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Magnetic Energy Balance in the Quiet Sun on Supergranular Spatial and Temporal Scales
Consolini, Giuseppe; Berrilli, Francesco; Del Moro, Dario +1 more
Small-scale magnetic fields are ubiquitous in the quiet solar photosphere and may store and transfer huge amounts of energy to the upper atmospheric layers. For this reason, it is fundamental to constrain the energetics of the quiet Sun. By taking advantage of a 24 hr long magnetogram time series acquired by the Hinode mission without interruption…
Hot Atmospheres of Galaxies, Groups, and Clusters of Galaxies
Werner, Norbert; Mernier, François
Most of the ordinary matter in the local Universe has not been converted into stars but resides in a largely unexplored diffuse, hot, X-ray emitting plasma. It pervades the gravitational potentials of massive galaxies, groups and clusters of galaxies, as well as the filaments of the cosmic web. The physics of this hot medium, such as its dynamics,…
Porosity gradients as a means of driving lateral flows at cometary surfaces
Thomas, Nicolas; Christou, Chariton; Dadzie, S. Kokou +1 more
The Rosetta spacecraft has provided invaluable and unexpected information about cometary outgassing. The on-board instruments ROSINA, MIRO, and VIRTIS showed non-uniform outgassing of H2O over the surface of the nucleus. Rarefied gas flows display remarkable flow phenomena that may help explain diverse physical observations and models h…
Secondary-electron radiation accompanying hadronic GeV-TeV gamma-rays from supernova remnants
Wang, Wei; Li, Zhuo; Huang, Yan +1 more
The synchrotron radiation from secondary electrons and positrons (SEPs) generated by hadronic interactions in the shock of supernova remnant (SNR) could be a distinct evidence of cosmic ray (CR) production in SNR shocks. Here, we provide a method where the observed gamma-ray flux from SNRs, created by pion decays, is directly used to derive the SE…
Migration jumps of planets in transition discs
Rometsch, Thomas; Rodenkirch, Peter J.; Kley, Wilhelm +1 more
Context. Transition discs form a special class of protoplanetary discs that are characterised by a deficiency of disc material close to the star. In a subgroup, inner holes in these discs can stretch out to a few tens of au while there is still mass accretion onto the central star observed at the same time.
Aims: We analyse the proposition th…
A Comprehensive Study of Hα Emitters at z ∼ 0.62 in the DAWN Survey: The Need for Deep and Wide Regions
Finkelstein, Steven L.; Mobasher, Bahram; Zheng, Zhen-Ya +19 more
We present new estimates of the luminosity function (LF) and star formation rate density (SFRD) for an Hα-selected sample at z ∼ 0.62 from the Deep And Wide Narrow-band (DAWN) survey. Our results are based on a new Hα sample in the extended COSMOS region (compared to Coughlin et al.) with the inclusion of flanking fields, resulting in a total area…
Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS
Masetti, N.; Charles, P. A.; Bird, A. J. +8 more
We report on a recent bright outburst from the new X-ray binary transient MAXI J1631-479, observed in January 2019. In particular, we present the 30-200 keV analysis of spectral transitions observed with INTEGRAL/IBIS during its Galactic plane monitoring program. In the MAXI and BAT monitoring period, we observed two different spectral transitions…
Imagery and UV Spectroscopy of the LMC Supernova Remnant N103B Using HST
Blair, William P.; Raymond, John C.; Pirzkal, Norbert +6 more
We present Hubble Space Telescope (HST)/Wide Field Camera 3 multiband imagery of N103B, which is the remnant of a SN Ia in the Large Magellanic Cloud, as well as HST/Cosmic Origins Spectrograph (COS) ultraviolet spectroscopy of the brightest radiatively shocked region. The images show a wide range of morphology and relative emission-line intensiti…
Predicting frequency changes of global-scale solar Rossby modes due to solar cycle changes in internal rotation
Birch, A. C.; Gizon, L.; Fournier, D. +1 more
Context. Large-scale equatorial Rossby modes have been observed on the Sun over the last two solar cycles.
Aims: We investigate the impact of the time-varying zonal flows on the frequencies of Rossby modes.
Methods: A first-order perturbation theory approach is used to obtain an expression for the expected shift in the mode frequencies d…
Characteristics of Reconnection Sites and Fast Flow Channels in an MHD Simulation
McPherron, R. L.; El-Alaoui, M.; Walker, R. J. +1 more
We investigate an interval of moderate magnetic activity from 0-8 UT on 14 March 2008 by using a global magnetohydrodynamics (MHD) simulation with high spatial and temporal resolution. Observations show several distinct substorms during this interval. One of these with onset at 04:44 UT occurs at 04:42 UT in the simulation. The simulation shows re…