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Photospheric and coronal magnetic fields in six magnetographs. II. Harmonic scaling of field intensities
Mursula, Kalevi; Virtanen, Ilpo
Context. Photospheric magnetic fields have been observed since the 1970s by several ground-based and satellite instruments. While the different instruments show a fairly similar large-scale structure and temporal evolution of the photospheric magnetic field, the magnetic field intensity varies significantly between the observations.
Aims: We …
Thermal structure of the upper atmosphere of Venus simulated by a ground-to-thermosphere GCM
López-Valverde, M. A.; Gilli, G.; González-Galindo, F. +5 more
We present here the thermal structure of the upper atmosphere of Venus predicted by a full self-consistent Venus General Circulation Model (VGCM) developed at Laboratoire de Météorologie Dynamique (LMD) and extended up to the thermosphere of the planet. Physical and photochemical processes relevant at those altitudes, plus a non-orographic GW para…
Ten billion years of brightest cluster galaxy alignments
West, Michael J.; Phillipps, Steven; Bremer, Malcolm N. +1 more
A galaxy's orientation is one of its most basic observable properties. Astronomers once assumed that galaxies are randomly oriented in space; however, it is now clear that some have preferred orientations with respect to their surroundings. Chief among these are giant elliptical galaxies found in the centres of rich galaxy clusters. Numerous studi…
Searching for candidates of Lyman continuum sources - revisiting the SSA22 field
Inoue, Akio K.; Yamada, Toru; Iwata, Ikuru +3 more
We present the largest to date sample of hydrogen Lyman continuum (LyC) emitting galaxy candidates at any redshift, with 18 Lyman α emitters (LAEs) and seven Lyman break galaxies (LBGs), obtained from the SSA22 field with Subaru/Suprime-Cam. The sample is based on the 159 LAEs and 136 LBGs observed in the field, all with spectroscopically confirme…
Understanding EROS2 observations toward the spiral arms within a classical Galactic model framework
Moniez, M.; Rahvar, S.; Ansari, R. +2 more
Aims: EROS (Expérience de Recherche d'Objets Sombres) has searched for microlensing toward four directions in the Galactic plane away from the Galactic center. The interpretation of the catalog optical depth is complicated by the spread of the source distance distribution. We compare the EROS microlensing observations with Galactic models (in…
Herschel/HIFI spectral line survey of the Orion Bar. Temperature and density differentiation near the PDR surface
Nagy, Z.; Bergin, E. A.; Gerin, M. +7 more
Context. Photon dominated regions (PDRs) are interfaces between the mainly ionized and mainly molecular material around young massive stars. Analysis of the physical and chemical structure of such regions traces the impact of far-ultraviolet radiation of young massive stars on their environment.
Aims: We present results on the physical and ch…
Theory and Transport of Nearly Incompressible Magnetohydrodynamics Turbulence. III. Evolution of Power Anistropy in Magnetic Field Fluctuations throughout the Heliosphere
Bruno, R.; Zank, G. P.; Shiota, D. +3 more
A theoretical model that describes the evolution of the power anisotropy in the energy-containing and inertial ranges throughout the heliosphere is developed for three possibilities: (i) no in situ sources of turbulence; (ii) stream-shear sources of 2D and slab turbulence; and (iii) a fully driven turbulence model that includes both stream-shear d…
The Origin of Solar Filament Plasma Inferred from In Situ Observations of Elemental Abundances
Chen, Y.; Li, B.; Song, H. Q. +6 more
Solar filaments/prominences are one of the most common features in the corona, which may lead to energetic coronal mass ejections (CMEs) and flares when they erupt. Filaments are about 100 times cooler and denser than the coronal material, and physical understanding of their material origin remains controversial. Two types of scenarios have been p…
The thermal structure of the Venus atmosphere: Intercomparison of Venus Express and ground based observations of vertical temperature and density profiles✰
Montmessin, Franck; Tanga, Paolo; Tellmann, Silvia +30 more
The Venus International Reference Atmosphere (VIRA) model contains tabulated values of temperature and number densities obtained by the experiments on the Venera entry probes, Pioneer Venus Orbiter and multi-probe missions in the 1980s. The instruments on the recent Venus Express orbiter mission generated a significant amount of new observational …
Magnetar-like X-Ray Bursts Suppress Pulsar Radio Emission
Israel, G.; Kerr, M.; Rea, N. +9 more
Rotation-powered pulsars and magnetars are two different observational manifestations of neutron stars: rotation-powered pulsars are rapidly spinning objects that are mostly observed as pulsating radio sources, while magnetars, neutron stars with the highest known magnetic fields, often emit short-duration X-ray bursts. Here, we report simultaneou…