Search Publications
A Survey of Molecular Hydrogen in the Crab Nebula
O'Dell, C. R.; Fabian, A. C.; Ferland, G. J. +4 more
We have carried out a near-infrared, narrowband imaging survey of the Crab Nebula, in the H2 2.12 µm and Brγ 2.17 µm lines, using the Spartan Infrared camera on the SOAR Telescope. Over a 2farcm8 × 5farcm1 area that encompasses about 2/3 of the full visible extent of the Crab, we detect 55 knots that emit strongly in the H
2D radiative-magnetohydrostatic model of a prominence observed by Hinode, SoHO/SUMER and Meudon/MSDP
Heinzel, P.; Schmieder, B.; Schwartz, P. +2 more
Aims: Prominences observed by Hinode show very dynamical and intriguing structures. To understand the mechanisms that are responsible for these moving structures, it is important to know the physical conditions that prevail in fine-structure threads. In the present work we analyse a quiescent prominence with fine structures, which exhibits dy…
On the origin of the energetic ion events measured upstream of the Earth's bow shock by STEREO, Cluster, and Geotail
Yamauchi, M.; Daly, P. W.; Klecker, B. +7 more
In 2007 during the declining phase of the solar cycle the energetic upstream ion events occurred mainly after a corotating interaction region passed the Earth's magnetosphere. We study the relation between these upstream events observed from about 70 to 1750 RE away from the Earth and observations in the vicinity of the terrestrial bow …
The Kelvin-Helmholtz instability at Venus: What is the unstable boundary?
Lammer, Helmut; Gröller, Hannes; Möstl, Ute V. +4 more
The Kelvin-Helmholtz instability gained scientific attention after observations at Venus by the spacecraft Pioneer Venus Orbiter gave rise to speculations that the instability contributes to the loss of planetary ions through the formation of plasma clouds. Since then, a handful of studies were devoted to the Kelvin-Helmholtz instability at the io…
The search for Titan lightning radio emissions
Gurnett, D. A.; Fischer, G.
We report on the non-detection of radio emissions indicative of Titan lightning by the Cassini RPWS (Radio and Plasma Wave Science) instrument. A previous study by Fischer et al. (2007) investigated the first 35 Titan flybys, and here we continue our search until the end of Cassini's equinox mission. No bursts that would clearly indicate the exist…
Differential Rotation of the Ultraviolet Corona at Solar Maximum
Giordano, Silvio; Mancuso, Salvatore
Synoptic observations of the O VI 1032 Å spectral line from the UltraViolet Coronagraph Spectrometer (UVCS) telescope on board the Solar and Heliospheric Observatory (SOHO) have been analyzed in order to establish the rotational characteristics of the solar corona in the time interval from 1999 March 18 to 2002 December 31, corresponding to the ma…
Mid-infrared interferometric monitoring of evolved stars. The dust shell around the Mira variable RR Aquilae at 13 epochs
Wittkowski, M.; Ohnaka, K.; Karovicova, I. +3 more
Aims: We present a unique multi-epoch infrared interferometric study of the oxygen-rich Mira variable RR Aql in comparison to radiative transfer models of the dust shell. We investigate flux and visibility spectra at 8-13 µm with the aim of better understanding the pulsation mechanism and its connection to the dust condensation sequence…
An overview of RADOM results for earth and moon radiation environment on Chandrayaan-1 satellite
Girish, V.; Vadawale, S. V.; Goswami, J. N. +5 more
The RADiatiOn Monitor (RADOM) is a miniature dosimeter-spectrometer that flew onboard the Chandrayaan-1 lunar mission in order to monitor the local radiation environment. Primary objective of the RADOM experiment was to measure the total absorbed dose, flux of surrounding energetic particles and spectrum of the deposited energy from high energy pa…
V2492 Cygni: The Early Evolution of the 2010 Outburst
Aspin, Colin
We present Gemini-North optical and near-IR observations of a young eruptive star in Cygnus, designated as V2492 Cygni in the General Catalog of Variable Stars. This object is one of two young stars, located within 2 deg of each other, that recently brightened by around 5 mag and were reported as possible new FU Orionis-type variables. The outburs…
Solar Wind and Coronal Bright Points inside Coronal Holes
Karachik, Nina V.; Pevtsov, Alexei A.
Observations of 108 coronal holes (CHs) from 1998-2008 were used to investigate the correlation between fast solar wind (SW) and several parameters of CHs. Our main goal was to establish the association between coronal bright points (CBPs; as sites of magnetic reconnection) and fast SW. Using in situ measurements of the SW, we have connected strea…