4 edition of Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF found in the catalog.
Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF
by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va
Written in English
|Statement||J.R. Gillis ... [et al.].|
|Series||NASA contractor report -- 198191., NASA contractor report -- NASA CR-198191.|
|Contributions||Gillis, J. R., Langley Research Center.|
|The Physical Object|
1 Introduction. Atomic oxygen (O) is the critical species in the chemistry and energetics of the mesosphere and lower thermosphere (MLT). Formed by photolysis of molecular oxygen, it carries substantial amounts of chemical potential energy, which is released during exothermic chemical reactions, resulting in large chemical heating rates throughout the MLT (Mlynczak & Solomon, Cited by: Start studying analytical review. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
In the upper atmosphere, solar radiation dissociates O2, resulting in relatively large atomic oxygen densities above 80 km, with a peak near 95 km, and increasing dominance compared to other species with increasing altitude; above ~ km, atomic oxygen [O(3P)] is . On J , the Progress cargo spacecraft 56P was launched from Baikonur to the International Space Station (ISS), carrying EXPOSE-R2, the third ESA (European Space Agency) EXPOSE facility, the second EXPOSE on the outside platform of the Russian Zvezda module, with four international astrobiological experiments into space. More than Cited by:
sion rate using atomic oxygen density as a vari ab le parameter in the model for a number of cases al different g~ographical local ions and local times in both hemispheres. Th is factor can be incorporated in MSIS model quite easily to obtain more precise values of atomic oxygen densily between 92 and km. 1 Introduction. Publication orders (printed book): [email protected] Abstract Aalto University, P.O. Box , FI Aalto Author Laura Oikkonen Name of the doctoral dissertation Atomic-scale defects in solar cell material CuInSe2 from hybrid-functional calculations Publisher School of Science Unit Department of Applied Physics.
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Get this from a library. Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF. [J R Gillis; Langley Research Center.;]. Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF.
By R. Bourassa, P. Gruenbaum, H. Pippin and J. Gillis. Abstract. Atomic oxygen (AO) fluences and solar exposure have been modeled for selected hardware from the Long Duration Exposure Facility (LDEF). The atomic oxygen exposure was modeled.
MATERIAL SELECTION GUIDELINES TO LIMIT ATOMIC OXYGEN EFFECTS ON SPACECRAFT SURFACES 1. PURPOSE This document provides guidelines in selecting materials for satellites and space platforms, de-signed to operate within the low-Earth orbit (LEO) environment, which limit the effects of atomic oxygen (AO) interactions with spacecraft Size: 2MB.
Pippin's 4 research works with 29 reads, including: Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF. Although the Long Duration Exposure Facility (LDEF) had exposed materials with a fixed orientation relative to the ambient low-Earth-orbital environment, arrival of atomic oxygen is angularly distributed as a result of the atomic oxygen's high temperature Maxwellian velocity distribution and the LDEF's orbital inclination.
The recently discovered fast hydroxyl‐atomic oxygen relaxation mechanism provided new insight into the mesospheric emission formation. Using a new hydroxyl (OH) model and retrieval algorithm, we obtained atomic oxygen concentration in the nighttime mesosphere and lower thermosphere (MLT) from the SABER OH by: 7.
Calculated values of atomic oxygen fluences and solar exposure on selected surfaces of LDEF. September have been modeled for selected hardware from the Long Duration Exposure Facility.
The most well-characterized atomic oxygen erosion yield is that of polyimide Kapton® H, which has an erosion yield of ×10 −24 cm 3 /atom for LEO eV atomic oxygen. 12,13 Table (14,15,16) lists the atomic oxygen erosion yields of a wide variety of polymers, where many of the values were measured from space experiments and others.
NASA Images Solar System Collection Ames Research Center. Brooklyn Museum. Full text of "LDEF: 69 Months in Space. Third Post-Retrieval Symposium, part 2". The highest VUV fluences were equivalent sun hours (ESH) on LDEF space-end experiment trays, with intermediate values of 1 1 ESH on leading and trailing edge trays and to ESH on side trays.
CHAPTER 23 DEGRADATION OF SPACECRAFT MATERIALS Joyce Dever Bruce Banks Kim de Groh Sharon Miller NASA Glenn Research Center, Cleveland, Ohio INTRODUCTION ATOMIC OXYGEN EFFECTS CONTAMINATION EFFECTS SPACE RADIATION EFFECTS THERMAL AND THERMAL CYCLING EFFECTS INTRODUCTION Materials used on exterior spacecraft surfaces Cited by: Full text of "Modeling of Transmittance Degradation Caused by Optical Surface Contamination by Atomic Oxygen Reaction with Adsorbed Silicones" See other formats NASA/TM— W^, Modeling of Transmittance Degradation Caused by Optical Surface Contamination by Atomic Oxygen Reaction With Adsorbed Silicones Aaron Snyder, Bruce Banks, and Sharon.
The third Effects of Oxygen Atom Interaction with Materials (EOIM 3) experiment flew on STS from July 31 to August 8, The EOIM-3 sample tray was exposed to the low-earth orbit space environment for hours at an altitude of nautical miles resulting in a calculated total atomic.
We acknowledge the technical support of Professor Steinfeld’s lab at ETH Zurich for providing the solar optics and engineering design of the high-flux solar simulator and also wish to thank Elizabeth Seaford, Clayton Nguyen, Matthew Golob, Ryan Knott, and Dr.
Sheldon Jeter for their assistance with fabricating and calibrating the by: SPIE Digital Library Proceedings. Proc. SPIEDamage to Space Optics, and Properties and Characteristics of Optical Glass, pg (11 January ); doi: / Abstract.
Rates of production of O(1 D) atoms in the upper atmosphere by photodissociation of O 2, dissociative recombination of O 2 +, NO + and electron impact excitation of O(3 P) have been calculated for low, medium and high levels of solar ions with solar activity, of neutral and ionic composition, electron and neutral temperatures of the upper atmosphere and solar Cited by: 2.
Cross sectional analysis shows atomic oxygen (AO) erosion values of up to m m (1 mil). Greater occurrences of through-thickness cracking and surface microscopy were observed in areas of high solar exposure. Atomic force microscopy (AFM) showed increases in surface microhardeness measurements with increasing solar exposure.
We review the development of dust science from the first ground-based astronomical observations of dust in space to compositional analysis of individual dust particles and their source objects. A multitude of observational techniques is available for the scientific study of space dust: from meteors and interplanetary dust particles collected in the upper Author: Eberhard Grün, Eberhard Grün, Harald Krüger, Ralf Srama.
Proc. SPIERough Surface Scattering and Contamination, pg 4 (25 October ); doi: / To investigate the difference of surface oxygen element and oxygen-containing functional groups among coal dusts with different metamorphic degrees and their influence on surface wettability, a series of X-ray photoelectron spectroscopy experiments on 6 Cited by:.
Long Duration Exposure Facility (LDEF) Experiment M Meteoroid and Debris Survey. P. in NASA Conference PublicationProceedings of the Second LDEF Post-Retrieval Symposium, A.S. Levine, ed. Hampton, Virginia: NASA Langley Research Center.A laser induced periodic surface structure (LIPSS) on graphene doped polystyrene was prepared by the means of a krypton fluoride (KrF) laser with the wavelength of nm and precisely desired physico-chemical properties were obtained for the structure.
Surface morphology after laser modification of polystyrene (PS) doped with graphene nanoplatelets (GNP) was by: 1.expressed as a change in incoming solar radiation at 65 N). For past solar activity changes, the most recent reconstruc-tion of total solar irradiance (TSI) based on measurements of the cosmogenic isotope 10Be in ice cores (Steinhilber et al., ) indicate a possible coherence with the δ18O values of BU4 during LIA (Fig.