Search Publications
Signature of mass supply to quiet coronal loops
Tu, C. -Y.; Marsch, E.; Tian, H. +2 more
Aims:The physical implication of large blue shift of Ne viii in the quiet Sun region is investigated in this paper.
Methods: We compare the significant Ne viii blue shifts, which are visible as large blue patches on the Doppler-shift map of a middle-latitude quiet-Sun region observed by SUMER, with the coronal magnetic-field structures as reco…
Parametric analysis of positive amplitude electron acoustic solitary waves in a magnetized plasma and its application to boundary layers
Winningham, J. D.; Lakhina, G. S.; Pickett, J. S. +3 more
The existence domain of a fully nonlinear positive amplitude electron acoustic solitary wave has been studied in a four-component plasma composed of warm magnetized electrons, warm electron beam, and energetic multi-ion species with ions hotter than the electrons (Ti > Te). A Sagdeev pseudopotential technique has been used…
Lunar degree 2 potential Love number determination from satellite tracking data
Matsumoto, K.; Goossens, S.
The lunar potential Love number k 2 has been determined using available satellite tracking data coming from the Lunar Orbiters I-V, the Apollo 15 and 16 subsatellites, Clementine and Lunar Prospector. Some SMART-1 spacecraft tracking data are also included. A previous determination using spacecraft data reported k 2 = 0.026 +…
Identification of a new outflow channel on Mars in Syrtis Major Planum using HRSC/MEx data
Mangold, N.; Neukum, G.; Hiesinger, H. +6 more
Syrtis Major Planum is a volcanic plain dominated by lava flows. High resolution stereo camera (HRSC) images of the northern Syrtis Major region display erosional features such as grooves, teardrop-shaped islands and valleys. These landforms are characteristics of outflow channels seen on Mars, therefore implying that a flood event took place in t…
Hubble Space Telescope Near-infrared Snapshot Survey of 3CR Radio Source Counterparts. II. An Atlas and Inventory of the Host Galaxies, Mergers, and Companions
O'Dea, Christopher P.; Baum, Stefi; Chiaberge, Marco +10 more
We present the second part of an H-band (1.6 µm) "atlas" of z < 0.3 3CR radio galaxies, using the Hubble Space Telescope Near Infrared Camera and Multi-Object Spectrometer (HST NICMOS2). We present new imaging for 21 recently acquired sources and host galaxy modeling for the full sample of 101 (including 11 archival)—an 87% completion rat…
A nanoflare model for active region radiance: application of artificial neural networks
Solanki, S. K.; Innes, D. E.; Safari, H. +2 more
Context: Nanoflares are small impulsive bursts of energy that blend with and possibly make up much of the solar background emission. Determining their frequency and energy input is central to understanding the heating of the solar corona. One method is to extrapolate the energy frequency distribution of larger individually observed flares to lower…
Thermal observations of Saturn's main rings by Cassini CIRS: Phase, emission and solar elevation dependence
Altobelli, Nicolas; Spilker, Linda J.; Leyrat, Cedric +1 more
Two and a half years after Saturn orbit insertion (SOI) the Cassini composite infrared spectrometer (CIRS) has acquired an extensive set of thermal measurements (including physical temperature and filling factor) of Saturn's main rings for a number of different viewing geometries, most of which are not available from Earth. Thermal mapping of both…
Effect of a northward turning of the interplanetary magnetic field on cusp precipitation as observed by Cluster
Berchem, J.; Escoubet, C. P.; Pitout, F. +10 more
The immediate effect of the rotation of the interplanetary magnetic field (IMF) from southward to northward on cusp precipitation has been rarely observed by a polar orbiting satellite in the past. The four Cluster spacecraft observed such an event on 23 September 2004 as they were crossing the polar cusp within 2-16 min from each other. Between t…
DN Bootis: A low mass-ratio W UMa-type contact binary
Selam, S. O.; Özavcı, İ.; Nelson, R. H. +2 more
New photoelectric BVR light curves and radial velocity curves were obtained for the HIPPARCOS discovery DN Boo at the TÜBİTAK National Observatory of Turkey (TUG) and Dominion Astrophysical Observatory (DAO), respectively, to determine physical nature of the variable. The character of the obtained light curves and double-lined spectroscopic struct…
Suzaku Observation of the TeV Blazar 1ES 1218+304: Clues on Particle Acceleration in an Extreme TeV Blazar
Kataoka, J.; Madejski, G. M.; Sato, R. +3 more
We observed the TeV blazar 1ES 1218+304 with the X-ray astronomy satellite Suzaku in 2006 May. At the beginning of the 2 day continuous observation, we detected a large flare in which the 5-10 keV flux changed by a factor of ~2 on a timescale of 5 × 104 s. During the flare, the increase in the hard X-ray flux clearly lagged behind that …