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Analysis of Quiet-Sun Internetwork Magnetic Fields Based on Linear Polarization Signals
Bellot Rubio, L. R.; Orozco Suárez, D.
We present results from the analysis of Fe I 630 nm measurements of the quiet Sun taken with the spectropolarimeter of the Hinode satellite. Two data sets with noise levels of 1.2 × 10-3 and 3 × 10-4 are employed. We determine the distribution of field strengths and inclinations by inverting the two observations with a Milne-…
Basal magnetic flux and the local solar dynamo
Stenflo, J. O.
The average unsigned magnetic flux density in magnetograms of the quiet Sun is generally dominated by instrumental noise. Due to the entirely different scaling behavior of the noise and the solar magnetic pattern it has been possible to determine the standard deviation of the Gaussian noise distribution and remove the noise contribution from the a…
Detection of negative ions in the deep ionosphere of Titan during the Cassini T70 flyby
Wahlund, J. -E.; Edberg, N. J. T.; Ågren, K.
We present radio and plasma wave science (RPWS) Langmuir probe (LP) observations that give evidence for a population of heavy, negative ions at altitudes below 900 km in Titan's ionosphere during the Cassini T70 flyby. The negative ion density in this region is comparable to, or higher than, the electron density of 760 cm-3. Both positi…
Improved distance determination to M 51 from supernovae 2011dh and 2005cs
Garnavich, P. M.; Wheeler, J. C.; Pál, A. +9 more
Aims: The appearance of two recent supernovae, SN 2011dh and 2005cs, both in M 51, provides an opportunity to derive an improved distance to their host galaxy by combining the observations of both SNe.
Methods: We apply the Expanding Photosphere Method to get the distance to M 51 by fitting the data of these two SNe simultaneously. In or…
Shape modeling technique KOALA validated by ESA Rosetta at (21) Lutetia
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
We present here a comparison of our results from ground-based observations of asteroid (21) Lutetia with imaging data acquired during the flyby of the asteroid by the ESA Rosetta mission. This flyby provided a unique opportunity to evaluate and calibrate our method of determination of size, 3-D shape, and spin of an asteroid from ground-based obse…
Observations of magnetic flux ropes during magnetic reconnection in the Earth's magnetotail
Eastwood, J. P.; Taylor, M. G. G. T.; Borg, A. L.
We present an investigation of magnetic flux ropes observed by the four Cluster spacecraft during periods of magnetic reconnection in the Earth's magnetotail. Using a list of 21 Cluster encounters with the reconnection process in the period 2001-2006 identified in Borg et al. (2012), we present the distribution and characteristics of the flux rope…
HD 172555: detection of 63 µm [OI] emission in a debris disc
Pinte, C.; Ménard, F.; Duchêne, G. +14 more
Context.
Investigating the Reliability of Coronal Emission Measure Distribution Diagnostics using Three-dimensional Radiative Magnetohydrodynamic Simulations
Testa, Paola; Martínez-Sykora, Juan; De Pontieu, Bart +2 more
Determining the temperature distribution of coronal plasmas can provide stringent constraints on coronal heating. Current observations with the Extreme ultraviolet Imaging Spectrograph (EIS) on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory provide diagnostics of the emission measure distribution (E…
The XMM-BCS galaxy cluster survey. I. The X-ray selected cluster catalog from the initial 6 deg2
Finoguenov, A.; Böhringer, H.; Pratt, G. W. +19 more
The XMM-Newton-Blanco Cosmology Survey project (XMM-BCS) is a coordinated X-ray, optical and mid-infrared cluster survey in a field also covered by Sunyaev-Zel'dovich effect (SZE) surveys by the South Pole Telescope and the Atacama Cosmology Telescope. The aim of the project is to study the cluster population in a 14 deg2 field (center:…
Hot and cold ion outflow: Spatial distribution of ion heating
Nilsson, H.; Slapak, R.; André, M. +2 more
Ions apparently emanating from the same source, the ionospheric polar cap, can either end up as energized to keV energies in the high-altitude cusp/mantle, or appear as cold ions in the magnetotail lobes. We use Cluster observations of ions and wave electric fields to study the spatial variation of ion heating in the cusp/mantle and polar cap. The…