Three-component model of the variability of the solar ultraviolet flux: 145--200 nM

Journal Article · Wed Dec 01 04:00:00 EST 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA087iA12p10307· OSTI ID:5988181

Lean, J L; White, O R; Livingston, W C; Heath, D F; Donnelly, R F; Skumanich, A

A three-component model has been developed to examine the variation with solar activity of the far ultraviolet irradiance between 145 and 200 nm. This model is based on spatially resolved observations of the Call K chromosphere and includes the contributions to the full disk flux from both plage and active network emission. The 27-day modulation of the ultraviolet flux is explained by the evolution and rotation of the plage regions on the solar disc. Over the longer time scale of the eleven-year cycle it is essential that changes in the active network arising from the decay of plage regions also be solar flux is it possible to simultaneously reproduce the 27-day variability observed by the solar backscatter ultraviolet experiment on the Nimbus 7 satellite and the changes from the minimum to the maximum of the solar activity cycle observed by the rocket experiments of the Laboratory for Atmospheric and Space Physics and by the extreme ultraviolet spectrometer on the Atmospheric Explorer E satellite. It is shown that the AE-E experiment measured a smaller solar cycle variability for the ultraviolet irradiances than is predicted by the model calculations because of the spatially restricted field of view of this instrument.

• Research Organization: Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, Boulder, Colorado 80309
• OSTI ID: 5988181
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 87:A12; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CHROMOSPHERE
DIRECT SOLAR RADIATION
ELECTROMAGNETIC RADIATION
FAR ULTRAVIOLET RADIATION
NIMBUS SATELLITES
RADIATIONS
SATELLITES
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CYCLE
SOLAR FLUX
SOLAR PROMINENCES
SOLAR RADIATION
STELLAR RADIATION
ULTRAVIOLET RADIATION
VARIATIONS