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Heating Signatures in the Disk Counterparts of Solar Spicules in Interface Region Imaging Spectrograph Observations
De Pontieu, B.; Rouppe van der Voort, L.; Carlsson, M. +2 more
We use coordinated observations with the Interface Region Imaging Spectrograph (IRIS) and the Swedish 1 m Solar Telescope to identify the disk counterpart of type II spicules in upper-chromospheric and transition region (TR) diagnostics. These disk counterparts were earlier identified through short-lived asymmetries in chromospheric spectral lines…
Interplanetary Propagation Behavior of the Fast Coronal Mass Ejection on 23 July 2012
Temmer, M.; Nitta, N. V.
The fast coronal mass ejection (CME) on 23 July 2012 caused attention because of its extremely short transit time from the Sun to 1 AU, which was shorter than 21 h. In situ data from STEREO-A revealed the arrival of a fast forward shock with a speed of more than 2200 km s−1 followed by a magnetic structure moving with almost 1900 km s
The Influence of Spatial resolution on Nonlinear Force-free Modeling
Sun, X.; Schrijver, C. J.; Canou, A. +11 more
The nonlinear force-free field (NLFFF) model is often used to describe the solar coronal magnetic field, however a series of earlier studies revealed difficulties in the numerical solution of the model in application to photospheric boundary data. We investigate the sensitivity of the modeling to the spatial resolution of the boundary data, by app…
Supernova 1987A: a Template to Link Supernovae to Their Remnants
Miceli, M.; Bocchino, F.; Orlando, S. +1 more
The emission of supernova remnants (SNRs) reflects the properties of both the progenitor supernovae (SNe) and the surrounding environment. The complex morphology of the remnants, however, hampers the disentanglement of the two contributions. Here, we aim at identifying the imprint of SN 1987A on the X-ray emission of its remnant and at constrainin…
Evolution of the ion environment of comet 67P/Churyumov-Gerasimenko. Observations between 3.6 and 2.0 AU
Kallio, E.; Fedorov, A.; Koskinen, H. +28 more
Context. The Rosetta spacecraft is escorting comet 67P/Churyumov-Gerasimenko from a heliocentric distance of >3.6 AU, where the comet activity was low, until perihelion at 1.24 AU. Initially, the solar wind permeates the thin comet atmosphere formed from sublimation.
Aims: Using the Rosetta Plasma Consortium Ion Composition Analyzer (RPC-I…
Dense cloud cores revealed by CO in the low metallicity dwarf galaxy WLM
Brinks, Elias; Elmegreen, Bruce G.; Rubio, Monica +3 more
Understanding stellar birth requires observations of the clouds in which they form. These clouds are dense and self-gravitating, and in all existing observations they are molecular, with H2 the dominant species and carbon monoxide (CO) the best available tracer. When the abundances of carbon and oxygen are low compared with that of hydr…
Spatial distribution of low-energy plasma around comet 67P/CG from Rosetta measurements
Glassmeier, K. -H.; Szego, K.; Nilsson, H. +22 more
We use measurements from the Rosetta plasma consortium Langmuir probe and mutual impedance probe to study the spatial distribution of low-energy plasma in the near-nucleus coma of comet 67P/Churyumov-Gerasimenko. The spatial distribution is highly structured with the highest density in the summer hemisphere and above the region connecting the two …
IRIS Si IV Line Profiles: An Indication for the Plasmoid Instability during Small-scale Magnetic Reconnection on the Sun
Innes, D. E.; Huang, Y. -M.; Guo, L. -J. +1 more
Our understanding of the process of fast reconnection has undergone a dramatic change in the last 10 years driven, in part, by the availability of high-resolution numerical simulations that have consistently demonstrated the break-up of current sheets into magnetic islands, with reconnection rates that become independent of Lundquist number, chall…
Peering through the holes: the far-UV color of star-forming galaxies at z ~ 3-4 and the escaping fraction of ionizing radiation
Schaerer, D.; Giavalisco, M.; Castellano, M. +11 more
Aims: We aim to investigate the effect of the escaping ionizing radiation on the color selection of high-redshift galaxies and identify candidate Lyman-continuum (LyC) emitters.
Methods: We used the intergalactic medium (IGM) prescription of Inoue et al. (2014, MNRAS, 442, 1805) and galaxy synthesis models of Bruzual & Charlot (2003,…
A novel scenario for the possible X-ray line feature at ~3.5 keV. Charge exchange with bare sulfur ions
Raassen, A. J. J.; Gu, L.; Kaastra, J. +4 more
Motivated by recent claims of a compelling ~3.5 keV emission line from nearby galaxies and galaxy clusters, we investigate a novel plasma model incorporating a charge exchange component obtained from theoretical scattering calculations. Fitting this kind of component with a standard thermal model yields positive residuals around 3.5 keV, produced …