Search Publications
Magnetic holes between Earth and Mercury: BepiColombo cruise phase
Glassmeier, K. -H.; Karlsson, T.; Nakamura, R. +14 more
Context. Magnetic holes are ubiquitous structures in the solar wind and in planetary magnetosheaths. They consist of a strong depression of the magnetic field strength, most likely in pressure balance through increased plasma pressure, which is convected with the plasma flow. These structures are created through a plasma temperature anisotropy, wh…
Links between optical and X-ray light in Scorpius X-1
Britt, C. T.; Hynes, R. I.; Igl, Alexander B. +2 more
We observed the low-mass X-ray binary Sco X-1 for 12 nights simultaneously using the Rossi X-Ray Timing Explorer and the Otto Struve Telescope at McDonald Observatory at 1-s time-resolution. This is among the most comprehensive simultaneous X-Ray/optical data sets of Sco X-1. Evidence of reprocessing was observed in the form of nine positive, near…
Unveiling the Subsurface of Late Amazonian Lava Flows at Echus Chasma, on Mars
Mansilla, Federico; Zorzano, María-Paz; Giannakis, Iraklis +1 more
The Echus-Kasei region on Mars has been exposed to different episodic volcanic, fluvial, and glacial events in Amazonian time. The goal of the present work is to demonstrate the usefulness of radar instruments to find preserved late Amazonian subsurface structures that may have been encapsulated underneath recent lava flows on Mars. We have analys…
Asteroseismology of the DAV star KUV 08368+4026
Yang, Y. H.; Chen, Y. H.; Tang, M. Y.
As a DAV star, KUV 08368+4026 was observed by Li et al. in 2009 February, 2009 December, 2010 January, and 2012 February. They extracted 30 frequencies from the reported 300 h observation data and identified 17 independent modes. Based on the frequency splitting relationship, 6 l = 1 modes and 1 l = 2 mode are identified. The seven identified mode…
Multiwavelength and astrometric study of the DBS 89−90−91 embedded clusters region
Orellana, R. B.; Suad, L. A.; Corti, M. A. +1 more
Aims: Our main aims are to improve our understanding of the main properties of the radio source G316.8−0.1 (IRAS 14416−5937) where the DBS 89−90−91 embedded clusters are located, to identify the stellar population present in this region, and to study the interaction of these stars with the interstellar medium.
Methods: We analyzed some c…
Origin of the diffuse 4-8 keV emission in M 82
Gilli, R.; Iwasawa, K.; Gandhi, P. +2 more
We present the first spatially resolved, X-ray spectroscopic study of the 4−8 keV diffuse emission found in the central part of the nearby starburst galaxy M 82 on a few arcsecond scales. The new details that we see allow a number of important conclusions to be drawn on the nature of the hot gas and its origin as well as feedback on the interstell…
Study of Global Photospheric and Chromospheric Flows Using Local Correlation Tracking and Machine Learning Methods I: Methodology and Uncertainty Estimates
Xu, Yan; Denker, Carsten; Wang, Haimin +3 more
Cyclical variations of the solar magnetic fields, and hence the level of solar activity, are among the top interests of space weather research. Surface flows in global-scale, in particular differential rotation and meridional flows, play important roles in the solar dynamo that describes the origin and variation of solar magnetic fields. In princi…
Estimating the optical depth of Saturn's main rings using the Cassini Langmuir Probe
Arridge, Christopher S.; Wahlund, Jan-Erik; Xystouris, Georgios +1 more
A Langmuir Probe (LP) measures currents from incident charged particles as a function of the applied bias voltage. While onboard a spacecraft the particles are either originated from the surrounding plasma, or emitted (e.g. through photoemission) from the spacecraft itself. The obtained current-voltage curve reflects the properties of the plasma i…
Prolonged Record of Hydroclimatic Changes at Antoniadi Crater, Mars
Mangold, N.; Pajola, M.; Cremonese, G. +13 more
The first billion years of Martian geologic history consisted of surface environments and landscapes dramatically different from those seen today, with flowing liquid water sculpting river channels and ponding to form bodies of water. However, the hydro-climatic context, the frequency, and the duration under which these systems existed remain unce…
Rotational radial shear in the low solar photosphere
Corbard, T.; Faurobert, M.; Gelly, B. +2 more
Context. Radial differential rotation is an important physical ingredient in stellar dynamo theory. In the case of the Sun, heliosismology techniques have revealed the existence of a near-surface shear layer covering 15-20% of the upper convection zone. It was recently shown that the rotation velocity gradient is not uniform in this layer and that…