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Featured researches published by S. Ko.


SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation | 1996

Atmospheric studies using the high-resolution fly's eye xenon flasher array

L. R. Wiencke; D. J. Bird; G. F. Chen; R. W. Clay; Hongyue Dai; Bruce R. Dawson; M.-H. A. Huang; Charles C. H. Jui; Matthew John Kidd; D. B. Kieda; S. Ko; Christian Gronhoj Larsen; Eugene C. Loh; J. D. Smith; P. Sokolsky; P. Sommers; J. K. K. Tang; Stan B. Thomas; C. R. Wilkinson; Shuhei Yoshida

The High Resolution Flys Eye (HiRes) cosmic ray detector at Dugway Utah, measures UV scintillation light from extensive air showers. The detection technique is calorimetric in that the amount of light produced is proportional to the energy of the primary particle. Primary particle energies range from 1017 to more than 1020 electron volts. The detector can measure air showers more than 30 km away, a distance of several atmospheric extinction lengths. Variations in the atmosphere can cause significant variations in the amount of light reaching the detector. Atmospheric monitoring is extremely important. This paper discusses a method, under development, that uses the HiRes detector to measure light scattered from pulsed collimated xenon flashbulb sources (Flashers). Discussion includes a description of the light sources and a preliminary data analysis to extract a measurement of atmospheric extinction length and scale height.


Archive | 1987

The Ultra High Energy Cosmic Ray Spectrum

G. L. Cassiday; R. J. Cooper; S. C. Corbato; Bruce R. Dawson; J. W. Elbert; B. Fick; K. D. Green; D. B. Kieda; S. Ko; E. C. Loh; M. H. Salamon; J. D. Smith; P. Sokolsky; S.B. Thomas; B. Wheeler


Archive | 1991

A Search for Evidence of Point Sources in the Cherenkov Flash Data from FLY's Eye II

R. Cooper; S. C. Corbato; Hongyue Dai; B. R. Dawson; Bruce L. Emerson; J. W. Elbert; D. B. Kieda; S. Ko; Eugene C. Loh; Ming Luo; M. H. Salamon; J. D. Smith; P. Sokolsky; P. Sommers; J. K. K. Tang; Stan B. Thomas


Archive | 1991

Limits on Deeply Penetrating Particles from the Fly's Eye Detector

R. J. Cooper; S. C. Corbato; Hongyue Dai; B. R. Dawson; Bruce L. Emerson; J. W. Elbert; D. B. Kieda; S. Ko; Eugene C. Loh; Ming Luo; M. H. Salamon; J. D. Smith; P. Sokolsky; P. Sommers; J. K. K. Tang; Stan B. Thomas


Archive | 1990

The HIRES Fly's Eye Project

L. G. Cassiday; R. J. Cooper; C. S. Corbato; R. B. Dawson; W. J. Elbert; B. D. Kieda; S. Ko; C. E. Loh; H. M. Salamon; J. D. Smith; P. Sokolsky; B. V. S. Thomas; Matthew B. Wheeler


Archive | 1990

A Study of Cyg X-3, Her X-1, and the Crab Nebula for Gamma Ray Emissions above 7X1013 eV

S. Ko; C. E. Loh; H. M. Salamon; P. Sokolsky; P. Sommers


Archive | 1990

New Limits on the Flux of Deeply Penetrating Particles at the Fly's Eye

C. S. Corbato; R. B. Dawson; E. B. Fick; B. D. Kieda; S. Ko; C. E. Loh; H. M. Salamon; J. D. Smith; P. Sommers; P. Sokolsky; B. V. S. Thomas; B. Wheeler


Archive | 1990

The Proton-Air Inelastic Cross Section at E - 0. 3 EeV

L. G. Cassiday; R. J. Cooper; C. S. Corbato; R. B. Dawson; D. K. Green; B. D. Kieda; S. Ko; F. D. Liebing; C. E. Loh; J. D. Smith; P. Sokolsky; B. V. S. Thomas; B. Wheeler


Archive | 1990

Hercules X-1 Results from the Utah Cherenkov Array

D. Ciampa; C. S. Corbato; W. J. Elbert; E. B. Fick; D. K. Green; B. D. Kieda; S. Ko; Jeffrey K. Kolodziejczak; C. E. Loh; John A. J. Matthews; F. D. Nitz; David A. Sinclair; P. Sommers; G. Thornton; C. J. van der Velde


Archive | 1990

A Search for 1018 eV Point Sources, Including Cygnus X-3

L. G. Cassiday; R. J. Cooper; C. S. Corbato; R. B. Dawson; W. J. Elbert; E. B. Fick; D. K. Green; B. D. Kieda; S. Ko; C. E. Loh; H. M. Salamon; J. D. Smith; P. Sokolsky; P. Sommers; B. V. S. Thomas; Matthew B. Wheeler

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