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On the classification of ultra-compact nuclear rings
Beckman, John E.; Comerón, Sébastien; Knapen, Johan H.
Ultra-compact nuclear rings (UCNRs) can be defined as those galactic circumnuclear rings with a radius inferior to 200 parsecs [1]. Because very high spatial resolution is needed, this population has not been studied systematically until now. One important issue that has to be solved is whether UCNRs have an origin similar to larger circumnuclear …
Low-frequency fluctuations in the magnetosheath: Double Star TC-1 and Cluster observations
Zhang, TieLong; Du, Jian; Wang, Chi +1 more
The magnetic field variations are analyzed in the range of time periods from 4 s to 240 s in the magnetosheath observed by the Double Star TC-1 and Cluster in 2004. The characteristics of the magnetic field fluctuations are strongly controlled by the angle between the upstream interplanetary magnetic field (IMF) and the normal of the bow shock. Ge…
The pulsations of the B5IVe star HD181231 revealed by CoRoT
Neiner, C.; Janot-Pacheco, E.; Floquet, M. +12 more
We present the first results of the analysis of the light curve of the B5IVe star HD 181231 obtained during a long run (5 months) of the CoRoT mission. The light curve shows clear pulsations and even beating effects. Several frequencies are detected. Ground-based spec- troscopic data have also been analyzed and help to determine the rotation frequ…
Latitude-time distribution of the solar magnetic fields from 1975 to 2006
Minarovjech, M.
This paper presents the solar magnetic field distribution and meridional migration for the period of 1975-2006. A magnetic field latitude-time distribution map covering a 32-year period has been investigated. For this purpose a modified latitude-time diagram of the solar magnetic field distribution containing different kinds of fine structures is …
The Saturn system's icy satellites: New results from Cassini
Buratti, B. J.; Hendrix, A. R.; Lopes, R. M. C.
Are there Kronian electrons in the inner heliosphere?
Fichtner, H.; Lange, D.
Context: As the largest in our solar system the Jovian magnetosphere is treated in the literature as the dominant source of a few-MeV electrons, which have been measured by various spacecraft. In particular, observations obtained with Ulysses have significantly broadened the available data base.
Aims: We simulated the transports of MeV electro…
INTEGRAL and Swift Observations of Blazars in Outburst
Ghisellini, G.; Pian, E.; Foschini, L.
The blazars 3C 454.3, PKS 0537-441 and PKS 2155-304 are traditionally known to be among the most active sources of this class. They emit at all frequencies, up to gamma-rays, and are good probes of multiwavelength nuclear variability. The first two also have luminous broad emission line regions. We have recently monitored them with various facilit…
Soft Gamma Repeaters: New Results and Surprises from Swift, INTEGRAL, and the Interplanetary Network
Hurley, K.
The history and observational properties of the soft gamma repeaters are reviewed. Over the past decades, we have gone from viewing these objects as a special class of cosmic gamma-ray burst, to seeing them as one manifestation of magnetars. There is now a solid body of multi-wavelength observations, as well as some more controversial properties. …
Non-thermal particle effects on the Hα and Hβ line profiles in the 18 August 2002 solar flare
Kashapova, L. K.; Kotrč, P.; Kupryakov, Yu. A.
We present results of the 18 August 2002 flare analysis as an example for developing a diagnostic tool for thermal and non-thermal processes in chromospheric lines. Taking into account the hard X-ray (HXR) emission, we attempted to derive the Hα and Hβ line properties which were caused by the non-thermal electron contribution and could be useful f…
A comparison of Neutral Atom Detector Unit neutral atom image inversion with a comprehensive ring current model
Barabash, S.; Liu, Z. X.; Tang, C. L. +4 more
We present energetic neutral atom (ENA) images in the energy range 45 to 50 keV for H and 92 to 138 keV for O measured by the Neutral Atom Detector Unit (NUADU) onboard Double Star TC-2 during a geomagnetic storm on 8 May 2005. We compare the ion fluxes deduced from inversion of the NUADU image with those calculated using the Comprehensive Ring Cu…