No abstract

Comparison of meteorological tower measurements with a high resolution CW-FM radar indicates that the device is applicable to studies of structure of temperature inversions, stable and unstable waves upon such inversions, thermal plumes and convective processes within the boundary layer. The radar also appears to follow the transport of insects by such processes.

The sampling cavity of the NBS refractome te rs has bee n e valuated in a wind tunnel , a wate r flow tunn el, and in the free atmos phere. The cavity is slightly velocity-sensitive. It is also as pectse nsitive, an error bein g introduced whe n the wind is oblique to the axi s of the cavity affecting th e level of th e s pec trum. Th e charac te ri stic flu shing length of th e cavity in normal operation is estimated as 0.75 meters whe n the wind is into the c avity and co nsid erably more whe n th e wind is at an oblique an gle. A modifi ed cavity has been de veloped whi c h a ppears to substantially impro ve the res ponse of the refractome te r.

No abstract

An experimental d etermination of the reflection coefficient over rough te rrain is r epo rted . The reflected signal received over rough terrain is considered to be mad e up oft wo components, one that is a specular component and the other a R ayleigh-distr ibuted componen t. Where one term inal is low, the Rayleigh component is considered to be small with respect to the sp.ecular component ?lIt increas:s in relative magnitude as the height of the lower te rJl?ln almcreases. A tenmnal h eIght IS reached where the specular component is no longe r ~Hgl11~Cant, and the refl ected energy is esse ntia lly Rayleigh-distributed . A t erm inal height I S qUickly reached a,?ove which the m ea n valu e of the reflected energy is relatively constant, of a low value, a nd md epend ent of the g razing angle.