SIO Reference 59-5. The Visibility Laboratory of the University of California, La Jolla Campus, is engaged in an on-going research program studying image transmission through the atmosphere. The paper "Image Transmission by the4 Troposphere I," published in the Journal of the Optical Society ofAmerica, discusses this program. In that paper correlation betweencertain optical and meteorological parameters is indicated. The studyof this correlation has continued and this report describes the resultsof data gathered from a second formation flight of two airplanes, theinstrumented B-29 and a microwave refractometer-equipped C-131 fromPatrick Air Force Base squadron.

SIO Reference 61-2. Certain optical measurements of the atmosphere were made by the Visibility Laboratory of the University of California, San Diego, 21 June 1958 over central Minnesota. Data were recorded from daybreak to midmorning during the time four balloons carrying optical instrumentation from the Geophysics Research Directorate, Air Force Research Division, Bedford,Massachusetts, were floating at higher altitudes.

SIO Reference 61-3. Certain optical measurements of the atmosphere were made by the Visibility Laboratory of the University of California, San Diego, 21 June 1958 over central Minnesota. Data were recorded from daybreak to midmorning during the time four balloons carrying optical instrumentation from the Geophysics Research Directorate, Air Force Research Division, Bedford, Massachusetts, were floating- at higher altitudes.

SIO Reference 59-57. This report tabulates some real contrast reduction factors computed from measurod atmospheric optical quantities. These contrast reduction factors range from .067 to .175.*

SIO Reference 59-32-(1). Certain optical measurements of the atmosphere were made by the Visibility Laboratory, University of California, La Jolla Campus, 21 June 1953, over central ainnesota. These were recorded from daybreak to mid-morning during the time four optically instrumented balloons launched by -ir Force Cambridge Research Center recorded related data at a higher altitude.The data recorded by the Visibility Laboratory are presented herein as a catalogue of the recorded optical measurements as they varied with altitude, time of day, azimuthal angle with reopect to the sun, and meteorological conditions.

SIO Reference 60-55. The Visibility Laboratory of the University of California, La Jolla Campus, is engaged in an on-going research program studying the transmission of optical images through the atmosphere. In connection with this work several data gathering flights were made in Florida, in the vicinity of Eglin Air Force Base, in the spring of 1957. Flight 112, during which data in this report were measured, was one of these flights.

SIO Reference 60-22. The Visibility Laboratory of the University of California, La Jolla Campus, is engaged in an on-going research program studying optical image transmission through the atmosphere. In connection with this work several data gathering flights were made in western Florida in the vicinity of Eglin Air Force Base in the spring of 1957. Flight 112, the subject of this report, was one of these.

SIO Reference 61-1. Certain optical measurements of the atmosphere were made by the Visibility Laboratory of the University of California, San Diego, 21 June 1958, over central Minnesota. Data were recorded from daybreak to midmorning during the time four balloons carrying optical instrumentation from the Geophysics Research Directorate, Air Force Research Division, Bedford, Massachusetts, were floating at a higher altitude.

SIO Reference 60-56. The Visibility Laboratory of the University of California, La Jolla Campus, is engaged in an on-going research program studying the transmission of optical images through the atmosphere. In connection with this work several data gathering flights were made in Florida, in the vicinity of Eglin Air Force Base, in the spring of 1957. Flight 112, during which data in this report were measured, was one of these flights.

SIO Reference 60-32. The Visibility Laboratory of the University of California, La Jolla Campus, is engaged in an on-going research program concerning optical image transmission through the atmosphere. In connection with thi3 work several data gathering flights were made in western Florida in the vicinity of Eglin Air Force Base in the spring of 1957. Flight 112, during which data in this report were measured, was one of these flights. Part I of this report, SIO Reforence 60-22, of April I960, presented data as a c atalogue of recorded optical measurements less sky luminance and sky radiance distributions. This part of the report, Part II, presents the sky luminance distribution as it varied with altitude, zenith angle, and azimuth with respect to the sun. Sky radiance distribution will be presented at a later date as Part III of this report.