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Propagation and Interaction Properties of Successive Coronal Mass Ejections in Relation to a Complex Type II Radio Burst
Liu, Ying D.; Zhao, Xiaowei; Zhu, Bei
We examine the propagation and interaction properties of three successive coronal mass ejections (CMEs) from 2001 November 21-22, with a focus on their connection with the behaviors of the associated long-duration complex type II radio burst. In combination with coronagraph and multi-point in situ observations, the long-duration type II burst prov…
Influence of the Ambient Electric Field on Measurements of the Actively Controlled Spacecraft Potential by MMS
Andriopoulou, M.; Nakamura, R.; Torbert, R. B. +5 more
Space missions with sophisticated plasma instrumentation such as Magnetospheric Multiscale, which employs four satellites to explore near-Earth space benefit from a low electric potential of the spacecraft, to improve the plasma measurements and therefore carry instruments to actively control the potential by means of ion beams. Without control, t…
Infrared polarimetry of Mrk 231: scattering off hot dust grains in the central core
Siebenmorgen, R.; Telesco, C. M.; Packham, C. +13 more
We present high-angular (0.17-0.35 arcsec) resolution imaging polarimetric observations of Mrk 231 in the 3.1 µm filter using MMT-Pol on the 6.5-m MMT, and in the 8.7, 10.3, and 11.6 µm filters using CanariCam on the 10.4-m Gran Telescopio CANARIAS. In combination with already published observations, we compile the 1-12 µm total …
Modeling a Propagating Sawtooth Flare Ribbon Structure as a Tearing Mode in the Presence of Velocity Shear
Longcope, Dana; Parker, Jacob
On 2014 April 18 (SOL2014-04-18T13:03), an M-class flare was observed by IRIS. The associated flare ribbon contained a quasi-periodic sawtooth pattern that was observed to propagate along the ribbon, perpendicular to the IRIS spectral slit, with a phase velocity of ∼15 km s-1. This motion resulted in periodicities in both intensity and …
Diurnal observations of HCl altitude variation in the 70-100 km mesosphere of Venus
Todd Clancy, R.; Sandor, Brad J.
First submm spectroscopic observations of the 625.9 GHz H35Cl absorption lines of the Venus dayside atmosphere were obtained with the James Clerk Maxwell Telescope (JCMT) on March 2, 2013. These data, which support retrieval of HCl altitude distributions in the Venus mesosphere (70-100 km), are presented here and compared with previousl…
Chandra X-ray observations of the hyper-luminous infrared galaxy IRAS F15307+3252
Iwasawa, K.; Fabian, A. C.; Gandhi, P. +6 more
Hyper-luminous infrared galaxies (HyLIRGs) lie at the extreme luminosity end of the IR galaxy population with LIR > 1013 L⊙. They are thought to be closer counterparts of the more distant sub-millimeter galaxies, and should therefore be optimal targets to study the most massive systems in formation. We present d…
Surface thermophysical properties on the potentially hazardous asteroid (99942) Apophis
Ip, Wing-Huen; Yu, Liang-Liang; Ji, Jianghui
We investigate the surface thermophysical properties (thermal emissivity, thermal inertia, roughness fraction and geometric albedo) of asteroid (99942) Apophis, using the currently available mid-infrared observations from CanariCam on Gran Telescopio CANARIAS and far-infrared data from PACS on Herschel, based on the Advanced Thermophysical Model. …
Testing for Shock-heated X-Ray Gas around Compact Steep Spectrum Radio Galaxies
Worrall, D. M.; O'Dea, C. P.; Clarke, T. E. +7 more
We present Chandra and XMM-Newton X-ray, Very Large Array (VLA) radio, and optical observations of three candidate compact steep spectrum (CSS) radio galaxies. CSS sources are of a galactic scale and are presumably driving a shock through the interstellar medium (ISM) of their host galaxy. B3 1445+410 is a low-excitation emission line CSS radio ga…
Spectral Evidence for an Inner Carbon-rich Circumstellar Belt in the Young HD 36546 A-star System
Melis, C.; Sitko, M. L.; Marengo, M. +5 more
Using the NASA/IRTF SpeX and BASS spectrometers we have obtained 0.7-13 µm observations of the newly imaged 3-10 Myr old HD 36546 disk system. The SpeX spectrum is most consistent with the photospheric emission expected from an L * ∼ 20 L ⊙, solar abundance A1.5V star with little to no extinction, and excess emission fr…
Clastic patterned ground in Lomonosov crater, Mars: examining fracture controlled formation mechanisms
Balme, Matthew R.; Patel, Manish R.; Hagermann, Axel +1 more
The area surrounding Lomonosov crater on Mars has a high density of seemingly organised boulder patterns. These form seemingly sorted polygons and stripes within kilometre scale blockfields, patches of boulder strewn ground which are common across the Martian high latitudes. Several hypotheses have been suggested to explain the formation of clasti…