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Farlow, N. H.

Publications and source records attributed to Farlow, N. H..

35 records · Page 2
All sourcesNASA NTRSDOE OSTI
NASA NTRS1973

Dust Storms in Space?

Primarily from the Pioneer 8 and 9 results, it is concluded that the flux of picogram sized dust particles near the earth's orbit has been constant to within the observational limits over three years of observation. In particular, since dust streams are not observed, they cannot explain microphone detected events. However, the possibility of rare events due to dust blown directly off a cometary nucleus (such as that reported for Comet Bennett) cannot be completely ruled out.

Roosen, R. G.↗
NASA NTRS1972

Analysis of microsize particulates

Unique methods for analyzing individual particles ranging in size from 0.01 to 1000 micrometers have been developed for investigation of nature of cosmic dust. Methods are applicable to particulate aerosols and contaminants characteristically encountered in studies of air pollution and in experiments designed to abate pollution.

Blanchard, M. B.↗
NASA NTRS1972

Analysis of individual particles collected from the stratosphere.

Four classified types of particles in stratospheric balloon collections include chains, aggregates, crystals, and irregular solids which are often liquid coated. An analysis has been made of many individual particles using an X-ray detector on a scanning electron microscope. Chain type particles are composed entirely of elements lighter than sodium. All other particle types are composed mostly of various combinations of the elements Al, Si, Na, K, Ca, Fe, Mg, Ti, and S. The most common element group is Al, Si, Ca or K, and Fe, followed by sulfur or calcium alone. At lower altitudes (12-15 km), liquid is usually associated with the particles and sulfur is prominent. At higher altitudes (23-36 km), liquids and sulfur are usually absent. However, when liquids are occasionally found, so is sulfur. Particles collected with NASA aircraft at 12 km also contain mostly the Al, Si, Ca, Fe element group with associated sulfur, or sulfur alone.

Farlow, N. H.↗
NASA NTRS1972

Cosmic dust in the mesosphere.

Study of the nature of cosmic dust particles collected by two recoverable rockets launched at Fort Churchill, Canada, in the spring of 1970, before the noctilucent cloud season in order to avoid the interference of uplifted atmospheric aerosols during the determination of the concentration of background cosmic dust. The study was designed to verify the results of a previous study for which dust particles were collected in the summer of 1968 by a rocket launched through a noctilucent cloud at the same location. The findings support the hypothesis that occasional high concentrations of dust in the mesosphere are due to uplifted aerosols which could be of a terrestrial or cosmic origin.

Farlow, N. H.↗
NASA NTRS1972

Upper atmospheric dust concentrations in polar regions.

Investigation of dust concentrations in the upper atmosphere at the polar regions by sounding rocket flights. The results indicate no normal existence of high concentration of dust and show no variation in the concentration of particles in the upper atmosphere as a function of the time of day.

Ferry, G. V.↗
NASA NTRS1971

Methods of analyzing microsize particulate aerosols and contaminants.

Methods for analyzing atmospheric aerosols and particulate contaminants from natural and industrial sources are briefly described. Their development was spurred by interest in cosmic dust investigations. These methods make it possible to analyze individual particles ranging in size from 0.01 to 1000 microns for elemental and mineralogical content. The described methods include transmission electron microscopy, scanning electron microscopy, electron probe microanalysis, X-ray diffraction, optical mineralogy, and density measurement.

Blanchard, M. B.↗