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CLUSTER spacecraft observation of a thin current sheet at the Earth’s magnetopause
Fränz, M.; Dandouras, I.; Khotyaintsev, Y. +7 more
On March 30, 2002 within 17 min the four CLUSTER spacecraft crossed the Earth’s high-latitude magnetopause three times. We found that all three magnetopause current sheets are nearly co-planar on the scales of the CLUSTER spacecraft separation. The thickness of the current sheets changes from 1 to 40 magnetosheath-proton thermal gyro-radii. The th…
Coronal Magnetic Field Topology over Filament Channels: Implication for Coronal Mass Ejection Initiations
Luhmann, Janet; Li, Yan
The magnetic field topology at the coronal mass ejection (CME) source regions has been one of the major focuses of CME initiation models. While the ``breakout'' model requires a quadrupolar magnetic topology in the solar corona to enable an eruption, other models have shown that a bipolar magnetic topology can be the source region of a CME. In thi…
Bifurcated current sheets: Statistics from Cluster magnetometer measurements
Balogh, A.; Kistler, L. M.; El-Alaoui, M. +3 more
We report on a statistical study of bifurcated current sheets in the near-Earth plasma sheet and the association of such current sheets with a near-Earth neutral line. Support for this interpretation is provided by a global MHD simulation generated for geomagnetic and solar wind conditions prevailing at the time when a bifurcated current sheet was…
Rosetta Lander—Philae: Implications of an alternative mission
Rosenbauer, H.; Hilchenbach, M.; Ulamec, S. +5 more
“Rosetta” is a Cornerstone Mission of the Horizon 2000 ESA Programme. Its goal is to rendezvous with a comet and to study its nucleus and coma using an orbiting spacecraft and a landed platform. The latter is called Philae; the Rosetta Lander has been designed to land softly on the comet nucleus and is equipped with 10 scientific instruments to pe…
On the profile of intense high-altitude auroral electric fields at magnetospheric boundaries
Nilsson, H.; Karlsson, T.; Marchaudon, A. +5 more
The profile of intense high-altitude electric fields on auroral field lines has been studied using Cluster data. A total of 41 events with mapped electric field magnitudes in the range between 0.5-1 V/m were examined, 27 of which were co-located with a plasma boundary, defined by gradients in particle flux, plasma density and plasma temperature. M…
XMM-Newton Detection of X-Ray Emission from the Compact Steep-Spectrum Radio Galaxy 3C 303.1
O'Dea, Christopher P.; Baum, Stefi; Worrall, D. M. +3 more
Using XMM-Newton we detect faint unresolved X-ray emission from the compact steep-spectrum radio galaxy 3C 303.1. We detect a thermal component at kT~=0.8 keV, which seems likely to be produced in the interstellar medium (ISM) of the host galaxy. There is evidence for a second component in the spectrum whose nature is currently ambiguous. Plausibl…
A Genuine Intermediate-Age Globular Cluster in M33
Chandar, Rupali; Sarajedini, Ata; Goudfrooij, Paul +1 more
We present deep integrated-light spectroscopy of nine M33 globular clusters taken with the Hectospec instrument at the MMT Observatory. Based on our spectroscopy and previous deep color-magnitude diagrams obtained with HST WFPC2, we present evidence for the presence of a genuine intermediate-age globular cluster in M33. The analysis of Lick line i…
ICMEs at High Latitudes and in the Outer Heliosphere. Report of Working Group H
Lario, D.; Balogh, A.; Rodriguez, L. +14 more
Interplanetary coronal mass ejections (ICMEs) propagate into the outer heliosphere, where they can have a significant effect on the structure, evolution, and morphology of the solar wind, particularly during times of high solar activity. They are known to play an important role in cosmic ray modulation and the acceleration of energetic particles. …
Semiempirically derived heating function of the corona heliosphere during the Whole Sun Month
Sittler, E. C.; Guhathakurta, M.; Ofman, L.
In spite of many recent developments in observations and models of the solar corona, the exact form of the heating function of the solar wind plasma is unknown. Here we attempt to make some progress on that problem by applying a previously developed simplified magnetohydrodynamic model to a unique synthesis of remote sensing coronal observations f…
Star-forming Galaxies at Intermediate Redshifts: Morphology, Ages, and Sizes
Casertano, S.; Dahlen, T.; de Mello, D. F. +2 more
We present an analysis of the deepest near-UV image obtained with the Hubble Space Telescope using the WFPC2 (F300W) as part of the parallel observations of the Hubble Ultra Deep Field campaign. The U-band 10 σ limiting magnitude measured over 0.2 arcsec2 is mAB=27.5, which is 0.5 mag deeper than that in the Hubble Deep Field…