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  • 1975-1979  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Interplanetary dust: are there two independent populations? (1978)
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 800-802 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] New data1-5 on lunar microcraters together with the review of Fechtig et al.6 have firmly established the following features of the cumulative size distribution function FC(DC) usually represented by a Dc-q power law: (1) a power index q = 3.5 for craters 〉100 µm; (2) a progressive decrease ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/276800a0
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Interplanetary dust: are there two independent populations? (1978)
    Springer Nature
    Details
    Publication Date: 1978-12-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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    PAPER CURRENT
  • 3
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    Radiation pressure and Poynting-Robertson drag for small spherical particles (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Robertson's expression for the velocity-dependent effect of solar radiation on the motion of small particles is difficult because of its dependence on relativistic considerations, and it is also deficient in that it assumes perfectly absorbing particles. The present paper gives a heuristic derivation of the Poynting-Robertson effect. Robertson's expression for perfectly absorbing particles is obtained but on a much simpler physical basis, and an expression is also obtained for a particle that in general scatters, transmits, and absorbs light. Some numerical results on the solar radiation forces felt by small particles of cosmochemically important compositions are given.
    Keywords: ASTROPHYSICS
    Type: International Colloquium; Aug 17, 1976 - Aug 20, 1976; Lyons; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Radiation forces on small particles in the solar system (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Solar radiation forces on small particles in the solar system are examined, and the resulting orbital evolution of interplanetary and circumplanetary dust is considered. An expression is derived for the effects of radiation pressure and Poynting-Robertson drag on small, spherical particles using the energy and momentum transformation laws of special relativity, and numerical examples are presented to illustrate that radiation pressure and Poynting-Robertson drag are only important for particles within a narrow size range. The orbital consequences of these radiation forces are considered both for heliocentric and planetocentric orbiting particles, and the coupling between particle sizes and dynamics is discussed. A qualitative derivation is presented for the differential Doppler effect, which is due to the differential Doppler shifting of radiation from approaching and receding solar hemispheres, and the Yarkovsky effect, which is important for rotating meter-to kilometer-sized particles, is briefly described.
    Keywords: ASTROPHYSICS
    Type: Icarus; 40; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Optical properties of silicates in the far ultraviolet (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Near-normal incidence reflectance measurements in the interval 1026-1640 A were performed on four silicates already studied in the visible and infrared. A Kramers-Kronig analysis of these data is used to calculate the complex index of refraction m = n - ik. New transmission measurements improve the determination of k in the interval 2500-4500 A, except for andesite, which is more opaque than had been previously observed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Icarus; 34; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
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