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Energetic Particle Pressure at Interplanetary Shocks: STEREO-A Observations
Lario, D.; Roelof, E. C.; Decker, R. B. +1 more
We study periods of elevated energetic particle intensities observed by STEREO-A when the partial pressure exerted by energetic (≥83 keV) protons (PEP) is larger than the pressure exerted by the interplanetary magnetic field (PB). In the majority of cases, these periods are associated with the passage of interplanetary shocks…
Dust and Polycyclic Aromatic Hydrocarbon in the HD 34700 Debris Disk
Seok, Ji Yeon; Li, Aigen
The debris disk around the Vega-type star HD 34700 is detected in dust thermal emission from the near-infrared (IR) to millimeter (mm) and submm wavelength range. Also detected is a distinct set of emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 µ {{m}}, which are commonly attributed to polycyclic aromatic hydrocarbon (PAH) molecules…
Extinction and Nebular Line Properties of a Herschel-selected Lensed Dusty Starburst at z = 1.027
Ivison, R. J.; Baes, Maarten; Fu, Hai +17 more
We present Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging and grism spectroscopy observations of the Herschel-selected gravitationally lensed starburst galaxy HATLASJ1429-0028. The lensing system consists of an edge-on foreground disk galaxy at z = 0.218 with a nearly complete Einstein ring of the infrared luminous galaxy at z = 1.027. …
Hydrographs of a Martian flood from the breach of Galilaei Crater
Coleman, Neil M.
Spectacular floods were spawned on Mars when large craters filled to overtopping and catastrophically breached. The wealth of data now available permits quantitative analysis of these ancient floods. Galilaei Crater is examined here, along with the likely sources of its water and the processes that formed Tana Vallis, its 1-km-deep outflow channel…
Cusp dynamics under northward IMF using three-dimensional global particle-in-cell simulations
Lembège, B.; Cai, D.; Esmaeili, A. +1 more
The interaction of the solar wind with the terrestrial magnetosphere is analyzed with the help of three-dimensional (3-D) global, full-electromagnetic particle-in-cell (PIC) simulations, in the configuration where the interplanetary magnetic field (IMF) is steadily northward. The present study is mainly focused on the cusp region and associated pa…
Topside of the martian ionosphere near the terminator: Variations with season and solar zenith angle and implications for the origin of the transient layers
Huang, Qian; Zhang, Jie; Orosei, Roberto +1 more
In this paper, the morphological variations of the M2 layer of the martian ionosphere with the martian seasons and solar zenith angle (SZA) at the terminator are investigated. The data used are the MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) measurements (approximately 5000 ionograms) that were acquired from 2005 to 2012, w…
From radio to TeV: the surprising spectral energy distribution of AP Librae
Fortin, P.; Horan, D.; Giebels, B. +10 more
Following the discovery of high-energy (HE; E > 10 MeV) and very-high-energy (VHE; E > 100 GeV) γ-ray emission from the low-frequency-peaked BL Lac (LBL) object AP Librae, its electromagnetic spectrum is studied over 60 octaves in energy. Contemporaneous data in radio, optical and UV together with the (non-simultaneous) γ-ray data are used t…
Statistics of the Velocity Gradient Tensor in Space Plasma Turbulent Flows
Consolini, Giuseppe; Materassi, Massimo; Federica Marcucci, Maria +1 more
In the last decade, significant advances have been presented for the theoretical characterization and experimental techniques used to measure and model all of the components of the velocity gradient tensor in the framework of fluid turbulence. Here, we attempt the evaluation of the small-scale velocity gradient tensor for a case study of space pla…
A XMM-Newton observation of a sample of four close dwarf spheroidal galaxies
Testa, V.; Nucita, A. A.; De Paolis, F. +2 more
We present the results of the analysis of deep archival XMM-Newton observations towards the dwarf spheroidal galaxies Draco, Leo I, Ursa Major II (UMa II) and Ursa Minor (UMi) in the Milky Way neighbourhood. The X-ray source population is characterized and cross-correlated with available databases to infer their nature. We also investigate if inte…
Intersunspot Microwave Sources
Bakunina, I. A.; Melnikov, V. F.; Solov'ev, A. A. +1 more
We studied a number of solar active regions using two-dimensional spatially resolved microwave observations. Data from the Nobeyama Radioheliograph and the Siberian Solar Radio Telescope together with observations by the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO) have allowed us to identify long-lived inte…