A self contained, air-droppable, Expendable, Remote-Operating Weather Station (EROWS) has been developed to obtain information on several basic meteorological parameters from those areas where such data are either limited or otherwise unattainable. The EROWS vehicle and its associated sensors are described in detail, along with a functional description of the control-recorder, aircraft repeater, and aircraft dispenser that constitute the remaining components of the complete system. The results of field tests of EROWS units conducted at several locations are described. The testing indicates that the system performed satisfactorily under a wide variety of conditions. (Author).

The cryogenically cooled, optical dew/frost point hygrometer was developed to provide a fast response aircraft instrument for the measurement of very low frost-point temperatures encountered at the higher altitudes. A detailed description of the device is presented, along with a discussion of the laboratory and flight tests performed to date. Problems encountered during the tests are outlined, and recommended changes to the instrument are made for the benefit of those contemplating its use in the future. (Author).

In this report, the calculation of riometer absorption during several PCA events of particular interest is presented. These calculations are based on earlier work in which an improved effective recombination coefficient was derived and an atmospheric model for (1) each month of the year, (2) day and night, and (3) 60 deg N and 90 deg N latitude was presented. In this report, the calculated values of riometer absorption are presented for 5 PCA events: 2 Nov. 69, 7 Mar. 70, 25 Jan. 71, 2 Sep. 71, and 3 Aug. 72. The calculated values of riometer absorption are compared with experimental values measured for both day and night conditions at Thule, Greenland. An approximate connection between riometer absorption and the square-root of the proton flux for nighttime conditions is presented. This relationship, which has previously been applied only for daytime conditions, is discussed both on a fundamental level and on the level of verification by comparison with experiment. In addition, the basic equation widely used to calculate riometer absorption is compared with the original Sen-Wyller result.

Account book of Charles Peirce, location unknown, with entries for time and cash spent on job work as carpenter.