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The wave surveyor technique for fast plasma wave detection in multi-spacecraft data
Narita, Y.; Constantinescu, O. D.; Vogt, J.
Multi-satellite missions like Cluster allow to study the full spatio-temporal variability of plasma processes in near-Earth space, and both the frequency and the wave vector dependence of dispersion relations can be reconstructed. Existing wave analysis methods include high-resolution beamformers like the wave telescope or k-filtering technique, a…
A peculiar planetary nebula candidate in a globular cluster in the Fornax dwarf spheroidal galaxy
Larsen, S. S.
Context: Until now, only one planetary nebula (PN) has been known in the Fornax dwarf spheroidal galaxy.
Aims: The discovery of a second PN candidate, associated with one of the 5 globular clusters in the Fornax dwarf, is reported.
Methods: Spectra of the globular cluster H5, obtained with the UVES echelle spectrograph on the ESO Very Larg…
Trouble for AGN Feedback? The Puzzle of the Core of the Galaxy Cluster AWM 4
Buote, David A.; Brighenti, Fabrizio; Mathews, William G. +1 more
The core of the relaxed cluster AWM 4 is characterized by a unique combination of properties which defy a popular scenario for AGN heating of cluster cores. A flat inner temperature profile is indicative of a past, major heating episode which completely erased the cool core, as testified by the high central cooling time (gtrsim3 Gyr) and by the hi…
Evidence for Iroshnikov-Kraichnan-Type Turbulence in the Solar Wind Upstream of Interplanetary Traveling Shocks
Wurz, P.; Hilchenbach, M.; Smith, C. W. +3 more
We analyze suprathermal ions and plasma wave spectra upstream of interplanetary shocks driven by coronal mass ejection events. In particular, we analyze the competition between two processes: (1) the upstream wave generation by suprathermal protons accelerated at the shock, and (2) the cascading of wave energy in the inertial range of solar wind t…
Extended SuperDARN and IMAGE observations for northward IMF: Evidence for dual lobe reconnection
Milan, S. E.; Amata, E.; Retinò, A. +4 more
We present observations of ionospheric convection in the Northern Hemisphere made by the SuperDARN radar network during a 3 h period on 3 December 2001. The interplanetary magnetic field (IMF) during the time of observations is predominately northward with the B y component changing from positive to slightly negative. During this peri…
First observation of energetic neutral atoms in the Venus environment
Coates, A. J.; Kallio, E.; Fedorov, A. +48 more
The ASPERA-4 instrument on board the Venus Express spacecraft offers for the first time the possibility to directly measure the emission of energetic neutral atoms (ENAs) in the vicinity of Venus. When the spacecraft is inside the Venus shadow a distinct signal of hydrogen ENAs usually is detected. It is observed as a narrow tailward stream, comin…
High-resolution X-ray spectroscopy of θ Carinae
Nazé, Y.; Rauw, G.
Context: The peculiar hot star θ Car in the open cluster IC 2602 is a blue straggler as well as a single-line binary with a short period (2.2d).
Aims: Its high-energy properties are not well known, though X-rays can provide useful constraints on the energetic processes at work in binaries as well as in peculiar, single objects.
Methods: We…
Cluster observations of O+ escape in the magnetotail due to shock compression effects during the initial phase of the magnetic storm on 17 August 2001
Zong, Q. -G.; Reme, H.; Korth, A. +5 more
We study the O+ outflow into the magnetotail during the initial phase of the 17 August 2001 magnetic storm. Solar wind and magnetospheric data are used from instruments onboard ACE, WIND, and Cluster spacecraft. The interplanetary shock arrival at Earth caused a large compression of the magnetosphere. During this event, the Cluster spac…
A New Orbit Determination for Bright Sungrazing Comet of 1843
Sekanina, Zdenek; Chodas, Paul W.
Given the critical role of the bright sungrazer C/1843 D1, also called the Great March Comet of 1843, in hypotheses of the origin and evolution of the Kreutz system, a new orbital investigation of this comet was desirable. Closely inspecting Kreutz's classical work, we conclude that his result of 512 yr for the orbital period, which has been endle…
Optical properties of aerosols in Titan's atmosphere
Keller, H. U.; Rodin, A. V.; Skorov, Yu. V.
In the frame of fractal modeling of tholin aggregates we made a systematic analysis of their optical properties. Ballistic particle-cluster aggregation (BPCA) and diffusion-limited aggregation (DLA) of spherical primary particles (monomers) identical in material composition were considered. Aggregates composed of identical particles (monodisperse …