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The Global Solar Magnetic Field Through a Full Sunspot Cycle: Observations and Model Results
Liu, Yang; Schrijver, Carolus J.
Based on 11 years of SOHO/MDI observations from the cycle minimum in 1997 to the next minimum around 2008, we compare observed and modeled axial dipole moments to better understand the large-scale transport properties of magnetic flux in the solar photosphere. The absolute value of the axial dipole moment in 2008 is less than half that in the corr…
2 Years of INTEGRAL Monitoring of GRS 1915+105. II. X-Ray Spectro-Temporal Analysis
Belloni, T.; Rodriguez, J.; Cadolle Bel, M. +14 more
This is the second paper presenting the results of 2 yr of monitoring of GRS 1915+105 with INTEGRAL, RXTE, and the Ryle Telescope. We present the X-ray spectral and temporal analysis of four observations showing strong radio to X-ray correlations. During one observation GRS 1915+105 was in a steady state, while during the three others it showed cy…
Sensitivity of helioseismic gravity modes to the dynamics of the solar core
Eff-Darwich, A.; García, R. A.; Mathur, S. +1 more
Context: The dynamics of the solar core cannot be properly constrained through the analysis of acoustic oscillation modes. Gravity modes (g modes) are necessary to understand the structure and dynamics of the deepest layers of the Sun. Through recent progress on the observation of these modes - both individually and collectively - new information …
Identifying XMM-Newton observations affected by solar wind charge exchange. Part I
Carter, J. A.; Sembay, S.
Aims: We describe a method for identifying XMM-Newton observations that have been affected by solar wind charge exchange (SWCX) emission and present preliminary results of previously unidentified cases of such emission within the XMM-Newton Science Archive.
Methods: The method is based on detecting temporal variability in the diffuse X-ray bac…
A latitudinal survey of CO, OCS, H2O, and SO2 in the lower atmosphere of Venus: Spectroscopic studies using VIRTIS-H
Drossart, P.; Piccioni, G.; Bézard, B. +3 more
The high-resolution channel (R $\simeq$ 2000) of the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument (VIRTIS-H) aboard Venus Express has provided numerous spectra of the nightside infrared thermal emission in the 2.3-µm window. Mixing ratios of various minor species in the 30-40 km range could therefore be inferred usin…
Distribution of icy particles across Enceladus' surface as derived from Cassini-VIMS measurements
Sotin, C.; Brown, R. H.; Baines, K. H. +16 more
The surface of Enceladus consists almost completely of water ice. As the band depths of water ice absorptions are sensitive to the size of particles, absorptions can be used to map variations of icy particles across the surface. The Visual and Infrared Mapping Spectrometer (VIMS) observed Enceladus with a high spatial resolution during three Cassi…
IMF dependence of high-latitude thermospheric wind pattern derived from CHAMP cross-track measurements
Liu, H.; Haaland, S. E.; Förster, M. +2 more
Neutral thermospheric wind pattern at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both North and South polar regions are statistically analyzed in their dependence on the Interplanetary Magnetic Field (IMF) direction in the GSM y-z plane (clock angle). We compare this dependency with magnetospher…
Discovery of the progenitor of the type Ia supernova 2007on
Nelemans, Gijs; Voss, Rasmus
Type Ia supernovae are exploding stars that are used to measure the accelerated expansion of the Universe and are responsible for most of the iron ever produced. Although there is general agreement that the exploding star is a white dwarf in a binary system, the exact configuration and trigger of the explosion is unclear, which could hamper their …
Estimating Stellar Rotation from Starspot Detection during Planetary Transits
Silva-Valio, Adriana
A new method for determining the stellar rotation period is proposed here, based on the detection of starspots during transits of an extrasolar planet orbiting its host star. As the planet eclipses the star, it may pass in front of a starspot which will then make itself known through small flux variations in the transit light curve. If we are luck…
Observations of aurorae by SPICAM ultraviolet spectrograph on board Mars Express: Simultaneous ASPERA-3 and MARSIS measurements
Lundin, R.; Futaana, Y.; Winningham, J. D. +12 more
We present a new set of observations of Martian aurorae obtained by Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) on board Mars Express (MEX). Using nadir viewing, several auroral events have been identified on the Martian nightside, all near regions of crustal magnetic fields. For most of these event…