NDLI: Effects of changes in convective efficiency on the solar radius and luminosity

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Effects of changes in convective efficiency on the solar radius and luminosity

Content Provider	NASA Technical Reports Server (NTRS)
Author	Sweigart, A. V.
Copyright Year	1981
Description	A sequence of solar models has been constructed in order to investigate the sensitivity of the solar radius and luminosity to small changes in the ratio alpha of the mixing length lambda to the pressure-scale height Hp throughout the solar convective envelope. The basic procedure for determining this sensitivity was to impose a perturbation in alpha within the convective envelope and then to follow the resulting changes in the solar radius delta R and luminosity delta L for the next 10 to the 6th power yrs. These calculations gave the following results. (1) A perturbation in alpha produces immediate changes in the solar radius and luminosity. Initially delta L and delta alpha are related by delta L/L = 0.30 delta alpha/alpha. (2) The value of the ratio w = delta log R/delta log L is strongly time dependent. Its value just after the perturbation in alpha is 6.5 x 10 to the minus 4th power. (3) The ratio H = (delta log L) d delta log R/dt is much less time dependent and is a more suitable means for relating the changes in the solar radius and luminosity. (4) Both of these ratios imply that for any reasonable change in the solar luminosity the corresponding change in the solar radius is negligible.
File Size	814974
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820009156
Archival Resource Key	ark:/13960/t23c0vt05
Language	English
Publisher Date	1981-12-01
Access Restriction	Open
Subject Keyword	Solar Physics Solar Diameter Efficiency Luminosity Variations Solar Constant Mathematical Models Computerized Simulation Perturbation Convection Illuminance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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