The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
H. E. Lagow - One of the best experts on this subject based on the ideXlab platform.
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Summer-day auroral-zone atmospheric-structure measurements from 100 to 210 kilometers
Journal of Geophysical Research, 2020Co-Authors: R. Horowitz, H. E. LagowAbstract:The density and pressure of the atmosphere from 100 to 210 kilometers above Fort Churchill, Manitoba, Canada, were determined from the IGY NN3.13F Aerobee-Hi rocket flight on July 29, 1957, at 4:00 p.m., CST. Two magnetic cold-cathode Ionization Gages were used to measure pressure and pressure changes on the side of the rolling rocket. Excellent agreement was obtained (a) between both Gages throughout flight, and (b) between ascent and descent measurements. Measured pressures in the region from 100 to 120 kilometers were corrected for a residual gas pressure of approximately 2×10−5 mm Hg. An ambient pressure of 10−4 mm Hg was obtained at 107 kilometers. The derived pressure of 4×10−6 mm Hg at 210 kilometers is an order of magnitude greater than the corresponding 1951 values measured at the White Sands Proving Ground, New Mexico. Densities were measured from 125 to 210 kilometers. The density value of 6×10−7 gm/m3 at 210 kilometers is five times greater than the 1951 measurement, while at 140 kilometers the difference is a factor of two. Scale heights (RT/Mg) were derived from the measured pressure and density data vs altitude, using the hydrostatic equation. The scale-height value obtained at 210 kilometers was 95 kilometers, and the scale-height gradient from 190 to 210 kilometers was 0.1 km/km.
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Fall‐day auroral‐zone atmospheric structure measurements from 100 to 188 km
Journal of Geophysical Research, 2020Co-Authors: R. Horowitz, H. E. Lagow, J. F. GiulianiAbstract:The density and pressure of the atmosphere from 100 to 188 km above Fort Churchill, Manitoba, Canada, were determined from the IGY NN 3.15 Aerobee-Hi rocket flight on October 31, 1958, at 2:00 P.M., CST. Two magnetic cold-cathode Ionization Gages were used to measure pressure and pressure changes on the side of the rolling rocket. Excellent agreement was obtained (a) between the two Gages throughout flight, and (b) between ascent and descent measurements. Measured pressures in the region from 100 to 112.5 km were corrected for a residual gas pressure of approximately 3×10−5 mm Hg. An ambient pressure of 10−4 mm Hg was obtained at 106 km. The derived pressure of 2.3×10−6 mm Hg at 188 km is approximately a factor of 2 lower than the corresponding arctic summer-day value. Densities were measured from 130 to 188 km. The density value of 5.2×10−7 g/m3 at 188 km is approximately 40 per cent lower than the summer-day value. The density profile presented here is in good agreement with the arctic November-day density point obtained at 200 km in 1956. Scale heights (RT/Mg) were derived from the measured pressure and density data vs. altitude, using the hydrostatic equation. The scale height value obtained at 188 km was 63 km, and the scale height gradient from 180 to 188 km was 0.5 km/km.
R. Horowitz - One of the best experts on this subject based on the ideXlab platform.
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Summer-day auroral-zone atmospheric-structure measurements from 100 to 210 kilometers
Journal of Geophysical Research, 2020Co-Authors: R. Horowitz, H. E. LagowAbstract:The density and pressure of the atmosphere from 100 to 210 kilometers above Fort Churchill, Manitoba, Canada, were determined from the IGY NN3.13F Aerobee-Hi rocket flight on July 29, 1957, at 4:00 p.m., CST. Two magnetic cold-cathode Ionization Gages were used to measure pressure and pressure changes on the side of the rolling rocket. Excellent agreement was obtained (a) between both Gages throughout flight, and (b) between ascent and descent measurements. Measured pressures in the region from 100 to 120 kilometers were corrected for a residual gas pressure of approximately 2×10−5 mm Hg. An ambient pressure of 10−4 mm Hg was obtained at 107 kilometers. The derived pressure of 4×10−6 mm Hg at 210 kilometers is an order of magnitude greater than the corresponding 1951 values measured at the White Sands Proving Ground, New Mexico. Densities were measured from 125 to 210 kilometers. The density value of 6×10−7 gm/m3 at 210 kilometers is five times greater than the 1951 measurement, while at 140 kilometers the difference is a factor of two. Scale heights (RT/Mg) were derived from the measured pressure and density data vs altitude, using the hydrostatic equation. The scale-height value obtained at 210 kilometers was 95 kilometers, and the scale-height gradient from 190 to 210 kilometers was 0.1 km/km.
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Fall‐day auroral‐zone atmospheric structure measurements from 100 to 188 km
Journal of Geophysical Research, 2020Co-Authors: R. Horowitz, H. E. Lagow, J. F. GiulianiAbstract:The density and pressure of the atmosphere from 100 to 188 km above Fort Churchill, Manitoba, Canada, were determined from the IGY NN 3.15 Aerobee-Hi rocket flight on October 31, 1958, at 2:00 P.M., CST. Two magnetic cold-cathode Ionization Gages were used to measure pressure and pressure changes on the side of the rolling rocket. Excellent agreement was obtained (a) between the two Gages throughout flight, and (b) between ascent and descent measurements. Measured pressures in the region from 100 to 112.5 km were corrected for a residual gas pressure of approximately 3×10−5 mm Hg. An ambient pressure of 10−4 mm Hg was obtained at 106 km. The derived pressure of 2.3×10−6 mm Hg at 188 km is approximately a factor of 2 lower than the corresponding arctic summer-day value. Densities were measured from 130 to 188 km. The density value of 5.2×10−7 g/m3 at 188 km is approximately 40 per cent lower than the summer-day value. The density profile presented here is in good agreement with the arctic November-day density point obtained at 200 km in 1956. Scale heights (RT/Mg) were derived from the measured pressure and density data vs. altitude, using the hydrostatic equation. The scale height value obtained at 188 km was 63 km, and the scale height gradient from 180 to 188 km was 0.5 km/km.
J. F. Giuliani - One of the best experts on this subject based on the ideXlab platform.
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Fall‐day auroral‐zone atmospheric structure measurements from 100 to 188 km
Journal of Geophysical Research, 2020Co-Authors: R. Horowitz, H. E. Lagow, J. F. GiulianiAbstract:The density and pressure of the atmosphere from 100 to 188 km above Fort Churchill, Manitoba, Canada, were determined from the IGY NN 3.15 Aerobee-Hi rocket flight on October 31, 1958, at 2:00 P.M., CST. Two magnetic cold-cathode Ionization Gages were used to measure pressure and pressure changes on the side of the rolling rocket. Excellent agreement was obtained (a) between the two Gages throughout flight, and (b) between ascent and descent measurements. Measured pressures in the region from 100 to 112.5 km were corrected for a residual gas pressure of approximately 3×10−5 mm Hg. An ambient pressure of 10−4 mm Hg was obtained at 106 km. The derived pressure of 2.3×10−6 mm Hg at 188 km is approximately a factor of 2 lower than the corresponding arctic summer-day value. Densities were measured from 130 to 188 km. The density value of 5.2×10−7 g/m3 at 188 km is approximately 40 per cent lower than the summer-day value. The density profile presented here is in good agreement with the arctic November-day density point obtained at 200 km in 1956. Scale heights (RT/Mg) were derived from the measured pressure and density data vs. altitude, using the hydrostatic equation. The scale height value obtained at 188 km was 63 km, and the scale height gradient from 180 to 188 km was 0.5 km/km.
A.k. Oppenheim - One of the best experts on this subject based on the ideXlab platform.
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ON THE DEVELOPMENT OF GASEOUS DETONATION. III. Ionization WORLD LINES. Technical Note DR 3
2020Co-Authors: G. J. Hecht, A. J. Laderman, R. A. Stern, A.k. OppenheimAbstract:The design and construction of an Ionization detection circuit to measure Ionization world lines during the development of detonation are described. The Ionization processes occurring in flames, shocks, and detonations are rewiewed. A critical survey of existing Ionization Gages is made. The evaluation of performance criteria for the present purpose is described and the design of the gage and electronic apparatus reported. The operation of the instrument is demonstrated by means of experiments performed with stoichiometric hydrogen- oxygen mixtures. It appears that the apparatus is a reliable and sufficiently accurate instrument for the measurement of Ionization world lines during the development of detonation and that it can be adjusted so that within most of the operating range it registers the world lines of the flame front. (auth)
G. J. Hecht - One of the best experts on this subject based on the ideXlab platform.
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ON THE DEVELOPMENT OF GASEOUS DETONATION. III. Ionization WORLD LINES. Technical Note DR 3
2020Co-Authors: G. J. Hecht, A. J. Laderman, R. A. Stern, A.k. OppenheimAbstract:The design and construction of an Ionization detection circuit to measure Ionization world lines during the development of detonation are described. The Ionization processes occurring in flames, shocks, and detonations are rewiewed. A critical survey of existing Ionization Gages is made. The evaluation of performance criteria for the present purpose is described and the design of the gage and electronic apparatus reported. The operation of the instrument is demonstrated by means of experiments performed with stoichiometric hydrogen- oxygen mixtures. It appears that the apparatus is a reliable and sufficiently accurate instrument for the measurement of Ionization world lines during the development of detonation and that it can be adjusted so that within most of the operating range it registers the world lines of the flame front. (auth)
