Abstract
The purpose of this note is to describe an atlas of oblique-incidence ionogram s recen tly compiled by th e authors [1 ].2 The a tlas is intended to serve a twofold purpose: First, to provide a r easonably comprehensive introduction to this type of ionogram for those worker s who are not now familiar with them , and second , to present records which illus trate the various propagation characteristics of the specific paths used by the Nation al Bureau of Standards. An analy tical study of the technique and the experimental results was given by Agy and D avies [2] . To da te, NBS sweep-frequency experilTlents have been carried out over two approximately cast-west paths [2]: Washington , D .C. t. Louis, Mo. (abou t 1,1 50 km) [3,4], and Washington , D .C.Boulder , Colo . (abou t 2,370 km) [5]. A vertical incidence ionosonde was operated a t th e pa th midpoin t in each case . The a tlas is divided in to four par ts, namely:
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Schedule a callMore From: Journal of Research of the National Bureau of Standards, Section D: Radio Propagation
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