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Dynamics and Structure of Supergranulation
Kosovichev, A. G.; Duvall, T. L., Jr.; Berrilli, F. +1 more
In this paper we investigate the temporal evolution and geometric properties of solar supergranular features. For this purpose we apply an automatic feature-tracking algorithm to a 6-day time series of 18 near-surface flowmaps containing 548 target objects. Lifetimes are calculated by measuring the time elapsing between the birth and death of each…
Energy Crisis in the Superbubble DEM L192 (N51D)
Guerrero, Martín A.; Chu, You-Hua; Chen, C. -H. Rosie +2 more
Superbubbles surrounding OB associations provide ideal laboratories in which to study the stellar energy feedback problem, because the stellar energy input can be estimated from the observed stellar content of the OB associations, and the interstellar thermal and kinetic energies of superbubbles are well defined and easy to observe. We have used D…
Menzel 3: Dissecting the ant
Balick, B.; Corradi, R. L. M.; Santander-García, M. +1 more
The structure and kinematics of the bipolar nebula Mz 3 have been investigated by means of HST, CTIO and ESO images and spectra. At least four distinct outflows have been identified which, from the inside to the outside, are the following: a pair of bright bipolar lobes, two opposite highly collimated column-shaped outflows, a conical system of ra…
First comparisons of local ion measurements in the inner magnetosphere with energetic neutral atom magnetospheric image inversions: Cluster-CIS and IMAGE-HENA observations
Dunlop, Malcolm; Balogh, André; Dandouras, Iannis +9 more
Data provided by the CIS (Cluster Ion Spectrometry) instruments on board the Cluster spacecraft are used to survey recent crossings of the inner magnetosphere and ring current. CIS is capable of obtaining full three-dimensional ion distributions (about 0 to 40 keV/q) with one spacecraft spin time resolution and with mass-per-charge composition det…
An XMM-Newton observation of the dynamically active binary cluster A1750
Pratt, G. W.; Bourdin, H.; Sauvageot, J. -L. +1 more
We present results from the XMM-Newton observation of the binary cluster A1750 at z = 0.086. We have performed a detailed study of the surface brightness, temperature and entropy distribution and confirm that the two main clusters of the system (A1750 N and A1750 C) have just started to interact. From the temperature distribution, we calculate tha…
The Araucaria Project: An Improved Distance to the Sculptor Spiral Galaxy NGC 300 from Its Cepheid Variables
Udalski, Andrzej; Soszyński, Igor; Minniti, Dante +8 more
In a previous paper, we reported on the discovery of more than a hundred new Cepheid variables in the Sculptor Group spiral galaxy NGC 300 from wide-field images taken in the B and V photometric bands at ESO/La Silla. In this paper, we present additional VI data, derive improved periods and mean magnitudes for the variables, and construct period-l…
Lightning on Jupiter observed in the Hα line by the Cassini imaging science subsystem
West, Robert A.; Porco, Carolyn C.; Dyudina, Ulyana A. +4 more
Night side images of Jupiter taken by the Cassini Imaging Science Subsystem (ISS) camera with the H filter reveal four lightning clusters; two of them are repeated observations of the same storm. All of these flashes are associated with storm clouds seen a few hours earlier on the day side of Jupiter. Some of the clouds associated with lightning d…
The Nature of the Mid-Infrared Population from Optical Identifications of the ELAIS-S1 Sample
Pozzi, F.; Danese, L.; Alexander, D. M. +16 more
We present a multiwavelength catalog (15 µm, R-band, K-band, and 1.4 GHz flux) plus spectroscopic identifications for 406 15 µm sources detected in the European Large Area ISO Survey (ELAIS) region S1, over the flux density range 0.5<S15µm<150 mJy. Three hundred thirty-two (~82%) sources are optically identified …
Optical observations of Comet 67P/Churyumov-Gerasimenko
Rauer, H.; Weiler, M.; Helbert, J.
From longslit spectra obtained during the 1996 perihelion passage of Comet 67P/Churyumov-Gerasimenko, a CN production rate of (1.35 ± 0.35) × 1025 molecules s-1 was determined and an upper limit for the C3 production rate of 1 × 1025 molecules s-1 was derived. The dust color and dust activity …
Activity-related Changes in Local Solar Acoustic Mode Parameters from Michelson Doppler Imager and Global Oscillations Network Group
Howe, R.; Hill, F.; Hindman, B. W. +2 more
We use the ring-diagram technique of local helioseismology to study the amplitude and line width of high-degree solar acoustic modes from 474 days of data from the Michelson Doppler Imager Dynamics program, covering the period 1996-2002. The 2002 data are compared with contemporaneous data from the Global Oscillations Network Group network. The re…