NDLI: How does the sun's spectrum vary?

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How does the sun's spectrum vary?

Content Provider	NASA Technical Reports Server (NTRS)
Author	DeLand, Matthew T. Lean, Judith L.
Copyright Year	2011
Description	Recent observations made by the Spectral Irradiance Monitor (SIM) on the Solar Radiation and Climate Experiment (SORCE) spacecraft suggest that the Sun's visible and infrared spectral irradiance increased from 2004 to 2008, even as the total solar irradiance measured simultaneously by SORCE's Total Irradiance Monitor (TIM) decreased. As well, solar ultraviolet (UV) irradiance decreased 3 to 10 times more than expected from prior observations and model calculations of the known effects of sunspot and facular solar features. Analysis of the SIM spectral irradiance observations during the solar minimum epoch of 2008, when solar activity was essentially invariant, exposes trends in the SIM observations relative to both total solar irradiance and solar activity that are unlikely solar in origin. We suggest that the SIM's radically different solar variability characterization is a consequence of undetected instrument sensitivity drifts, not true solar spectrum changes. It is thus doubtful that simulations of climate and atmospheric change using SIM measurements are indicative of real behavior in the Earth's climate and atmosphere.
File Size	716795
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110023421
Archival Resource Key	ark:/13960/t6wx2cm7k
Language	English
Publisher Date	2011-09-08
Access Restriction	Open
Subject Keyword	Geophysics Characterization Light Visible Radiation Simulation Solar Activity Effects Spectral Emission Infrared Radiation Irradiance Solar Radiation Sunspots 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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