scholarly journals Resolving Io’s Volcanoes from a Mutual Event Observation at the Large Binocular Telescope

2021 ◽  
Vol 2 (6) ◽  
pp. 227
Author(s):  
Katherine de Kleer ◽  
Michael Skrutskie ◽  
Jarron Leisenring ◽  
Ashley G. Davies ◽  
Al Conrad ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Temporal Evolution ◽  
Light Curves ◽  
Lava Flows ◽  
Volcanic Center ◽  
Active Volcanism ◽  
Geological Processes ◽  
Areal Coverage

Abstract Unraveling the geological processes ongoing at Io’s numerous sites of active volcanism requires high spatial resolution to, for example, measure the areal coverage of lava flows or identify the presence of multiple emitting regions within a single volcanic center. In de Kleer et al. (2017) we described observations with the Large Binocular Telescope during an occultation of Io by Europa at ∼6:17 UT on 2015 March 8 and presented a map of the temperature distribution within Loki Patera derived from these data. Here we present emission maps of three other volcanic centers derived from the same observation: Pillan Patera, Kurdalagon Patera, and the vicinity of Ulgen Patera/PV59/N Lerna Regio. The emission is localized by the light curves and resolved into multiple distinct emitting regions in two of the cases. Both Pillan and Kurdalagon Paterae had undergone eruptions in the months prior to our observations, and the location and intensity of the emission are interpreted in the context of the temporal evolution of these eruptions observed from other facilities. The emission from Kurdalagon Patera is resolved into two distinct emitting regions separated by only a few degrees in latitude that were unresolved by Keck observations from the same month.

scholarly journals High Spatial Resolution Observations of the 1998 and 1999 Leonid Meteors

2001 ◽  
Vol 183 ◽  
pp. 279-280
Author(s):  
X.J. Jiang ◽  
J.Y. Hu
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Light Curves ◽  
Leonid Meteors ◽  
Meteor Storm

AbstractWe observed the Leonid meteor storm in 1998 and 1999. The light curves extracted from the 2-dimensional images of the bright Leonid meteors clearly show the sub-structures, which are consistent with the generally accepted dustball meteor model (Hawkes & Jones, 1975).

scholarly journals Polygonal terrains on Mars

Finisterra ◽  
2012 ◽  
Vol 44 (87) ◽  
Author(s):  
José Saraiva ◽  
Lourenço Bandeira ◽  
Joana Antunes ◽  
Pedro Pina ◽  
Teresa Barata
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Temporal Evolution ◽  
Small Scale ◽  
Automated Identification ◽  
Research Project ◽  
Water Ice ◽  
Full Characterization

The presence of water ice on mars is well established. Some features on the planet point to the occurrence of processes similar to those that take place in periglacial areas of Earth. one of the clues for this is the existence of small-scale polygonal terrains. In this paper, we present a methodology that aims at the automated identification of polygonal patterns on high-spatial resolution images of the surface of mars. In the context of the research project TERpolI, this step will be complemented with a full characterization, in both geometric and topological terms, of the networks detected. In this manner, we hope to collect data that will lead to a better understanding of the conditions of formation of the polygons, and of their temporal evolution; namely, we intend to identify different groups of polygons and to compare them with terrestrial examples.

Visualising active volcanism with high spatial resolution satellite data: the 1991-1993 eruption of Mount Etna

2000 ◽  
Vol 62 (4-5) ◽  
pp. 256-265 ◽  
Author(s):  
Robert Wright ◽  
David A. Rothery ◽  
Stephen Blake ◽  
David C. Pieri
Keyword(s):  
Spatial Resolution ◽  
Satellite Data ◽  
High Spatial Resolution ◽  
Mount Etna ◽  
Active Volcanism

scholarly journals High spatial resolution monitoring of the activity of BA supergiant winds

2010 ◽  
Vol 6 (S272) ◽  
pp. 342-347
Author(s):  
Olivier Chesneau ◽  
Luc Dessart ◽  
Andreas Kaufer ◽  
Denis Mourard ◽  
Otmar Stahl ◽  
...  
Keyword(s):  
Spatial Structure ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Temporal Evolution ◽  
Optical Interferometry ◽  
Wind Activity ◽  
Better Than

AbstractThere are currently two optical interferometry recombiners that can provide spectral resolutions better than 10000, AMBER/VLTI operating in the H-K bands, and VEGA/CHARA, recently commissioned, operating in the visible. These instruments are well suited to study the wind activity of the brightest AB supergiants in our vicinity, in lines such as Hα or Brγ. We present here the first observations of this kind, performed on Rigel (B8Ia) and Deneb (A2Ia). Rigel was monitored by AMBER in two campaigns, in 2006-2007 and 2009-2010, and observed in 2009 by VEGA; whereas Deneb was monitored in 2008-2009 by VEGA. The extension of the Hα and Brγ line forming regions were accurately measured and compared with CMFGEN models of both stars. Moreover, clear signs of activity were observed in the differential visibility and phases. These pioneer observations are still limited, but show the path for a better understanding of the spatial structure and temporal evolution of localized ejections using optical interferometry.

Analysis of the Front Facet Temperature in Laser Diode With Non Absorbing Mirror

2005 ◽  
Vol 891 ◽  
Author(s):  
Tomasz Jan Ochalski ◽  
Dorota Pierscinska ◽  
Andrzej Malag
Keyword(s):  
Temperature Distribution ◽  
Spatial Resolution ◽  
Laser Diode ◽  
High Spatial Resolution ◽  
Laser Diodes ◽  
Optical Damage ◽  
Damage Level ◽  
Temperature Maps ◽  
Real Temperature ◽  
Front Facet

ABSTRACTNon-absorbing mirror (NAM) lasers, also known as window lasers, were developed to increase catastrophic optical damage level of the devices. In this work we present the analysis of the laser diodes (LD) front facet temperature distribution. Micro-thermoreflectance technique is used to perform a detailed temperature maps of the operating LDs. Such a technique gives us temperature maps with a high spatial resolution equal 0.6μm. We demonstrate micro thermoreflectance as a perfect tool to determine real temperature distribution of the operating laser diode front facet.

High spatial resolution AEM observations of yttrium segregation in chromia scales grown on Co-45%Cr

1986 ◽  
Vol 44 ◽  
pp. 518-519
Author(s):  
K. Przybylski ◽  
A. J. Garratt-Reed ◽  
G. J. Yurek
Keyword(s):  
Spatial Resolution ◽  
Outer Surface ◽  
Maximum Concentration ◽  
High Spatial Resolution ◽  
Reactive Elements ◽  
Chromia Scales

The addition of so-called “reactive” elements such as yttrium to alloys is known to enhance the protective nature of Cr2O3 or Al2O3 scales. However, the mechanism by which this enhancement is achieved remains unclear. An A.E.M. study has been performed of scales grown at 1000°C for 25 hr. in pure O2 on Co-45%Cr implanted at 70 keV with 2x1016 atoms/cm2 of yttrium. In the unoxidized alloys it was calculated that the maximum concentration of Y was 13.9 wt% at a depth of about 17 nm. SIMS results showed that in the scale the yttrium remained near the outer surface.

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

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