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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Making allowance for errors in measurements of auroral positions based on ascafilms
Errors in measurements of auroral positions based on all-sky photographs
Diffusion of low energy auroral electrons in the atmosphere.
Diffusion rate calculation of low energy auroral electrons in polar atmosphere by Monte Carlo methods with attention to backscattering coefficient
Diffusion of low energy auroral electrons in the atmosphere
Monte Carlo method used on energy dissipation of electrons in air and applied to diffusion of low energy auroral electrons in atmosphere
Geomagnetic disturbances
Physical characteristics of polar disturbances and magnetic storms
Intensity distribution of the Lyman-Birge- Hopfield band system of N sub 2.
Relative intensity measurements of 50 major bands of Lyman-Birge-Hopfield /LBH/ system of nitrogen
Rocket observations of low energy auroral electrons.
Rocket observations of energy spectra of auroral electrons
The simultaneous determination of rocket trajectories and rapid auroral variations.
Simultaneous recording of rocket trajectory and rapid auroral variations using high sensitivity image orthicon TV system
Intense negative bays inside the auroral zone. I.
Intense negative bays occurring in auroral zone in early evening hours explained by westward extension of polar electrojet
Classification of five new chondrite finds from Roosevelt County, New Mexico
Five small, weathered meteorites recovered from Roosevelt County, New Mexico, USA, are called Roosevelt County 066-070. Based on optical microscopy and electron microprobe analysis of mafic minerals, RC 066-070 are classified as L5a chondrites. RC 068 and 069 are tentatively paired. RC 066 and RC 067 are not paired with RC 068 and RC 069. RC 066, 067 and 070 do not appear to be paired with each other or with RC 001-031.
Spinel-bearing, Al-rich chondrules in two chondrite finds from Roosevelt County, New Mexico - Indicators of nebular and parent body processes
Two rare spinel-bearing Al-rich chondrules are identified in chondrite finds from Roosevelt County, New Mexico-RC 071 (L4) and RC 072 (L5). These chondrules have unusual mineralogies dominated by highly and asymmetrically zoned Al-Cr-rich spinels. Two alternatives exist to explain the origin of this zoning-fractional crystallization or metamorphism. Fractional crystallization formed the zoning of the trivalent cations and caused a localized depletion in chromites around the large Al-Cr-rich spinels. Diffusive exchange and partitioning of Fe and Mg between olivine and spinel during parent-body metamorphism can explain the asymmetric zoning of these elements. The bulk compositions of the chondrules suggest affinities with the Na-Al-Cr-rich chondrules, as would be expected from the abundance of Al-Cr-rich spinels. The most important factors are the temperature to which the molten chondrule was heated and the cooling rate during crystallization. These two chondrules cooled rapidly from near the liquidus, as indicated by the zoning, occurrence and sizes of spinels, radiating chondrule textures and localized chromite depletions.
BB-CLIPS: Blackboard extensions to CLIPS
This paper describes a set of extensions made to CLIPS version 4.3 that provide capabilities similar to the blackboard control architecture described by Hayes-Roth. There are three types of additions made to the CLIPS shell. The first extends the syntax to allow the specification of blackboard locations for CLIPS facts. The second implements changes in CLIPS rules and the agenda manager that provide some of the powerful features of the blackboard control architecture. These additions provide dynamic prioritization of rules on the agenda allowing control strategies to be implemented that respond to the changing goals of the system. The final category of changes support the needs of continuous systems, including the ability for CLIPS to continue execution with an empty agenda.
Trace-Element Analyses of Carbonate Minerals in the Gunflint Banded Iron Formation
We report on the petrography, mineralogy and trace-element abundances of individual carbonate grains in the Early Proterozoic Gunflint BIF (Banded Iron Formation). Trace-element data may be used as environmental recorders of the fluid evolution from which the various carbonate phases precipitated. Additional information is contained in the original extended abstract.
High-resolution far ultraviolet spectrum of electron-excited SO(sub 2)
The high resolution UV capabilities (lamda/delta lambda = 10(sup 5)) of the Hubble Space Telscope (HST) equipped with the Space Telescope Imaging Spectrograph (STIS) reflects a need for high resolution laboratory UV spectral data base for comparison with observation.
Joint Galileo/ Cassini observations of the Jovian system
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Dawn/dusk aururas and propagating convection disturbances: ionospheric effects of increasing solar wind ram pressure
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Solar/Interplanetary Plasma Phenomena Causing Geomagnetic Activity at Earth
Solar wind phenomena leading to different types of geomagnetic activity are discussed.