Annual and Sub-Annual Effects of EUV (Extreme Ultraviolet) Heating. Volume I. Harmonic Analysis,
Abstract
The authors compute the rate of solar extreme ultraviolet radiation (EUV) heating in the upper atmosphere by photo-dissociation and photo-ionization, taking care to include properly the effects of oblique incidence of solar flux, sphericity of the atmosphere and ellipticity of the earth's orbit. The time and latitudinal variations of the computed heat function are revealed by numerical Fourier analysis of the heat function into harmonics of the yearly cycle. It is shown that EUV absorption contains a latitude independent semi-annual component of heating with the proper phase to account for the semi-annual density variations. Further, the annual component of the heat function predicts the existence of summer polar density increases in the northern and southern hemispheres. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 15, 1972
- Accession Number
- AD0745305
Entities
People
- Barbara K. Ching
- Yam T. Chiu
Organizations
- The Aerospace Corporation