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On Molecular Hydrogen Formation and the Magnetohydrostatic Equilibrium of Sunspots
Lin, H.; Jaeggli, S. A.; Uitenbroek, H.
We have investigated the problem of sunspot magnetohydrostatic equilibrium with comprehensive IR sunspot magnetic field survey observations of the highly sensitive Fe I lines at 15650 Å and nearby OH lines. We have found that some sunspots show isothermal increases in umbral magnetic field strength which cannot be explained by the simplified sunsp…
XMM-Newton observation of the persistent Be/NS X-ray binary pulsar RX J0440.9+4431
Tiengo, A.; Mereghetti, S.; Sidoli, L. +2 more
Many X-ray accreting pulsars have a soft excess below 10 keV. This feature was also detected in faint sources and at low luminosity levels, suggesting that it is an ubiquitous phenomenon. For the high luminosity pulsars (LX > 1036 erg s-1), the fit to this component with thermal emission models usually provides …
Thermal and Chemical Structure Variations in Titan's Stratosphere during the Cassini Mission
Teanby, N. A.; Flasar, F. M.; Preka-Papadema, P. +12 more
We have developed a line-by-line Atmospheric Radiative Transfer for Titan code that includes the most recent laboratory spectroscopic data and haze descriptions relative to Titan's stratosphere. We use this code to model Cassini Composite Infrared Spectrometer data taken during the numerous Titan flybys from 2006 to 2012 at surface-intercepting ge…
An Interpretation of the Possible Mechanisms of Two Ground-level Enhancement Events
Gan, W. Q.; Moon, Y. -J.; Firoz, Kazi A. +1 more
We have carried out this work to clarify the possible mechanisms of two important high-energy particle events (GLE69 2005 January 20, 06:46 UT and GLE70 2006 December 13, 02:45 UT). For this purpose, the cosmic-ray intensities registered by neutron monitors at several sites have been analyzed and studied with concurrent solar flares of different e…
HESS observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +191 more
The massive binary system Eta Carinae and the surrounding H II complex, the Carina nebula, are potential particle acceleration sites from which very high energy (VHE; E≥ 100 GeV) γ-ray emission could be expected. This paper presents data collected during VHE γ-ray observations with the HESS telescope array from 2004 to 2010, which cover a full orb…
The Creation of Outflowing Plasma in the Corona at Emerging Flux Regions: Comparing Observations and Simulations
van Driel-Gesztelyi, L.; Harra, L. K.; Hood, A. W. +3 more
In this paper we analyse the flux emergence that occurred in the following polarity area of an active region on 1 - 2 December 2006. Observations have revealed the existence of fast outflows at the edge of the emerging flux region. We have performed 3-D numerical simulations to study the mechanisms responsible for these flows. The results indicate…
One Thousand and One Clusters: Measuring the Bulk Flow with the Planck ESZ and X-Ray-selected Galaxy Cluster Catalogs
Hajian, Amir; Mody, Krishnan
We present our measurement of the "bulk flow" using the kinetic Sunyaev-Zel'dovich (kSZ) effect in the Wilkinson Microwave Anisotropy Probe (WMAP) seven-year data. As the tracer of peculiar velocities, we use Planck Early Sunyaev-Zel'dovich Detected Cluster Catalog and a compilation of X-ray-detected galaxy cluster catalogs based on ROSAT All-Sky …
Star Formation and Young Population of the H II Complex Sh2-294
Samal, M. R.; Ojha, D. K.; Pandey, A. K. +3 more
The Sh2-294 H II region ionized by a single B0V star features several infrared excess sources, a photodissociation region, and also a group of reddened stars at its border. The star formation scenario in this region seems to be quite complex. In this paper, we present follow-up results of Sh2-294 H II region at 3.6, 4.5, 5.8, and 8.0 µm obse…
A Companion as the Cause of Latitude-dependent Effects in the Wind of Eta Carinae
Madura, T. I.; Hillier, D. J.; Weigelt, G. +2 more
We analyze spatially resolved spectroscopic observations of the Eta Carinae binary system obtained with the Hubble Space Telescope/STIS. Eta Car is enshrouded by the dusty Homunculus nebula, which scatters light emitted by the central binary and provides a unique opportunity to study a massive binary system from different vantage points. We invest…
A case study of proton precipitation at Mars: Mars Express observations and hybrid simulations
Kallio, E.; Fedorov, A.; Barabash, S. +8 more
Using the data from the Analyzer of Space Plasma and Energetic Atoms (ASPERA-3) experiment on board Mars Express and hybrid simulations, we have investigated the entry of protons into the Martian induced magnetosphere. We discuss one orbit on the dayside with observations of significant proton fluxes at altitudes down to 260 km on 27 February 2004…