No abstract

No abstract

The shapes of the D lines, integrated over the solar disk, have been observed from Madison, Wisconsin, United States, for a year, with spectroscopic resolution sufficient to resolve the ground‐state hyperfine structure of sodium in telluric absorption. An annual upper‐atmosphere sodium abundance plot shows an autumn maximum of (8±2)× 09 atoms/cm2 and no detectable sodium from April to August 1961. The observations in a single day show definite, apparently random, variations. Several other telluric absorption lines in the neighborhood are listed. Out to about 220 mK or 13 ppm from the line centers, the profiles of intensity I (relative to the continuum), corrected for telluric absorption, follow the expression I = I0 exp (|x|/xe)A, withI0 xeA D1(λ5896) 0.0495 217 mK or 12.8 ppm 2.14 ±0.0010 ±6 mK ±0.4 ppm ±0.10 D2(λ5890) 0.0444 228 mK or 13.4 ppm 2.16 ±0.0010 ±6mK ±0.4 ppm ±0.12The wave numbers of the D lines, corrected for the relative motion of the earth, show a relative red shift δσ/σ = (−2.7 ± 0.4) × 10−6, indicating that the net effect of the Lindholm shift and convection currents is small compared with the computed relative gravitational shift of −2.1×10−6.

No abstract

No abstract