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Comparison of LOS Doppler Velocities and Non-Thermal Line Widths in the Off-Limb Solar Corona Measured Simultaneously by CoMP and Ninode/EIS
Lee, Kyoung-Sun; Cho, Kyung-Suk; Lee, Jae-Ok +1 more
Observations of line of sight (LOS) Doppler velocity and non-thermal line width in the off-limb solar corona are often used for investigating the Alfvén wave signatures in the corona. In this study, we compare LOS Doppler velocities and non-thermal line widths obtained simultaneously from two different instruments, Coronal Multichannel Polarimeter…
Dust devils: Characteristics of the forward motion from a Saharan survey
Esposito, Francesca; Ruggeri, Alan Cosimo; Silvestro, Simone +6 more
Dust devils have been proposed as a tool to investigate martian near-ground wind conditions. However, further studies are needed in order to fully understand how background atmospheric conditions affect dust devil forward motion. One of the main issues is related to the lack of synchronous acquisition of the dust devils forward speed and ambient w…
Predicting far-infrared maps of galaxies via machine learning techniques
Baes, Maarten; Dobbels, Wouter
Context. The ultraviolet (UV) to sub-millimetre spectral energy distribution of galaxies can be roughly divided into two sections: the stellar emission (attenuated by dust) at UV to near-infrared wavelengths and dust emission at longer wavelengths. In Dobbels et al. (2020, A&A, 634, A57), we show that these two sections are strongly related, a…
The Stellar Content of H72.97-69.39, a Potential Super Star Cluster in the Making
Hirschauer, Alec S.; Meixner, Margaret; Zinnecker, Hans +2 more
Young massive clusters and super star clusters (SSCs) represent an extreme mode of star formation. Far-infrared imaging of the Magellanic Clouds has identified one potential embedded SSC, HSO BMHERICC J72.971176-69.391112 (H72.97-69.39 in short), in the southwest outskirts of the Large Magellanic Cloud. We present Gemini Flamingos 2 and GSAOI near…
Chrono-morphologic surface- a parameter to quantify craters' heterogeneity and its applicability on Mars
Căpitan, Radu Dan
On any solid planetary surface, crater populations in any given region show variations in their geomorphology related to their initial formation conditions and to their post-formation modifications. This ubiqutous and random distribution of craters in time and space defines a universal cratering characteristic- the craters heterogeneity, that is p…
Speckle Interferometry at the U.S. Naval Observatory. XXIV
Matson, Rachel A.; Williams, Stephen J.; Mason, Brian D. +5 more
The results of 3611 intensified CCD observations of double stars, made with the 26 inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over 2000 short-exposure images. These observations are averaged into 1857 mean relative positions and range in separation from 0"341 to 128"644, wi…
Spatial Distribution of Ultraviolet Emission from Cometary Activity at 67P/Churyumov-Gerasimenko
Parker, Joel Wm.; Bertaux, Jean-Loup; Weaver, Harold A. +16 more
The Alice ultraviolet spectrograph on board the Rosetta orbiter provided the first near-nucleus ultraviolet observations of a cometary coma from arrival at comet 67P/Churyumov-Gerasimenko in 2014 August through 2016 September. The characterization of atomic and molecular emissions in the coma revealed the unexpected contribution of dissociative el…
Improving light curve parameters of exoplanets based on TESS data
Parviainen, H.; Maliuk, A.; Vítková, M. +1 more
We revise parameters of four transiting hot Jupiter planets discovered by ground-based surveys. We use follow-up observations carried by TESS mission together with PyTransit software. Space telescopes like TESS provide better coverage and photometry precision than ground-based telescopes. PyTransit is fast and user-friendly exoplanet transit light…
Analysis of modern astrometric catalogues in the Gaia era
Akhmetov, V. S.; Fedorov, P. N.; Tsvetkova, V. S. +1 more
We investigate the systems of proper motions of stars in the ground-based catalogues HSOY, UCAC5, GPS1, and PMA derived by combining with the Gaia DR1 space data. Assuming the systematic differences of stellar proper motions of two catalogues to be caused by the mutual solid-body rotation and glide of the coordinate systems produced by the data of…
On the horizontal currents over the Martian magnetic cusp
Withers, Paul; Majeed, Tariq; AlMutawa, Shahd A. +4 more
Localized crustal magnetization over heavily cratered southern hemisphere at Mars gives rise to open magnetic field configurations which interact with the solar wind magnetic field to form magnetic cusp. The downward acceleration of energetic electrons in these cusps can produce aurora and an extended topside ionospheric structure over regions of …