NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Active-region evolution and solar rotation variations in solar UV irradiance, total solar irradiance, and soft X raysVariations in the total solar irradiance, solar UV spectral irradiance, and solar soft X-ray emission caused by active region evolution and solar rotation are analyzed by using concurrent measurements from the NIMBUS 7 and GOES satellites. The observations are interpreted by using simple empirical models that relate ground-based observations of the size and location of sunspots and plages to the full-disk temporal variations. It is found that the major dips in the photospheric total solar irradiance S, which are evident in both satellite measurements and model predictions, are usually not accompanied by outstanding enhancements in the chromospheric and upper photospheric UV spectral irradiance or coronal X rays. The main cause of this difference between the variability of S and of the UV flux is that the total chromospheric plage enhancements are not outstanding at those times when the total sunspot are outstanding. X rays are even more variable because of a much wider CMD sensitivity.
Document ID
19830036159
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Donnelly, R. F.
(NOAA, Air Resources Laboratories, Boulder CO, United States)
Heath, D. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lean, J. L.
(Cooperative Institute for Research in Environmental Sciences Boulder, CO, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Publication Information
Publication: Journal of Geophysical Research
Volume: 87
Subject Category
Solar Physics
Accession Number
83A17377
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available