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Field-aligned currents and parallel electric field potential drops at Mars. Scaling from the Earth’ aurora
Woch, J.; Dubinin, E.; Fraenz, M. +1 more
The observations of electron inverted 'V' structures by the MGS and MEX spacecraft, their resemblance to similar events in the auroral regions of the Earth, and the discovery of strong localized magnetic field sources of the crustal origin on Mars, raised hypotheses on the existence of Martian aurora produced by electron acceleration in parallel e…
The ChaMP Extended Stellar Survey (ChESS): Photometric and Spectroscopic Properties of Serendipitously Detected Stellar X-Ray Sources
Silverman, J. D.; Covey, K. R.; Barkhouse, W. A. +9 more
We present 348 X-ray-emitting stars identified from correlating the Extended Chandra Multiwavelength Project (ChaMP), a wide-area serendipitous survey based on archival X-ray images, with the Sloan Digital Sky Survey (SDSS). We use morphological star/galaxy separation, matching to an SDSS quasar catalog, an optical color-magnitude cut, and X-ray d…
Enceladus: A potential source of ammonia products and molecular nitrogen for Saturn's magnetosphere
Johnson, R. E.; Sittler, E. C.; Smith, H. T. +5 more
The detection of nitrogen species in Saturn's magnetosphere could, in principle, provide clues to the origin and evolution of its satellites and tenuous rings. Smith et al. (2005) first identified low-energy N+ using the Cassini Plasma Spectrometer (CAPS). N+ was predominantly seen in the Saturn's inner magnetosphere (<∼14…
A Universal Decline Law of Classical Novae. III. GQ Muscae 1983
Cassatella, Angelo; Kato, Mariko; Hachisu, Izumi
We present a unified model of infrared (IR), optical, ultraviolet (UV), and X-ray light curves for the 1983 outburst of GQ Muscae (Nova Muscae 1983) and estimate its white dwarf (WD) mass. Based on an optically thick wind model of nova outbursts, we model the optical and IR light curves with free-free emission, and the UV 1455 Å and supersoft X-ra…
XMM-Newton X-ray spectra of the SNR 0509-67.5: data and models
Vink, J.; Kosenko, D.; Blinnikov, S. +1 more
Aims: We report on X-ray observations of the supernova remnant 0509-67.5 in the Large Magellanic Cloud acquired by the XMM-Newton X-ray observatory. We use the imaging spectroscopy (EPIC) and Reflective Grating Spectrometer (RGS) data to investigate properties of the remnant and its environment.
Methods: The X-ray spectra were analyzed with SP…
Star formation in the hosts of GHz peaked spectrum and compact steep spectrum radio galaxies
O'Dea, C. P.; Labiano, A.; Baum, S. A. +2 more
Aims:We are searching for star formation regions in the hosts of potentially young radio galaxies (gigahertz peaked spectrum and compact steep spectrum sources).
Methods: We used near-UV imaging with the Hubble Space Telescope Advanced Camera for Surveys.
Results: We find near-UV light could be the product of recent star formation in five …
Observations of Low-Latitude Coronal Plumes
Wang, Y. -M.; Muglach, K.
Using Fe IX/X 17.1 nm observations from the Extreme-Ultraviolet Imaging Telescope (EIT) on the Solar and Heliospheric Observatory (SOHO), we have identified many coronal plumes inside low-latitude coronal holes as they transited the solar limb during the late declining phase of cycle 23. These diffuse, linear features appear to be completely analo…
Deep Infrared Observations of the Puzzling Central X-Ray Source in RCW 103
Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +4 more
The object 1E 161348-5055 (1E 1613) is a pointlike, soft X-ray source shining at the center of the 2000 yr old supernova remnant (SNR) RCW 103. It features a puzzling 6.67 hr periodicity and dramatic variability over a timescale of a few years. This, coupled with a young age and the lack of an obvious optical counterpart, makes 1E 1613 a unique so…
Earth X-ray albedo for cosmic X-ray background radiation in the 1-1000 keV band
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +1 more
We present calculations of the reflection of the cosmic X-ray background (CXB) by the Earth's atmosphere in the 1-1000 keV energy range. The calculations include Compton scattering and X-ray fluorescent emission and are based on a realistic chemical composition of the atmosphere. Such calculations are relevant for CXB studies using the Earth as an…
Intermittency in the Photosphere and Corona above an Active Region
Wang, Haimin; Yurchyshyn, Vasyl; Abramenko, Valentyna
Recent studies have demonstrated without doubt that the magnetic field in the photosphere and corona is an intermittent structure, opening new views of the underlying physics. In particular, such problems as the existence in the corona of localized areas with extremely strong resistivity (required to explain magnetic reconnection at all scales) an…