NDLI: An investigation of short period oscillations of the solar irradiance and their time variations

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An investigation of short period oscillations of the solar irradiance and their time variations

Content Provider	NASA Technical Reports Server (NTRS)
Author	Noyes, Robert W.
Copyright Year	1987
Description	Measurements of solar irradiance fluctuations by the Active Cavity Radiometer (ACRIM) instrument onboard the Solar Maximum Mission (SMM) show variations on a time scale of about 5 minutes due to solar p-mode oscillations, as well as longer-term variations related to solar magnetic activity. The question was studied whether the p-mode frequencies change with time as a result of changing solar structure associated with the activity cycle. The ACRIM data on SMM are particularly well-suited for this purpose, because the instrument operated continuously from February 1980 to December 1980 and again from May 1984 to the present. The main activity entailed a detailed study of the observational data to determine if a change in the p-mode frequencies is evident from the time of solar maximum to that of solar minimum. It was concluded that the measured eigenfrequencies were significantly higher during the 1980 time frame than during the 1984 to 1986 time frame. The conclusion that there is significant change in the eigenfrequencies with the activity cycle remains only tentative, and needs confirmation from analysis of more data during the upcoming solar maximum.
File Size	608212
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870018152
Archival Resource Key	ark:/13960/t88h3hh16
Language	English
Publisher Date	1987-08-01
Access Restriction	Open
Subject Keyword	Solar Physics Radiometers P Waves Wave Propagation Oscillations Data Processing Irradiance Solar Maximum Mission Sunspots Fast Fourier Transformations Solar Magnetic Field Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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