER observations
André, M.; Vaivads, A.; Fazakerley, A. +2 more
We determine the phase velocity and k vector for parallel and oblique broadband extremely low frequency, ELF, waves on nightside auroral magnetic field lines at altitudes around 4.6 RE. We use internal burst mode data from the EFW electric field and wave instrument onboard the Cluster spacecraft to retrieve phase differences between the…
First observations of the planetary Fourier spectrometer at Mars
Piccioni, G.; Grassi, D.; Khatuntsev, I. +8 more
The first results of the Planetary Fourier Spectrometer (PFS) orbiting the planet Mars are reviewed and discussed here, with reference to a set of studies being published elsewhere. An average global spectrum ranging from 200 to 8200 cm -1 is discussed by comparing it to the ISO SWS Martian spectrum and to the global synthetic spectrum …
A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock
Glassmeier, K. -H.; Fazakerley, A. N.; Gurgiolo, C. +2 more
Observations of nongyrotropic electron distributions in the region upstream of the Earth's bow shock suggest that there exists a mechanism to lock in their phase, otherwise they would rapidly gyrophase mix into a ring-beam distribution. Measurements by the Plasma Electron and Current Experiment (PEACE) on the Cluster spacecraft have provided a way…
Study of the structure of abell 3571: An XMM-Newton view
Hudaverdi, M.; Furuzawa, A.; Yamashita, K.
The non-uniform temperature and abundance distribution in the central region of A3571 is investigated. Our previous analysis of ASCA data suggested that the cluster experiences a relatively large scale group infall. By the advantage of XMM-Newton's high angular resolution, we are able to investigate dynamical structures down to the 100 kpc scale. …
Non-thermal processes associated with rising structures and waves during a "halo" type CME
Karlický, M.; Aurass, H.; Pohjolainen, S. +2 more
We analyse structures and events connected with a flare-associated "halo" type coronal mass ejection (CME) observed on December 18, 2000. A GOES C7.0 class X-ray flare started at 11:02 UT in NOAA Active Region 9269, located at N14 E03. Yohkoh SXT observed slowly rising soft X-ray loops already some 5 min before flare start. Hα images show a two-ri…
Coronal oscillations in the vicinity of a sunspot as observed by GIS/CDS
Foley, C. R.; Doyle, J. G.; Banerjee, D. +2 more
In this paper, we present results from a time series analysis of data from the Grazing Incidence Spectrometer (GIS), onboard SoHO. Our observations were concentrated at the boundary between the quiet Sun and an active region, close to a sunspot plume. The dominant oscillations in all the lines studied are of periods longer than 5 min. Although our…
Titan's Ground Reflectance Retrieval from Cassini-Vims Data Taken during the July 2ND, 2004 Fly-By at 2 AM UT
D'Aversa, E.; Orosei, R.; Coradini, A. +5 more
An attempt to evaluate the preliminary values of the Titan's surface albedo at 2 µm from the first Cassini-VIMS observations of the moon is presented. The methodology is based on the application of radiative transfer calculations and a microphysical model of the Titan atmosphere based on fractal aerosol. As a first guess, the surface has bee…
Systematic analysis of X-ray GRB afterglows observed with XMM-Newton and Chandra
Piro, L.; Gendre, B.; Depasquale, M.
We present a sample of GRB afterglows observed in the X-ray band with XMM-Newton or Chandra, focusing on the brightest events. We have derived for this sample the temporal slope and the spectral index of the continuum, and used closure relationships to discriminate the afterglow environment for each burst. We show that jet features are excluded mo…
AGNS and MICROQUASARS As High-Energy γ-Ray Sources
Paredes, Josep M.
The extragalactic analogs of the microquasars, the quasars, are strong γ-ray emitters at GeV energies. It is expected that microquasars are also γ-ray sources, because of the analogy with quasars and because theoretical models predict the high-energy emission. There are two microquasars that appear as the possible counterparts for two unidentified…
Extended very cold dust in the interacting HI ring galaxy pair NGC 2293 / 2292
Krause, O.; Barnes, D.; Stickel, M.
The LGG 138 galaxy group members NGC 2292 and NGC 2293 were imaged with ISOPHOT in the far-infrared (FIR) at {60 µ m}, {100 µ m}, and {200 µ m}. While no FIR emission is seen at {60 µ m}, and only very low level emission is present at {100 µ m}, compact FIR emission from both NGC 2292 and NGC 2293 galaxy centres and e…