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Constraints on the average magnetic field strength of relic radio sources 0917+75 and 1401-33 from XMM-Newton observations
Harrison, Fiona A.; Harris, D. E.; Mao, Peter H. +1 more
We observed two relic radio sources, 0917+75 and 1401-33, with the XMM-Newton X-ray observatory. We did not detect any X-ray emission, thermal or non-thermal, in excess of the local background level from either target. This imposes new upper limits on the X-ray flux due to inverse Compton scattering of photons from the cosmic microwave background …
Comparison of SOHO UVCS and MLSO MK4 coronameter densities
Cho, K. -S.; Moon, Y. -J.; Choe, G. S. +3 more
We have compared the density distributions of solar corona obtained by SOHO Ultraviolet Coronagraph Spectrometer (UVCS) and Mauna Loa Solar Observatory (MLSO) MK4 coronameter. This is the first attempt to compare the coronal densities estimated by the two instruments. In the spectral data of UVCS, we have selected two emission lines (O VI 1032 Åan…
Diagnostics of active and eruptive prominences through hydrogen and helium lines modelling
Vial, J. -C.; Labrosse, N.; Gouttebroze, P.
In this study we show how hydrogen and helium lines modelling can be used to make a diagnostic of active and eruptive prominences. One motivation for this work is to identify the physical conditions during prominence activation and eruption. Hydrogen and helium lines are key in probing different parts of the prominence structure and inferring the …
ADONIS high contrast infrared imaging of Sirius-B
Pantin, E.; Bonnet-Bidaud, J. M.
Context: Sirius is the brightest star in the sky and a strong source of diffuse light for modern telescopes so that the immediate surroundings of the star are still poorly known.
Aims: We study the close surroundings of the star (2 to 25´´) by means of adaptive optics and coronographic device in the near-infrared, using the ESO/ADONIS system. …
Spectral analysis of LMC X-2 with XMM/Newton: unveiling the emission process in the extragalactic Z-source
Robba, N. R.; Iaria, R.; di Salvo, T. +2 more
Aims:We present the results of the analysis of an archival observation of LMC X-2 performed with XMM/Newton. The spectra taken by high-precision instruments have never been analyzed before.
Methods: We find an X-ray position for the source that is inconsistent with the one obtained by ROSAT, but in agreement with the Einstein position and that…
Nonthermal Electron Measurements in Solar Flares with Hinode EIS
Landi, Enrico; Feldman, Uri; Ralchenko, Yuri
The spectral range of the Hinode EIS (EUV Imaging Spectrometer) instrument is 170-211 Å and 245-291 Å lines emitted by low-energy levels in highly ionized Mn, Fe, Co, and Ni, as well as the very energetic 1s2s3S1-1s2p3P2 transition in Fe XXV, appear in the EIS range. In this paper, we investigate the use…
Kinematics and Velocity Ellipsoid of M Giants
Branham, R. L., Jr.
To study the kinematics of M giant stars (luminosity class III) use is made of 1,532 stars with proper motions taken from the Hipparcos catalog, of which 480 have radial velocities. Stars farther off than 700 pc were excluded because they induce a noticeable tilt in the distribution of the stars. Various solutions were performed, and the one calcu…
Morphology of the magnetic field near Mars and the role of the magnetic crustal anomalies: Dayside region
Kallio, E.; Fedorov, A.; Janhunen, P. +2 more
We have studied the morphology of magnetic flux tubes near Mars and have found that the magnetic field lines near Mars forms a wing-like flux tube structure downstream of the bow shock. These magnetic flux tubes are concentrated close to the plane, which contains the center of Mars, the interplanetary magnetic field, and the Mars-Sun line. Regions…
Composition Measurements of a Comet from the Rosetta Orbiter Spacecraft
Alexander, C.; Gulkis, S.
The European Space Agency (ESA) Rosetta Spacecraft, launched on March 2, 2004 toward Comet 67P/Churyumov-Gerasimenko (C-G), carries a complementary set of instruments on both the orbiter and lander (Philae) portions of the spacecraft, to measure the composition of the Comet C-G. The primary composition measuring instruments on the Orbiter are Alic…
UV optical measurements of the Nozomi spacecraft interpreted with a two-component LIC-flow model
Bzowski, M.; Yoshikawa, I.; Takahashi, Y. +7 more
Aims: Following recent reports on spectroscopic observations by SWAN/SOHO suggesting that the flows of neutral interstellar helium and hydrogen in the inner heliosphere are slightly divergent, we tried to verify them on the basis of simultaneous photometric observations of heliospheric hydrogen and helium glows performed by a spacecraft located on…