Search Publications
Ionospheric total electron content of comet 67P/Churyumov-Gerasimenko
Henri, Pierre; Hajra, Rajkumar; Galand, Marina +6 more
We study the evolution of a cometary ionosphere, using approximately two years of plasma measurements by the Mutual Impedance Probe on board the Rosetta spacecraft monitoring comet 67P/Churyumov-Gerasimenko (67P) during August 2014-September 2016. The in situ plasma density measurements are utilized to estimate the altitude-integrated electron num…
Numerical simulation and data analysis of the 23 July 2012 SEP event observed by ACE, STEREO-A, and STEREO-B
Qin, G.; Qi, S. -Y.
An extremely powerful, superfast interplanetary coronal mass ejection (ICME) from the Sun on 23 July 2012 was detected by widely separated multiple spacecraft, namely STEREO-A, STEREO-B, and ACE, together with the ICME-driven shock and associated solar energetic particles (SEPs). We use the Parker spiral magnetic field model to analyze the relatio…
A survey for occultation astrometry of main belt: expected astrometric performances
Tanga, P.; Machado, P.; Corsaro, E. +1 more
Context. Occultations of stars by asteroids are an efficient method to study the properties of minor bodies, and can be exploited as tools to derive very precise asteroid astrometry relative to the target star. With the availability of stellar astrometry thanks to the ESA mission Gaia, the frequency of good predictions and the quality of the astro…
Herschel-PACS photometry of the five major moons of Uranus
Balog, Z.; Marton, G.; Müller, T. G. +3 more
Aims: We aim to determine far-infrared fluxes at 70, 100, and 160 µm for the five major Uranus satellites, Titania, Oberon, Umbriel, Ariel, and Miranda. Our study is based on the available calibration observations at wavelengths taken with the PACS photometer aboard the Herschel Space Observatory.
Methods: The bright image of Uranu…
Characterization of very wide companion candidates to young stars with planets and disks
Alcalá, J. M.; D'Orazi, V.; Frasca, A. +6 more
Discovering wide companions of stellar systems allows us to constrain the dynamical environment and age of the latter. We studied four probable wide companions of four different stellar systems. The candidates were selected mainly based on their similar kinematic properties to the central star using Gaia DR2. The central stars are V4046 Sgr, HIP 7…
Proton-proton collisional age to order solar wind types
Wimmer-Schweingruber, Robert F.; Berger, Lars; Heidrich-Meisner, Verena
Context. The properties of a solar wind stream are determined by its source region and by transport effects. Independently of the solar wind type, the solar wind measured in situ is always affected by both. This means that reliably determining the solar wind type from in situ observations is useful for the analysis of its solar origin and its evol…
Accretion in low-mass members of the Orion Nebula Cluster with young transition disks
Alencar, S. H. P.; Gameiro, J. F.; Lima, J. J. G. +3 more
Context. Although the Orion Nebula Cluster is one of the most studied clusters in the solar neighborhood, the evolution of the very low-mass members (M* < 0.25 M⊙) has not been fully addressed due to their faintness.
Aims: Our goal is to verify if some young and very low-mass objects in the Orion Nebula Cluster show e…
More planetary candidates from K2 Campaign 5 using TRAN_K2
Kovacs, Geza
Context. The exquisite precision of space-based photometric surveys and the unavoidable presence of instrumental systematics and intrinsic stellar variability call for the development of sophisticated methods that distinguish these signal components from those caused by planetary transits.
Aims: Here, we introduce the standalone Fortran code …
RESIK and RHESSI observations of the 20 September 2002 flare
Siarkowski, M.; Falewicz, R.; Kepa, A. +1 more
Context. Soft X-ray spectra (3.33 Å-6.15 Å) from the RESIK instrument on CORONAS-F constitute a unique database for the study of the physical conditions of solar flare plasmas, enabling the calculation of differential emission measures. The two RESIK channels for the shortest wavelengths overlap with the lower end of the Ramaty High Energy Solar S…
Magnetic Rayleigh-Taylor instability at a contact discontinuity with an oblique magnetic field
Erdélyi, R.; Ballai, I.; Vickers, E.
Aims: We investigate the nature of the magnetic Rayleigh-Taylor instability at a density interface that is permeated by an oblique homogeneous magnetic field in an incompressible limit.
Methods: Using the system of linearised ideal incompressible magnetohydrodynamics equations, we derive the dispersion relation for perturbations of the c…