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Catalogue of ISO LWS observations of asteroids
Müller, T. G.; Hormuth, F.
Context: The long wavelength spectrometer (LWS) onboard the infrared space observatory (ISO) observed the four large main-belt asteroids
A Possible Supernova Remnant High Above the Galactic Disk
Henley, David B.; Shelton, Robin L.
We present the analysis of three Suzaku observations of a bright arc in the ROSAT All-Sky Survey 1/4 keV maps at l ≈ 247°, b ≈ -64°. In particular, we have tested the hypothesis that the arc is the edge of a bubble blown by an extraplanar supernova. One pointing direction is near the brightest part of the arc, one is toward the interior of the hyp…
Spectral analysis of 3D MHD models of coronal structures
Peter, Hardi; Zacharias, Pia; Bingert, Sven
We study extreme-ultraviolet emission line spectra derived from three-dimensional magnetohydrodynamic models of structures in the corona. In order to investigate the effects of increased magnetic activity at photospheric levels in a numerical experiment, a much higher magnetic flux density is applied at the photosphere as compared to the Sun. Thus…
Mirror waves and mode transition observed in the magnetosheath by Double Star TC-1
Zhang, T. L.; Wang, C.; Volwerk, M. +2 more
The Double Star TC-1 magnetosheath pass on 26 February 2004 is used to investigate magnetic field fluctuations. Strong compressional signatures which last for more than an hour have been found near the magnetopause behind a quasi-perpendicular bow shock. These compressional structures are most likely mirror mode waves. There is a clear wave transi…
Star Clusters in Pseudobulges of Spiral Galaxies
Stiavelli, Massimo; Scarlata, Claudia; Wyse, Rosemary F. G. +3 more
We present a study of the properties of the star-cluster systems around pseudobulges of late-type spiral galaxies using a sample of 11 galaxies with distances from 17 Mpc to 37 Mpc. Star clusters are identified from multiband Hubble Space Telescope ACS and WFPC2 imaging data by combining detections in three bands (F435W and F814W with ACS and F606…
Comparison of High-Degree Solar Acoustic Frequencies and Asymmetry Between Velocity and Intensity Data
Hill, F.; Antia, H. M.; Jain, K. +1 more
Using the local helioseismic technique of ring diagram we analyze the frequencies of high-degree f- and p-modes derived from both velocity and continuum intensity data observed by Michelson Doppler Imager. Fitting the spectra with asymmetric peak profiles, we find that the asymmetry associated with velocity line profiles is negative for all freque…
Kinetic Alfvén waves turbulence in the Earth's magnetosphere
Sharma, R. P.; Kumar, Sachin
The numerical simulations of the model equation governing the nonlinear dynamics of kinetic Alfvén waves in the intermediate-β plasmas are performed. When the nonlinearity arises due to the ponderomotive force driven density perturbations of kinetic Alfvén waves, the model equation turns out to be a modified nonlinear Schrödinger equation. This ha…
HD 190336 a new beta Cep star
Hajdu, G.; Jurcsik, J.; Sodor, A.
HD 190336 (B0.7 II-III) is shown to be a multiperiodic beta Cep variable based on the publicly available HAT-5, Integral/OMC, and Hipparcos data.
Kinetic theory for the ion humps at the foot of the Earth's bow shock
Krasnoselskikh, V. V.; Jovanović, D.
The nonlinear kinetic theory is presented for the ion acoustic perturbations at the foot of the Earth's quasiperpendicular bow shock, that is characterized by weakly magnetized electrons and unmagnetized ions. The streaming ions, due to the reflection of the solar wind ions from the shock, provide the free energy source for the linear instability …
Cluster observations and numerical modeling of energy-dispersed ionospheric H+ ions bouncing at the plasma sheet boundary layer
Frey, H. U.; Bosqued, J. M.; Marchaudon, A. +5 more
The Cluster mission offers a unique opportunity to investigate the origin of the energy-dispersed ion structures frequently observed at 4.5-5 R E altitude in the auroral region. We present a detailed study of the 14 February 2001 northern pass, characterized by the successive observation by three spacecraft of a series of energy-dispe…