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Composition and energetics of solar flare particle events measured by satellites, 1989--1991

Description: The Synchronous Orbit Particle Analyzer (SOPA), on board the satellite 1989-046 and others, has detected ions from carbon through nickel at energies from 2 to 50 MeV in the great solar energetic particle events of the current solar cycle. Energetic protons from the same events have been detected by the Charged Particle Analyzer (CPA) on board the satellite 1984-129 and others. We present here a collection of data from these various instruments that includes events of 1989, 1990, and 1991. We de… more
Date: January 1, 1991
Creator: Gisler, G.R.; Belian, R.D.; Cayton, T.E. & Reeves, G.D.
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Partner: UNT Libraries Government Documents Department
open access

Simulations of second-order Fermi acceleration of electrons: Solving the injection problem

Description: The boosting of electrons from a Maxwellian distribution into a suprathermal power-law tail has long been recognized as an important bottleneck governing the subsequent acceleration of some of these electrons to relativistic energies. This is the seed or injection problem. I study this boosting process using a test-particle simulation code, following the full equations of motion of tens of thousands of electrons chosen from a thermal population as they move through general time-dependent magnet… more
Date: January 1, 1991
Creator: Gisler, G.R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Space optical and low-frequency radio searches for earth-crossing asteroids and comets

Description: Earth-crossing asteroids (ECAs) are small and backscatter strongly, so they are usually discovered near opposition during dose approaches to Earth. This opposition effect produces strong biases in Earth-based searches for ECAS, particularly for Atens. An observing site much closer to the sun than the orbit of Earth, such as a satellite orbiting Venus or telescopes on Mercury, would not suffer this bias. All Atens that cross the orbit of Earth would be observable near opposition from these sites… more
Date: January 1, 1993
Creator: Hills, J.G. & Gisler, G.R.
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Partner: UNT Libraries Government Documents Department
open access

Spatio-spectral image analysis using classical and neural algorithms

Description: Remote imaging at high spatial resolution has a number of environmental, industrial, and military applications. Analysis of high-resolution multi-spectral images usually involves either spectral analysis of single pixels in a multi- or hyper-spectral image or spatial analysis of multi-pixels in a panchromatic or monochromatic image. Although insufficient for some pattern recognition applications individually, the combination of spatial and spectral analytical techniques may allow the identifica… more
Date: December 31, 1996
Creator: Roberts, S.; Gisler, G.R. & Theiler, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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