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  • ASTROPHYSICS  (10)
  • Quality Assurance and Reliability  (1)
  • 1
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    Anatomy of a cluster IDP. Part 2: Noble gas abundances, trace element geochemistry, isotopic abundances, and trace organic chemistry of several fragments from L2008#5 (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The topics discussed include the following: noble gas content and release temperatures; trace element abundances; heating summary of cluster fragments; isotopic measurements; and trace organic chemistry.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., The Twenty-Fifth Lunar and Planetary Science Conference. Part 3: P-Z; p 1391-1392
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Trace element abundance determinations by Synchrotron X Ray Fluorescence (SXRF) on returned comet nucleus mineral grains (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Trace element analyses were performed on bulk cosmic dust particles by Proton Induced X Ray Emission (PIXE) and Synchrotron X Ray Fluorescence (SXRF). When present at or near chondritic abundances the trace elements K, Ti, Cr, Mn, Cu, Zn, Ga, Ge, Se, and Br are presently detectable by SXRF in particles of 20 micron diameter. Improvements to the SXRF analysis facility at the National Synchrotron Light Source presently underway should increase the range of detectable elements and permit the analysis of smaller samples. In addition the Advanced Photon Source will be commissioned at Argonne National Laboratory in 1995. This 7 to 8 GeV positron storage ring, specifically designed for high-energy undulator and wiggler insertion devices, will be an ideal source for an x ray microprobe with one micron spatial resolution and better than 100 ppb elemental sensitivity for most elements. Thus trace element analysis of individual micron-sized grains should be possible by the time of the comet nucleus sample return mission.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Workshop on Analysis of Returned Comet Nucleus Samples; p 20-21
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  • 3
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    The meteoritic contribution to the regoliths of Mars, Deimos, and Phobos (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The mass influx of meteoritic material at Earth exhibits two distinct peaks: one centered at 10-5 grams, corresponding to the continuous, planet-wide flux of micrometeorites, and a second corresponding to the rare impacts of objects larger than 1014 grams. Using the measured flux of meteoritic material at Earth and estimates of the Mars/Earth flux ration, it was calculated that the micrometeorites add between 2,700 and 59,000 tons of meteoritic material to the surface of Mars annually. This corresponds to the accretion of between 1.8 and 40 cm of meteoritic material per billion years. On the Moon this meteoritic component constitutes 1 to 2 percent of the mare soils. Depending on the indigenous regolith production rate on Mars, the meteoritic material on Mars may be present in sufficient concentration to serve as a resource for the volatile and siderophile elements common in chondritic meteorites but rare in basaltic crustal material. Since a significant fraction of the micrometeorites less than 1200 mm in diameter survive atmospheric entry on Mars without melting, they carry into the regolith the solar wind ions, including H, He, and noble gases, implanted during their space exposure.
    Keywords: ASTROPHYSICS
    Type: Arizona Univ., Resources of Near-Earth Space: Abstracts; p 29
    Format: text
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  • 4
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    Stardust Wild 2: Sample Processing (2006)
    In:  Other Sources
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    Publication Date: 2018-06-11
    Description: No abstract available
    Keywords: Quality Assurance and Reliability
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  • 5
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    Depletions of sulfur and/or zinc in IDPs: Are they reliable indicators of atmospheric entry heating? (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The degree of heating of interplanetary dust particles (IDP's) on Earth atmospheric entry is important in distinguishing cometary particles from main-belt asteroidal particles. Depletions in the volatile elements S and Zn were proposed as chemical indicators of significant entry heating. The S and Zn contents of cosmic dust particles were correlated with physical indicators of atmospheric entry heating, such as the production of magnetite and the loss of solar wind implanted He. The results indicate that the Zn content of IDP's is a useful indicator of entry heating, but the S content seems to be less useful.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 497-498
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  • 6
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    Trace element content of chondritic cosmic dust: Volatile enrichments, thermal alterations, and the possibility of contamination (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Trace element abundances in 51 chondritic Interplanetary Dust Particles (IDP's) were measured by Synchrotron X-Ray Fluorescence (SXRF). The data allow us to determine an average composition of chondritic IDP's and to examine the questions of volatile loss during the heating pulse experienced on atmospheric entry and possible element addition due to contamination during atmospheric entry, stratospheric residence, and curation.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 495-496
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  • 7
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    New low-Ni (igneous?) particles among the C and C? types of cosmic dust (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Low-Ni particles with major element abundances, optical properties, and morphologies sufficiently similar to chondritic interplanetery dust particles (IDP's) to receive JSC Cosmic Dust Catalog classifications of C or C?-types were shown to have trace element contents and mineralogies similar to igneous material. Examination of the JSC Catalog EDX spectra by Cooke et al. has shown that 13 percent of the C-type and 38 percent of the C?-type particles are potentially low-Ni particles. Two new low-Ni particles were identified, and it was shown that an additional fragment from the L2002*C cluster has an igneous composition. A newly analyzed fragment of the W7066*A cluster has a chondritic composition. The W7066*A cluster is important because it has yielded a fragment of igneous composition and another fragment having high concentrations of He and Ne suggesting an extraterrestrial origin.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 499-500
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  • 8
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    Interplanetary dust collected in the earth's stratosphere - The question of solar flare tracks (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The negative result of a transmission electron microscope (TEM) search for solar flare tracks in 10 micron interplanetary dust particles (Flynn et al., 1978) which have been collected in the earth's stratosphere with a program of sampling initiated by Brownlee et al. (1976) has been reported previously. In this paper, it is shown that silicates in the particles record laboratory iron-ion tracks which are detectable in the TEM. The absence of tracks in the silicates could be due to track annealing on atmospheric entry, and may indicate a particle emissivity below 0.3, or that many of the particles broke up on encounter with the atmosphere. Alternatively, the lifetime of 10 micron dust particles at 1 AU could be shorter than that given by previous estimates.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
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  • 9
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    Atmospheric entry heating of micrometeorites (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A computer simulation of the atmospheric entry deceleration and heating of cosmic dust particles has been developed and the predicted peak temperatures are compared to the earlier closed-form mathematical solutions of Whipple (195) and Fraundorf (1980). A 20-micron diameter particle of density 1 gm/cu cm having a velocity of 10 km/s at infinity and entering the atmosphere at normal incidence reaches a peak temperature of 1159 K. The duration of the heating pulse is about 8 s but the particle remains within 100 K of the peak temperature for only 1.0 s. As the angle of incidence decreases, the peak temperature reached on entry also decreases, and the duration of the temperature pulse increases. Comparison with the Whipple amd Fraundorf models indicates that they accurately assess the entry heating for cosmic dust particles of moderate or higher densities and entry angles near normal incidence. As particle density decreases or the entry angle nears grazing incidence, they overestimate the peak temperature.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Science Conference; Mar 14, 1988 - Mar 18, 1988; Houston, TX; United States
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  • 10
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    The near-earth enhancement of asteroidal over cometary dust (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The study deals with a theory suggesting a cometary origin for most of the stratospheric cosmic dust. It is argued, though, that the stratospheric cosmic dust, as well as dust sampled by earth-orbiting collectors, is not representative of the true composition of the zodiacal cloud. A substantial near-earth collection bias enhances the low-velocity component in stratospheric and earth-orbiting collectors. This arises from gravitational focusing, which substantially biases all near-earth micrometeorite collections in favor of the low-velocity component of the interplanetary dust, and atmospheric entry heating, which further biases the stratospheric cosmic dust in favor of the low-velocity component of the interplanetary dust. It is noted that, in addition to these two effects, the increasing collision probability between a dust particle and a nongravitating planet will bias the near-earth collection farther in favor of dust with lower geocentric velocity at the collection opportunity.
    Keywords: ASTROPHYSICS
    Type: Lunar and Planetary Science Conference; Mar 13, 1989 - Mar 17, 1989; Houston, TX; United States
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