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Asymmetries in Mars' Exosphere. Implications for X-ray and ENA Imaging
Holmström, Mats
Observations and simulations show that Mars' atmosphere has large seasonal variations. Total atmospheric density can have an order of magnitude latitudinal variation at exobase heights. By numerical simulations we show that these latitude variations in exobase parameters induce asymmetries in the hydrogen exosphere that propagate to large distance…
Morphology of Spitzer 24 µm Detected Galaxies in the UDF: The Links between Star Formation and Galaxy Morphology
Le Floc'h, E.; Papovich, C.; Rieke, G. H. +2 more
We have studied the morphologies of infrared-luminous galaxies at 0.3<=z<1.4 in the HST Ultra Deep Field (UDF) by calculating concentration and asymmetry indices and comparing the results with similar calculations for: (1) galaxies at similar redshift that are less infrared-active, and (2) local luminous infrared galaxies [LIRGs; LIR
Mapping of the icy Saturnian satellites: First results from Cassini-ISS
Scholten, F.; Matz, K. -D.; Neukum, G. +7 more
Images of the icy Saturnian satellites Mimas, Enceladus, Tethys, Dione, Rhea, Iapetus, and Phoebe, derived by the Voyager and Cassini cameras are used to produce new local high-resolution image mosaics as well as global mosaics [ http://ciclops.org, http://photojournal.jpl.nasa.gov]. These global mosaics are valuable both for scientific interpreta…
Slow halo CMEs with shock signatures
Pohjolainen, S.; Lehtinen, N. J.
Context: .In the solar corona, shocks are formed when the speed of a disturbance exceeds the local magnetosonic speed. In the active region corona the Alfvén speed can drop to a few hundred km s-1, but globally it is much higher. There has been a long debate on whether the shocks responsible for type II bursts are created by bow shocks …
GRB 030406 - an extremely hard burst outside of the INTEGRAL field of view
Goldoni, P.; Rau, A.; Bulik, T. +3 more
Using the IBIS Compton mode, the INTEGRAL satellite is able to detect and localize bright and hard GRBs, which happen outside of the nominal INTEGRAL field of view. We have developed a method of analyzing such INTEGRAL data to obtain the burst location and spectra. We present the results for the case of
An Infrared Imaging Study of the Bipolar Proto-Planetary Nebula IRAS 16594-4656
Volk, Kevin; Kwok, Sun; Hrivnak, Bruce J. +1 more
High-resolution mid-infrared images have been obtained in N and Q band for the proto-planetary nebula IRAS 16594-4656. A bright equatorial torus and a pair of bipolar lobes can clearly be seen in the infrared images. The torus appears thinner at the center than at the edges, suggesting that it is viewed nearly edge-on. The infrared lobes correspon…
Substorm topology in the ionosphere and magnetosphere during a flux rope event in the magnetotail
Balogh, A.; Nakamura, R.; Rème, H. +4 more
On 13 August 2002, at ~23:00 UT, about 10 min after a substorm intensification, Cluster observes a flux rope in the central magnetotail, followed by a localised fast flow event about oneminute later. Associated with the flux rope event, a traveling compression region (TCR) is seen by those Cluster spacecraft which reside in the lobe. In the conjug…
Low mass pre-main sequence stars in the Large Magellanic Cloud
Panagia, N.; Romaniello, M.; Blanco, C. +2 more
As a part of an ongoing effort to characterise the young stellar populations in the Large Magellanic Cloud, we present HST-WFPC2 broad and narrow band imaging of two fields with recent star formation activity in the Tarantula region. A population of objects with Hα and/or Balmer continuum excess was identified. On account of the intense Hα emissio…
Macrospicules and blinkers as seen in Shutterless EIT 304 Å
Doyle, J. G.; Madjarska, M. S.; Hochedez, J. -F. +1 more
Aims.Small-scale transient phenomena in the solar atmosphere are believed to play a crucial role in the coronal heating and solar wind generation. This study aims at providing new observational evidence on blinkers and macrospicules appearance in imager data and in doing so, establish the long disputed relationship between these phenomena.
Met…
Spatial and Temporal Scales of Coronal Magnetic Restructuring in the Development of Coronal Mass Ejections
Wen, Yayuan; Wang, Jingxiu; Zhao, Hui +3 more
It has been commonly accepted that coronal mass ejections (CMEs) result from the restructuring or reconfiguring of large-scale coronal magnetic fields. In this paper, we analyzed four CME events using Nançay Radioheliograph (NRH) images and the experiments onboard the Solar and Heliospheric Observatory (SOHO) spacecraft to understand the coronal r…