The problem of clustering in laboratory studies of cometary dust
- Huffman, Donald R.
- Sep 1, 1988.
- Physical Description:
- 1 electronic document
- Restrictions on Access:
- Unclassified, Unlimited, Publicly available.
- In trying to understand the nature of interstellar or interplanetary dust grains it is tempting to simply rely on direct lab measurements of grain properties such as extinction. However, until agreement is achieved between directly measured extinction and the same property calculated from measured optical constants of the solid, application to astronomical observations is questionable. There are two major problems which are discussed: the problem of what optical constants to use in the calculation, and the almost unavoidable problem of particle clustering in lab studies. Regarding small particle measurements, a problem afflicting almost all lab measurements is the clustering of particles. Having failed in efforts to isolate particles, the solution to the problem was attempted with a simple theory which seems to adequately describe the extinction by small, clustered particles in many cases. The theory is briefly explained.
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19890003985.
Accession ID: 89N13356.
NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains; p 154-155.
- No Copyright.
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