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IUE observations of star formation in a cooling flow
Hansen, L.; JØrgensen, H. E.; NØrgaard-Nielsen, H. U.
Star formation in cooling flows is usually found to have an initial mass function deficient in massive stars, but the center of the cooling flow in Hydra A has been shown to contain a significant number of early type stars. Here we use UV-spectra obtained with the IUE satellite together with ground based data to constrain the nature of this young …
High resolution solar ultraviolet measurements
Vial, J. -C.; Wilhelm, K.; Curdt, W. +6 more
The increase of our understanding of the processes acting in the solar corona and maintaining it is strongly dependent on the quality of the data that are obtained to check theories. The fine structure of the solar atmosphere seen from the photosphere and extending to the hottest parts of the corona requires data with high resolution in all parame…
European Network for the Numerical Simulation of Space Plasmas
Roux, A.; Chanteur, G.
Energetic Particle Acceleration at Corotating Interaction Regions: Ulysses Results
Balogh, A.; Forsyth, R. J.; Desai, M. I. +3 more
Plasma wave observations from the ULYSSES spacecraft's fast heliographic latitude scan
MacDowall, R. J.; Lin, N.; Hess, R. A. +1 more
Plasma wave observations obtained by the Ulysses spacecraft in 1994 and 1995 over a heliographic latitude range of -70 to +70 deg show significantly different wave characteristics inside and outside the streamer belt. Langmuir wave bursts are most commonly found in magnetic holes, especially in fast solar wind. The intensities of ion-acoustic-like…
Cluster Mission Operations
Ferri, P.; Warhaut, M.
Nonlinear electromagnetic waves and spherical arc-polarized waves in space plasmas
Neubauer, Fritz M.; Tsurutani, Bruce T.; Glassmeier, Karl-Heinz +3 more
We review observations of nonlinear plasma waves detected by interplanetary spacecraft. For this paper we will focus primarily on the phase-steepened properties of such waves. Plasma waves at comet Giacobini - Zinner measured by the international cometary explorer (ICE), at comets Halley and Grigg - Skjellerup measured by Giotto, and interplanetar…
Interactive Deconvolution with Error Analysis (IDEA) in astronomical imaging: Application to aberrated HST images on SN 1987A, M 87 and 3C 66B
Roques, S.; Fraix-Burnet, D.; Bouyoucef, K.
The regularized reconstruction algorithm {Interactive Deconvolution with Error Analysis} (IDEA) is presented. One of its main advantages is to control the error propagation and to provide an estimation of the quality of the deconvolved image. IDEA is compared with two popular probabilistic methods: Richardson-Lucy and Maximum Entropy. These three …
Estimate of the Energy Flux from Time-Distance Analysis
Ryutova, M.
In this Letter we show that time-distance measurements in helioseismology can be used to estimate the energy flux on the solar surface. Nonreciprocity of travel time along the ray path and different parity properties of sound speed, flow velocity, and magnetic field allow one to obtain information on large-scale distribution of plasma flows and ma…
Low frequency plasma waves in the solar wind: from ecliptic plane to the solar polar regions
Balogh, A.; Forsyth, R. J.; Lin, Naiguo +4 more
<B>Traveling from the ecliptic to the solar polar regions, Ulysses observed wave activity below the local electron cyclotron frequency, f_ce. In regions near the heliospheric current sheet (hereafter HCS regions), two wave modes are observed: (1) whistler mode electromagnetic waves near interplanetary shocks and during periods of rapidly inc…