Comparison of near-surface bulk and scintillation C2n measurements during EOPACE

Paul A. Frederickson; Kenneth L. Davidson; Carl R. Zeisse; Charles S. Bendall

doi:10.1117/12.330244

3 November 1998 Comparison of near-surface bulk and scintillation C2n measurements during EOPACE

Paul A. Frederickson, Kenneth L. Davidson, Carl R. Zeisse, Charles S. Bendall

Proceedings Volume 3433, Propagation and Imaging through the Atmosphere II; (1998) https://doi.org/10.1117/12.330244
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

During the Electro-Optical Propagation Assessment in a Coastal Environment (EOPACE) experiment of May-June 1998, IR scintillation measurements were obtained along a 7 km path over San Diego Bay. Simultaneous meteorological measurement were obtained from a buoy located at the midpoint of the transmission path. Bulk estimates of the refractive index structure parameter, C_n² were computed from the buoy data and compared with scintillation-derived C_n² values. The bulk C_n² estimates agreed well with the scintillation measurements in unstable conditions. The agreement between the two methods was poor for near-neutral and stable conditions. In particular, when the air-sea temperature difference has small positive values the bulk model predicts the vertical refractive index gradient approaches zero, resulting in rapid decrease in bulk C_n² estimates. These predicted decreases in C_n² were not observed in the path-averaged scintillation measurements.

Citation Download Citation

Paul A. Frederickson, Kenneth L. Davidson, Carl R. Zeisse, and Charles S. Bendall "Comparison of near-surface bulk and scintillation C2n measurements during EOPACE", Proc. SPIE 3433, Propagation and Imaging through the Atmosphere II, (3 November 1998); https://doi.org/10.1117/12.330244

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