Search Publications
The Discovery of an X-Ray/UV Stellar Flare from the Late-K/Early-M Dwarf LMC 335
Pun, C. S. J.; Kong, A. K. H.; Di Stefano, R. +2 more
We report the discovery of an X-ray/UV stellar flare from the source LMC 335, captured by XMM-Newton in the field of the Large Magellanic Cloud. The flare event was recorded continuously in X-ray for its first 10 hr from the precursor to the late decay phases. The observed fluxes increased by more than two orders of magnitude at its peak in X-ray …
Multispacecraft observations of the terrestrial bow shock and magnetopause during extreme solar wind disturbances
Erdös, G.; Vennerstrom, S.; Tátrallyay, M. +2 more
Three events are discussed from the declining phase of the last solar cycle when the magnetopause and/or the bow shock were observed unusually close to the Earth due to major interplanetary disturbances. The observed extreme locations of the discontinuities are compared with the predictions of three magnetopause and four bow shock models which des…
Multi-spacecraft observations of small-scale fluctuations in density and fields in plasmaspheric plumes
Mouikis, C. G.; Khotyaintsev, Yu. V.; Torbert, R. B. +6 more
In this event study, small-scale fluctuations in plasmaspheric plumes with time scales of ~10 s to minutes in the spacecraft frame are examined. In one event, plasmaspheric plumes are observed by Cluster, while IMAGE measured density enhancement at a similar location. Fluctuations in density exist in plumes as detected by Cluster and are accompani…
Application of electrical propulsion for an active debris removal system: a system engineering approach
Covello, Fabio
One of the main challenge in the design of an active removal system for space debris is the high ΔV required both to approach space debris lying in different orbits and to de-orbit/re-orbit them. Indeed if the system does not target a number of objects during its lifetime the cost of the removal will be far too high to be considered as the basis o…
Different Bz response regions in the nightside magnetosphere after the arrival of an interplanetary shock: Multipoint observations compared with MHD simulations
Wang, C.; Wang, Y.; Sun, T. R.
We present different magnetic field changes in the nightside magnetosphere in response to the interplanetary (IP) shock on 17 December 2007, using multiple spacecraft observations and global MHD simulations. The coexistence of two distinct Bz response regions in the nightside magnetosphere in a single event has been observationally iden…
UCAC3 Proper Motion Survey. II. Discovery of New Proper Motion Stars in UCAC3 with 0farcs40 yr-1 > µ >= 0farcs18 yr-1 between Declinations -47° and 00°
Henry, Todd J.; Finch, Charlie T.; Hambly, Nigel C. +2 more
We present 474 new proper motion stellar systems in the southern sky having no previously known components, with 0farcs40 yr-1 >µ >= 0farcs18 yr-1 between declinations -47° and 0°. In this second paper utilizing the U.S. Naval Observatory third CCD Astrograph Catalog (UCAC3) we complete our sweep of the southern s…
A New Ultraluminous X-Ray Source in the nearby Edge-on Spiral NGC 891
Bregman, Joel N.; Miller, Jon M.; Hodges-Kluck, Edmund J. +1 more
We report the discovery of a new candidate ultraluminous X-ray source in the nearby edge-on spiral galaxy NGC 891. The source, which has an absorbed flux of Fx ~ 1 × 10-12 erg s cm-2 (corresponding to an Lx >~ 1040 erg s-1 at 9 Mpc), must have begun its outburst in the past five …
First observation of the Venus UV dayglow at limb from SPICAV/VEX
Bertaux, Jean-Loup; Chaufray, Jean-Yves; Leblanc, Francois
We present the first limb observations of the dayglow emissions by the UV channel of SPICAV aboard Venus Express between October and December 2011. The CO Cameron bands between 180-260 nm and CO2+ doublet at 289 nm are clearly identified for the first time in the Venusian dayglow. The Cameron bands brightness peaks at 137.5 ±…
Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp
Yeoman, T. K.; Wright, D. M.; Kim, H. +3 more
Pc3 pulsations (frequency ∼20-100 mHz) which originate in the ion foreshock upstream of the Earth's bow shock due to the interaction between reflected ions and the solar wind are frequently observed in ground-based pulsation magnetometer data. Previous studies have noted increased Pc3 wave power in the vicinity of the dayside cusp and inferred tha…
Solar Stereoscopy with STEREO/EUVI A and B Spacecraft from Small (6∘) to Large (170∘) Spacecraft Separation Angles
Aschwanden, Markus J.; Nitta, Nariaki; Lemen, James +1 more
We performed for the first time stereoscopic triangulation of coronal loops in active regions over the entire range of spacecraft separation angles (αsep≈6∘,43∘,89∘,127∘,and 170∘). The accuracy of stereoscopic correlation depends mostly on the viewing angle with respect to the solar…