Search Publications
The [Fe/H] Dependence on the Ca ii- MV Relationship
Pancino, E.; Wallerstein, George; Gomez, T. A.
We have examined the Wilson-Bappu effect, a relationship between the absolute magnitude of the star, MV, and the logarithm of the Ca ii emission width, W0, over the largest MV range to date, +13 to -5, covering M-dwarfs to type Ia supergiants. We used an extensive literature, the latest Hipparcos reduction, data fr…
Wave mechanism of the magnetospheric convection
Leonovich, A. S.
The problem of momentum transfer from the solar wind to the geotail via magnetosonic waves has been solved. The structure of the wave field of monochromatic MHD oscillations is calculated in a cylindrical model of the geotail with a background plasma distribution typical of the geotail lobes. Fast magnetosonic waves entering the magnetosphere from…
Dynamics of polar plumes observed during the total solar eclipse of August 1, 2008
Barczynski, K.; Rušin, V.; Saniga, M. +1 more
We study dynamics of polar plumes observed during the 2008 eclipse from three ground-based sites and the Hinode satellite. The speed of apparent upward propagation, as inferred from the changes of brightness within each plume, is found to lie in the range from 30 to 100 km s-1. Some white-light plumes located in polar coronal holes were…
Kinematic Modeling of Distant Galaxies
Kipper, Rain; Tempel, Elmo; Tamm, Antti
Evolution of galaxies is one of the most actual topics in astrophysics. Among the most important factors determining the evolution are two galactic components which are difficult or even impossible to detect optically: the gaseous disks and the dark matter halo. We use deep Hubble Space Telescope images to construct a two-component (bulge + disk) …
A Panoramic View of the Asteroids in the Inner Solar System with AKARI
Usui, F.; Hasegawa, S.; Kuroda, D. +5 more
Simulated performance of a single pixel PIN spectrometer SCXM equipped with a concentrator optics in Solar coronal X-ray observations
Alha, L.; Huovelin, J.; Nevalainen, J.
In this paper we present simulated solar coronal X-ray observations to verify the sensitivity of a new hypothetical instrument design. These simulations are folded through this X-ray spectrometer having a moderate size circular field of view (FoV) of 1.6°. This SCXM (Solar Coronal X-ray Mapper) is designed to compose of a single pixel silicon PIN …
Bursty synchrotron intensity variations of Jovian 6-cm radio emissions and Jupiter's quasi-periodic polar activities
Lou, Yu-Qing; Song, Huagang; Liu, Yinyu +1 more
With reference to Jupiter's south polar quasi-periodic 40-50 min (QP-40) activities and the model scenario for global QP-40 magneto-inertial oscillations of the Jovian inner radiation belt (IRB), we validate relevant predictions and confirmations by amassing empirical evidence from Ulysses, Cassini, Chandra, Galileo, XMM-Newton and the Advanced Co…
Solar stellar and substellar environment. I. Location in the galaxy and catalogues
Zakhozhay, V. A.; Babenko, M. O.
Structure of the solar neighborhoods (ten parsecs space, Local stellar system and the Gould Belt), their place in the Galaxy and the distance from its center are analyzed. For the region within 10 pc from the Sun, except the stellar component, the contents of extrasolar planets and protoplanetary disks are presented. The catalogues of closest to S…
Radiation processes in the Seyfert galaxy NGC 4151
Eriksson, M.
Aims: The main aim of this work was to investigate if the radiative process photoexcitation by accidental resonance (PAR) is producing Fe II lines in the UV region of NGC 4151. At the same time I searched for collisionally excited Fe II emission. While doing so, the broad line region (BLR), intermediate line region (ILR) and narrow line regio…
Erratum: "Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347" (2012, ApJ, 756, 149)
Acero, Fabio; Klochkov, Dmitry; Bamba, Aya +7 more