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Series of high-frequency slowly drifting structures mapping the flare magnetic field reconnection
Karlický, M.
Rare series of the slowly drifting structures observed during two solar flares (April 11, 2001 and March 18, 2003) in the 0.8-4.5 GHz frequency range are studied. Their time-frequency evolution is compared with topological and X-ray characteristics of the flares. Based on recent modelling of the magnetic field reconnection in the bursting and inte…
Solar Subsurface Fluid Dynamics Descriptors Derived from Global Oscillation Network Group and Michelson Doppler Imager Data
Howe, R.; Komm, R.; Hill, F. +4 more
We analyze Global Oscillation Network Group (GONG) and Michelson Doppler Imager (MDI) observations obtained during Carrington rotation 1988 (2002 March 30-April 26) with a ring-diagram technique in order to measure the zonal and meridional flow components in the upper solar convection zone. We derive daily flow maps over a range of depths up to 16…
The XMM-Newton HBS28 sample: Studying the obscuration in hard X-ray selected AGNs
Page, M. J.; Wolter, A.; Barcons, X. +9 more
This paper presents the analysis of a statistically complete sample of 28 serendipitous X-ray sources selected in 82 pointed XMM-Newton fields down to a count-rate of 0.002 counts s-1 (4.5-7.5 keV energy band). This is the first sample selected in this energy range to have complete spectroscopic identifications and redshift determinatio…
Wide-Field X-Ray Temperature, Pressure, and Entropy Maps of A754
Finoguenov, Alexis; Henry, J. Patrick; Briel, Ulrich G.
We present a mosaic of XMM-Newton observations of the nearby major-merger cluster A754 that has either a wider field or better spectral or spatial resolution than previous observations. We construct maps of X-ray surface brightness and temperature integrated along the line of sight. From these two primary maps we derive pseudopressure and pseudoen…
X-ray observations of Be/X-ray binaries in the SMC
Pietsch, W.; Haberl, F.
Fifteen Be/X-ray binaries and candidates in the SMC were observed serendipitously with the EPIC instruments of XMM-Newton during two observations of SNR 0047-73.5 and SNR 0103-72.6 in October 2000. A total of twelve of those sources are detected. For eleven of them an accurate position and in part detection of X-ray pulsations support the proposed…
A distance of 133-137 parsecs to the Pleiades star cluster
Kulkarni, S. R.; Shao, M.; Pan, Xiaopei
Nearby `open' clusters of stars (those that are not gravitationally bound) have played a crucial role in the development of stellar astronomy because, as a consequence of the stars having a common age, they provide excellent natural laboratories to test theoretical stellar models. Clusters also play a fundamental part in determining distance scale…
A multiply imaged, submillimetre-selected ultraluminous infrared galaxy in a galaxy group at z~ 2.5
Smail, Ian; Kneib, Jean-Paul; van der Werf, Paul P. +5 more
We present observations of a remarkable submillimetre-selected galaxy, SMM J16359+6612. This distant galaxy lies behind the core of a massive cluster of galaxies, A 2218, and is gravitationally lensed by the foreground cluster into three discrete images which were identified in deep submillimetre maps of the cluster core at both 450 and 850 µ…
Tracking of TRACE Ultraviolet Flare Footpoints
Fletcher, Lyndsay; Pollock, Jennifer A.; Potts, Hugh E.
Solar flares produce bright, compact sources of UV emission in the lower atmosphere, identified as flare footpoints. Observed at high time cadence with the Transition Region and Coronal Explorer, groups of UV footpoints define flare `ribbons' which move as the flare progresses. We have developed a procedure to track individual bright kernels withi…
Characteristics of Saturn's FUV aurora observed with the Space Telescope Imaging Spectrograph
Trauger, John T.; Gustin, Jacques; Clarke, John T. +3 more
We analyze a set of 15 FUV images obtained between October 1997 and January 2001 with the Hubble Space Telescope Imaging Spectrograph (STIS), providing a good view of Saturn's south auroral oval. It is found that the morphology and brightness distribution of the aurora are dynamical with variations occurring on time scales of hours or less. The da…
Real-time shock arrival predictions during the ``Halloween 2003 epoch''
Dryer, M.; Smith, Z.; Fry, C. D. +3 more
The ``Halloween'' epoch from 19 October to 20 November 2003 was marked by 19 major solar flares that were accompanied by metric type II radio bursts. Several of these flares were followed by major geomagnetic storms. The radio bursts were used in real time because they imply coronal and interplanetary transport. Most of these events were also asso…