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Nonlinear Fast Magnetosonic Waves in Solar Prominence Pillars
DeVore, C. Richard; Ofman, Leon; Kucera, Therese A.
We investigate the properties of nonlinear fast magnetosonic (NFM) waves in a solar prominence, motivated by recent high-resolution and high-cadence Hinode/Solar Optical Telescope (SOT) observations of small-scale oscillations in a prominence pillar. As an example, we analyze the details of the 2012 February 14 Hinode/SOT observations of quasi-per…
The electric fields and "lightning jets" of the Sun and solar wind
Driscoll, C. F.
A model of electric energization of the solar wind and corona is developed, including electro-magnetic particle effects precluded by traditional magneto-hydro (MHD) assumptions. Using standard 1D radial solar models for particle density and temperature, the core gravito-electric field is calculated; and the range of possible photospheric photo-ele…
Herbig-Haro Flows and Young Stars in the Dobashi 5006 Dark Cloud
Rastorguev, A. S.; Magakian, T. Yu.; Movsessian, T. A. +1 more
Two new Herbig-Haro flows were found in a study of the isolated Dobashi 5006 dark cloud (l = 216°.7, b = –13°.9): one certain (HH 1179) and one presumable, associated with the infrared sources 2MASS 06082284-0936139 and 2MASS 06081525-0933490, correspondingly. Judging from their spectral energy distributions, these sources may be Class 1 objects w…
Photospheric magnetic flux and coronal emission properties of small-scale bright and faint loops in the quiet Sun
Madjarska, Maria S.; Wiegelmann, Thomas; Galsgaard, Klaus
Context. The study explores the photospheric magnetic properties of bright and faint small-scale loop systems in the solar atmosphere of the quiet Sun, also known as X-ray or coronal bright points.
Aims: To understand how plasma confined in small-scale loops is heated to million degrees, the loop-associated photospheric and coronal magnetic f…
Deciphering the Structural History of Ulysses Fossae, Mars, Using Fault Pattern Analysis
Byrne, Paul K.; Shahrzad, Stephanie; Bramham, Emma K. +3 more
Ulysses Fossae is a faulted region surrounded by lava flows that sits between the major volcanoes of the Tharsis Rise volcanic province on Mars. This area is unique, as it is the only exposure of extensional faulting which can be related to the Olympus Mons volcano and one of the only a few faulted areas relating to the Tharsis Montes. In order to…
Simulating Secondary Electron and Ion Emission from the Cassini Spacecraft in Saturn's Ionosphere
Miyake, Y.; Usui, H.; Johansson, F. L. +3 more
The Cassini spacecraft's Grand Finale flybys through Saturn's ionosphere provided unprecedented insight into the composition and dynamics of the gas giant's upper atmosphere and a novel and complex spacecraft-plasma interaction. In this article, we further study Cassini's interaction with Saturn's ionosphere using three-dimensional particle-in-cel…
Mass Ratio of Single-line Spectroscopic Binaries with Visual Orbits Using Bayesian Inference and Suitable Priors
Vanzi, Leonardo; Anguita-Aguero, Jennifer; Mendez, Rene A. +4 more
We present orbital elements for 22 single-line binaries, nine of them studied for the first time, determined from a joint spectroscopic and astrometric solution. The astrometry is based on interferometric measurements obtained with the HRCam Speckle camera on the SOAR 4.1 m telescope at Cerro Pachon, Chile, supplemented with historical data. The s…
Orbital parameters for an ELM white dwarf with a white dwarf companion: LAMOST J033847.06+413424.2
Huang, Xin; Chen, Xuefei; Li, Zhenwei +13 more
Double white dwarf systems are of great astrophysical importance in the field of gravitational wave and Type Ia supernova. While the binary fraction of CO core white dwarf is about a few per cents, the extremely low mass white dwarfs are all thought to be within binary systems. In this work, we report the orbital solution of a double degenerate sy…
The source of unusual coronal upflows with photospheric abundance in a solar active region
Barczynski, K.; Peter, H.; Zhukov, A. N. +21 more
Context. Upflows in the corona are of importance, as they may contribute to the solar wind. There has been considerable interest in upflows from active regions (ARs). The coronal upflows that are seen at the edges of active regions have coronal elemental composition and can contribute to the slow solar wind. The sources of the upflows have been ch…
Polycyclic aromatic hydrocarbon emission model in photodissociation regions - II. Application to the polycyclic aromatic hydrocarbon and fullerene emission in NGC 7023
Cami, Jan; Tielens, A. G. G. M.; Peeters, Els +1 more
We present a charge distribution-based emission model that calculates the infrared spectrum of fullerenes (C60). Analysis of the modelled spectrum of C60 in various charge states shows that the relative intensity of the features in the 5-10 µm versus 15-20 µm can be used to probe the C60 charge state in…