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The correlation length of ULF waves around Venus: VEX observations
Fränz, M.; Zhang, T. L.; Bolzan, M. J. A. +2 more
A study of the correlation length of ultra-low frequency (ULF) waves around Venus was developed using electron density and magnetic field data obtained from the Analyzer of Space Plasmas and Energetic Atoms (ASPERA-4) and magnetometer (MAG), respectively, on board of the mission Venus Express (VEX). The analysis was conducted using the whole inter…
Geozesy and geophysics of Mercury: Prospects in view of the BepiColombo mission
Hussmann, Hauke; Stark, Alexander
The BepiColombo mission, which is a joint mission of the European Space Agency (ESA) and the Japan Aerospace Exploration Agency (JAXA), was launched successfully on October 20, 2018 from Kourou, French Guyana. The spacecraft is currently on its 7 yr cruise to Mercury. The main science campaign at Mercury will begin, however, no earlier than spring…
Localized Amplification of Magnetic Field in the Solar Photosphere Associated with a Rapid Moving Pore
Yang, Bo; Yang, Jiayan; Bi, Yi +4 more
In the Sun, the flows of hot plasma drive a dynamo that generates a global magnetic field as well as smaller-scale local fields. The existence of a magnetic field in turn affects the motion of plasma so that complex dynamic characteristics can be observed. In this Letter, we give an analysis on the localized amplification of magnetic fields in fro…
Validating post-AGB candidates in the LMC and SMC using SALT spectra
Szczerba, R.; Gezer, I.; Hrivnak, B. J. +8 more
We selected a sample of post-AGB candidates in the Magellanic Clouds on the basis of their near- and mid-infrared colour characteristics. Fifteen of the most optically bright post-AGB candidates were observed with the South African Large Telescope in order to determine their stellar parameters and thus to validate or discriminate their nature as p…
Characterising young visual M-dwarf binaries with near-infrared integral field spectra
Calissendorff, Per; Janson, Markus; Bonnefoy, Mickaël
We present the results from an integral field spectroscopy study of seven close visual binary pairs of young M-dwarf multiple systems. The target systems are part of the astrometric monitoring AstraLux programme, surveying hundreds of M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital constraints. Our new VLT/SINFONI dat…
On the correctness of orbital solutions obtained from a small set of points. Orbit of HIP 53731
Mitrofanova, Arina; Dyachenko, Vladimir; Beskakotov, Anatoly +4 more
HIP 53731 is a binary consisting of stars of the spectral types K0 and K9. The orbit of this object was constructed previously by Cvetković et al. and improved by Tokovinin. It should be noted that there is a 180° ambiguity in the position angles of some published measurements. Speckle interferometric observations were obtained in 2007-2020 (21 me…
Radio Sounding Measurements of the Solar Corona Using Giant Pulses of the Crab Pulsar in 2018
Tokumaru, Munetoshi; Terasawa, Toshio; Sekido, Mamoru +2 more
Observations of the Crab pulsar at 327 MHz were made at the Toyokawa Observatory of the Institute for Space-Earth Environmental Research, during the solar occultation in mid-June 2018 to investigate the coronal plasma density in the weak sunspot cycle, Cycle 24. The dispersion measurements (DMs) were determined using giant pulses detected from obs…
Kepler Binary Stars in the NGC 6819 Open Cluster: KIC 5113146 and KIC 5111815
Bilir, Selçuk; Soydugan, Faruk; Soydugan, Esin +1 more
In this study, an investigation of two double-lined binary stars KIC 5113146 and KIC 5111815 in the NGC 6819 open cluster is presented based on both photometric and spectroscopic data. Simultaneous analysis of light and radial velocity curves was made and the absolute parameters of the systems' components were determined for the first time. We fin…
Discovery of recombining plasma associated with the candidate supernova remnant G189.6+3.3 with Suzaku
Nobukawa, Kumiko K.; Yamauchi, Shigeo; Pannuti, Thomas G. +1 more
We present the results of an X-ray spectral analysis of the northeast region of the candidate supernova remnant G189.6+3.3 with Suzaku. K-shell lines from highly ionized Ne, Mg, Si, and S were detected in the spectrum for the first time. In addition, a radiative recombining continuum (RRC) from He-like Si was clearly seen near 2.5 keV. This detect…
Seasonal thermal inertia variations at Gale crater: Role of active surface deposition phenomena
Rangarajan, Vidhya Ganesh; Ghosh, Mili
Thermal inertia has been found to play a significant role in planetary remote sensing applications, forming the basis of potentially all major lithological discriminations of the planetary surface. It has always been visualised to serve as a distinctive thermal property of the surface with its values remaining fairly constant at least for a short …