. Smithsonian miscellaneous collections. too, that Fe values go nearly to zero during totalsolar eclipses. These Carnegie Institution measurements seemed well 1 Paper delivered May 31, 1945, before the Meteorological Section, AmericanGeophysical Union, Washington, D. C. Smithsonian Miscellaneous Collections, Vol. 104, No. 13 2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO4 suited to check my earlier results on the correlation of solar variationwith temperature departures. I made monthly graphs of my daily mean daylight values of Fe forHuancayo and Watheroo. The two stations do not fully agree,
. Smithsonian miscellaneous collections. too, that Fe values go nearly to zero during totalsolar eclipses. These Carnegie Institution measurements seemed well 1 Paper delivered May 31, 1945, before the Meteorological Section, AmericanGeophysical Union, Washington, D. C. Smithsonian Miscellaneous Collections, Vol. 104, No. 13 2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO4 suited to check my earlier results on the correlation of solar variationwith temperature departures. I made monthly graphs of my daily mean daylight values of Fe forHuancayo and Watheroo. The two stations do not fully agree, butthey both show nearly simultaneously many rises and falls of the dailyvalues. These changes observed at both stations frequently reach10 percent or more, whereas the percentage changes found in thesolar constant seldom exceed i percent. I found from the 7 years available, 1938 to 1944, from 15 to 25cases of rise, and 15 to 25 cases of fall of mean daily Fe values, foreach of the 12 months, January to December. For each case I wrote. Fig. 1.—Comparison of daily ionization results of Huancayo, Peru, andWatheroo, Australia. Mean critical frequencies for layer Fe. Each point themean of 11 daylight hours. Sequences of increase and decrease of solar activityindicated. a line of the departures from normal temperature at Washington from5 days before to 19 days after the zeroth day, when the solar changeseemed to begin. Thus, for each of the 12 months of the year I had atable of 15 to 25 lines, and 25 columns. The mean values of thecolumns, when plotted, showed the average sequences of temperaturesat Washington which are caused by the rise and fall of the solaractivity during each month of the year. These curves were almost exactly the same in phases and ampli-tudes as the curves obtained similarly from the dates when the solarconstant rose and fell in the years 1924 to The curves areindeed so nearly identical that there is no reason to separate the twosets of data, one der
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