Search Publications
Heliospheric energetic neutral atoms: Non-stationary modelling and comparison with IBEX-Hi data
Izmodenov, V. V.; Alexashov, D. B.; Baliukin, I. I.
The interstellar boundary explorer (IBEX) has been measuring fluxes of the energetic neutral atoms (ENAs) using the IBEX-Hi (0.3-6 keV) instrument since 2008. We have developed a numerical time-depended code to calculate globally distributed flux (GDF) of hydrogen ENAs employing both (1) 3D kinetic-MHD model of the global heliosphere and (2) recon…
The stellar variability noise floor for transiting exoplanet photometry with PLATO
Hawley, Suzanne L.; Agol, Eric; Morris, Brett M. +2 more
One of the main science motivations for the ESA PLAnetary Transit and Oscillations (PLATO) mission is to measure exoplanet transit radii with 3 per cent precision. In addition to flares and starspots, stellar oscillations and granulation will enforce fundamental noise floors for transiting exoplanet radius measurements. We simulate light curves of…
Failed prominence eruptions near 24 cycle maximum
Filippov, B.
We analyse 16 failed filament eruptions observed near 24 solar cycle maximum from 2013 May to 2014 July. No significant rotation of filament spines is observed during the ascent in all studied failed eruptions, which does not support kink-instability mechanism of triggering the eruptions. We calculate potential magnetic field distributions in the …
Effects of density on the oxygen ionization equilibrium in collisional plasmas
Del Zanna, G.; Dufresne, R. P.; Badnell, N. R.
The ion populations most frequently adopted for diagnostics in collisional plasmas are derived from the density independent coronal approximation. In higher density, lower temperature conditions, ionization rates are enhanced once metastable levels become populated, and recombination rates are suppressed if ions recombine into Rydberg levels. As a…
A new method of determining brightness and size of cometary nuclei
Paradowski, Mieczyslaw Leszek
This paper presents a new method of determining the brightness and size of cometary nuclei that has been applied to the following 32 observed comets: 2P/Encke, 29P/Schwassmann-Wachmann 1, 102P/Shoemaker 1, 103P/Hartley 2, 168P/Hergenrother, 189P/NEAT, 260P/McNaught, 315P/LONEOS, P/2012 NJ (La Sagra), P/2013 J2 (McNaught), C/2006 S3 (LONEOS), C/200…
Theoretical studies of comets in the 55 Cancri system
Cuntz, Manfred; Dvorak, Rudolf; Loibnegger, Birgit
We present orbital integrations for various Jupiter family comets (JFCs) in the 55 Cancri system. This star is known to possess (at least) five planets with masses ranging from super-Earth to Jupiter-type. Furthermore, according to observational constraints, there is a space without planets between ∼0.8 and ∼5.7 au, offering the principal possibil…
White-light solar corona structure observed by naked eye and processed images
Rušin, Vojtech; Prikryl, Paul; Prikryl, Emil A.
Light and dark adaptation and luminance contrast enhancement are well-known characteristics of human vision that allow us to observe a wide range of light intensity not fully captured in standard camera images. The naked-eye observations of total eclipses, some recorded with spectacular detail in artists' paintings, reveal structure that is consis…