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High-frequency slowly drifting structures and X-ray sources observed by RHESSI
Krucker, S.; Karlický, M.; Fárník, F.
Three solar flares (April 4, 2002, May 17, 2002, and August 30, 2002) with the 0.4-2.0 GHz slowly drifting structures were selected and analyzed together with RHESSI X-ray observations. Two events (April 4, 2002 and May 17, 2002) were observed above and one event (August 30, 2002) close to the solar limb. While in April 4, 2002 and August 30, 2002…
Network boundary origins of fast solar wind seen in the low transition region?
Doyle, J. G.; Xia, L. D.; Popescu, M. D.
We present a study of a high spatial resolution raster acquired on-disk with the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) grating spectrograph on SoHO (the Solar and Heliospheric Observatory) in a polar Coronal Hole (CH) region. We analyse two EUV emission lines, representing the properties of solar plasma in the low transition …
Determination of the Rotation Curve for Stars of the Gould Belt Using Bottlinger's Formulas
Bobylev, V. V.
Based on the Hipparcos catalog and the radial velocities of stars published to date, we perform a kinematic analysis of OB stars. Parameters of the general Galactic rotation were determined from distant OB stars. We used the residual velocities of stars corrected for the general Galactic rotation to study the proper rotation of nearby OB stars. Ge…
Supernova Remnants in the Magellanic Clouds. IV. X-Ray Emission from the Largest Supernova Remnant in the Large Magellanic Cloud
Gruendl, R. A.; Smith, R. C.; Points, S. D. +4 more
We present the first X-ray detection of SNR 0450-70.9, the largest known supernova remnant (SNR) in the Large Magellanic Cloud. To study the physical conditions of this SNR, we have obtained XMM-Newton X-ray observations, optical images and high-dispersion spectra, and radio continuum maps. Optical images of SNR 0450-70.9 show a large, irregular e…
The Sun as an X-ray star: Active region evolution, rotational modulation, and implications for stellar X-ray variability
Orlando, S.; Peres, G.; Reale, F.
We study the contribution of an active region and its core to the luminosity and the spectrum of the Sun in the X-ray band and to the relevant solar emission measure vs. temperature distribution, EM(T). We also study the relevant changes in the course of four solar rotations, and the solar rotational modulation due to this active region, the only …
Variability of the EUV quiet Sun emission and reference spectrum using SUMER
Kretzschmar, M.; Lilensten, J.; Aboudarham, J.
This paper aims to build a quiet Sun EUV reference spectrum from the SOHO - SUMER database. We make use of 750 quiet Sun spectra spread over a large range of solar activity. They are carefully calibrated both in terms of frequency and intensity. The data do not show any noticeable variations versus the solar activity. This allows us to build a qui…
ISO deep far-infrared survey in the ``Lockman Hole''. III. Catalogs and source counts at 90 & 170 µm
Sanders, D. B.; Kawara, K.; Taniguchi, Y. +7 more
We present the catalogs and source counts for the C90 (reference wavelength of 90 µm) and C160 (170 µm) bands, which were extracted from our analysis of an ISO deep far-infrared survey conducted as part of the Japan/UH ISO cosmology project. The total survey area is ∼0.9 deg2 in two fields within the Lo…
Simultaneous observations of Jovian quasi-periodic radio emissions by the Galileo and Cassini spacecraft
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +4 more
The gravity-assist flyby by Cassini of Jupiter on 30 December 2000 and the extended Galileo orbital mission provided a unique opportunity to obtain simultaneous measurements with two spacecraft of many Jovian plasma wave and radio emissions. One of these emissions is Jovian type III radio emissions, also known as Jovian quasi-periodic (QP) emissio…
The Ultraviolet and Optical Spectra of Luminous B-Type Stars in the Small Magellanic Cloud
Lennon, D. J.; Evans, C. J.; Walborn, N. R. +2 more
We present ultraviolet spectra from the Space Telescope Imaging Spectrograph (STIS) of 12 early B-type stars in the Small Magellanic Cloud (SMC), composed of nine supergiants and three giants. A morphological comparison with Galactic analogs is made using archival data from the International Ultraviolet Explorer (IUE). In general, the intensity of…
Double-damped Lyα Absorption: A Possible Large Neutral Hydrogen Gas Filament near Redshift z=1
Turnshek, David A.; Rao, Sandhya M.; Vanden Berk, Daniel +3 more
We report the discovery of two damped Lyα systems (DLAs) near redshift z=1 along a single quasar sight line (Q1727+5302) with neutral hydrogen column densities of NHI=(1.45+/-0.15)×1021 and (2.60+/-0.20)×1021 atoms cm-2. Their sight line velocity difference of 13,000 km s-1 corresponds to a pr…