Near-ground vertical profile of refractive-index fluctuations

L. C. Andrews; R. L. Phillips; D. Wayne; T. Leclerc; P. Sauer; R. Crabbs; J. Kiriazes

doi:10.1117/12.820369

30 April 2009 Near-ground vertical profile of refractive-index fluctuations

L. C. Andrews, R. L. Phillips, D. Wayne, T. Leclerc, P. Sauer, R. Crabbs, J. Kiriazes

Proceedings Volume 7324, Atmospheric Propagation VI; 732402 (2009) https://doi.org/10.1117/12.820369
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

The most commonly used altitude-dependent model for refractive index fluctuations, over long high-altitude slant paths or ground/space links, is the Hufnagel-Valley model. For the near-ground turbulence portion of the path, this model uses an exponential decay term suggested by Valley to connect ground level turbulence with the original Hufnagel model which was constructed for turbulence above 3 km. However, it has long been observed that refractive-index fluctuations in the first few hundred meters near the ground decrease with altitude raised to the -4/3 power rather than exponentially. Recent and some earlier measurements of refractive-index fluctuations are presented in this paper along with a theoretical modification of the Hufnagel model to account for low-altitude turbulence exhibiting this power-law behavior.

Citation Download Citation

L. C. Andrews, R. L. Phillips, D. Wayne, T. Leclerc, P. Sauer, R. Crabbs, and J. Kiriazes "Near-ground vertical profile of refractive-index fluctuations", Proc. SPIE 7324, Atmospheric Propagation VI, 732402 (30 April 2009); https://doi.org/10.1117/12.820369

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available