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Unusual Zebra Patterns in the Decimeter Wave Band
Tan, Chengming; Yan, Yihua; Chernov, G. P. +2 more
An analysis of new observations showing fine structures consisting of narrowband fiber bursts as substructures of large-scale zebra-pattern stripes is carried out. We study four events using spectral observations taken with a newly built spectrometer located at the Huairou station, China, in the frequency range of 1.1 - 2.0 GHz with extremely high…
Derivation of inner magnetospheric electric field (UNH-IMEF) model using Cluster data set
Khotyaintsev, Y.; Torbert, R. B.; Matsui, H. +3 more
We derive an inner magnetospheric electric field (UNH-IMEF) model at L=2 10 using primarily Cluster electric field data for more than 5 years between February 2001 and October 2006. This electric field data set is divided into several ranges of the interplanetary electric field (IEF) values measured by ACE. As ring current simulations which requir…
Gomez's Hamburger (IRAS 18059-3211): a pre main-sequence A-type star
Bujarrabal, V.; Young, K.; Fong, D.
Aims: We study the nature of Gomez's Hamburger (IRAS 18059-3211; GoHam), a nebula that has been proposed to be a post-AGB object. Such a classification has not been confirmed; instead, we argue that it will be a key object in the study of disks rotating around young stars.
Methods: We present high-resolution SMA maps of CO J = 2-1 in Gomez's H…
Automatic Recognition and Characterisation of Supergranular Cells from Photospheric Velocity Fields
Potts, H. E.; Diver, D. A.
We have developed an exceptionally noise-resistant method for accurate and automatic identification of supergranular cell boundaries from velocity measurements. Because of its high noise tolerance the algorithm can produce reliable cell patterns with only very small amounts of smoothing of the source data in comparison to conventional methods. In …
Magnetized Mars: Transformation of Earth-like magnetosphere to Venus-like induced magnetosphere
Kallio, E.; Janhunen, P.; Barabash, S. +1 more
Using a global numerical model, we have studied how the present Martian magnetosphere may have looked in the past when the planet had a global intrinsic magnetic field. A Mars version (HYB-Mars) of the self-consistent quasi-neutral hybrid model was used which treats the ions as particles and the electrons as a massless charge-neutralizing fluid. W…
INTEGRAL observations of PSR J1811-1925 and its associated pulsar wind nebula
de Rosa, A.; Hill, A. B.; Bird, A. J. +6 more
We present spectral measurements made in the soft (20-100keV) γ-ray band of the region containing the composite supernova remnant G11.2-0.3 and its associated pulsar PSR J1811-1925. Analysis of INTEGRAL/IBIS data allows characterization of the system above 10keV. The IBIS spectrum is best fitted by a power law having photon index Γ = 1.8+0.4<…
Cassini RADAR constraint on Titan's winter polar precipitation
Lorenz, R. D.; West, R. D.; Johnson, W. T. K.
The Cassini RADAR instrument made a dedicated cloud backscatter observation near Titan's north pole, presently in winter darkness, to constrain the precipitation of material onto the surface. The detection limit is ∼5 orders of magnitude above that expected in methane rainstorms, and rules out 'drizzle' of more than ∼10cm/yr, placing constraints o…
EISCAT and Cluster observations in the vicinity of the dynamical polar cap boundary
Dandouras, I.; Amm, O.; Fazakerley, A. +5 more
The dynamics of the polar cap boundary and auroral oval in the nightside ionosphere are studied during late expansion and recovery of a substorm from the region between Tromsø (66.6° cgmLat) and Longyearbyen (75.2° cgmLat) on 27 February 2004 by using the coordinated EISCAT incoherent scatter radar, MIRACLE magnetometer and Cluster satellite measu…
Drift-Alfvén vortices at the ion Larmor radius scale
Krasnoselskikh, V. V.; Pokhotelov, O. A.; Onishchenko, O. G.
The theory of nonlinear drift-Alfvén waves with the spatial scales comparable to the ion Larmor radius is developed. It is shown that the set of equations describing the nonlinear dynamics of drift-Alfvén waves in a quasistationary regime admits a solution in the form of a solitary dipole vortex. The vortex structures propagating perpendicular to …
XMM-Newton Observations of the Nuclei of the Radio Galaxies 3C 305, DA 240, and 4C 73.08
Lee, Julia C.; Kraft, Ralph P.; Birkinshaw, Mark +4 more
We present new XMM-Newton EPIC observations of the nuclei of the nearby radio galaxies 3C 305, DA 240, and 4C 73.08, and investigate the origin of their nuclear X-ray emission. The nuclei of the three sources appear to have different relative contributions of accretion- and jet-related X-ray emission, as expected based on earlier work. The X-ray s…