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The Constants in the Equation for Atmospheric Refractive Index at Radio Frequencies
Abstract
Recent improvements in microwave techniques have resulted in precise measurements which indicate that the conventional constants K1 = 79°K/mb and K2′=4,800°K in the expression for the refractivity of air, N=(n-1) 106=[K1/T](p+ K2'e/T) should be revised. Various laboratories appear to have arrived at this conclusion independently. In much of radio propagation work the absolute value of the refractive index of the atmosphere is of small moment. However, in some work it is important and it seems highly desirable to decide upon a particular set of constants. Through consideration of the various recent experiments this paper arrives at a relation 77.6 e N = ~ p + 4,810-T T where p=total pressure in millibars e=partial pressure of water vapor in millibars T=absolute temperature=°C+273 This expression is considered to be good to 0.5 per cent in N for frequencies up to 30,000 mc and normally encountered ranges of temperatures, pressure and humidity.
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Cited by
Observing Earth's atmosphere with radio occultation measurements using the Global Positioning System
Kursinski, E. R., Hajj, G. A., Schofield, J. T., Linfield, R. P., & Hardy, K. R. (1997) · Journal of Geophysical Research: Atmospheres · doi:10.1029/97jd01569 · Cited by 1,430
Seidel, D. J., Ao, C. O., & Li, K. (2010) · Journal of Geophysical Research: Atmospheres · doi:10.1029/2009jd013680 · Cited by 708
Improving InSAR geodesy using Global Atmospheric Models
Jolivet, R., Agram, P. S., Lin, N. Y., Simons, M., Doin, M., Peltzer, G., & Li, Z. (2014) · Journal of Geophysical Research: Solid Earth · doi:10.1002/2013jb010588 · Cited by 346
Chelton, D. B., Ries, J. C., Haines, B. J., Fu, L.-L., & Callahan, P. S. (2001) · International Geophysics · doi:10.1016/s0074-6142(01)80146-7 · Cited by 345
Shen, Z., Shen, W.-B., & Zhang, S. (2016) · Geophysical Journal International · doi:10.1093/gji/ggw198 · Cited by 29
Metadata
- Authors
- Smith, E., & Weintraub, S.
- Venue
- Proceedings of the IRE
- Published
- 1953-08
- Volume
- 41
- Issue
- 8
- Pages
- 1035-1037
- ISSN
- 0096-8390 (ISSN-L)
- OpenAlex
- W2001432309
- Cited by
- 742
- References
- 0
- FWCI
- 8.68
- Type
- journal article
- Language
- en
- Open access
- closed
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- Smith, E., & Weintraub, S. (1953). The Constants in the Equation for Atmospheric Refractive Index at Radio Frequencies. Proceedings of the IRE. https://doi.org/10.1109/jrproc.1953.274297
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