Temporal trends of solar EUV and UV full-disk fluxes

Physics

Scientific paper

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Extreme Ultraviolet Radiation, Solar Flux, Solar Radiation, Solar Rotation, Ultraviolet Radiation, High Resolution, Nonthermal Radiation, Solar Activity, Solar Atmosphere, Solar Physics

Scientific paper

Several progressions in the temporal characteristics of full-disk solar UV and EUV fluxes have been identified that raise many questions about the solar physics involved. The collective effect of numerous enhancements smaller than scaled plages contribute significantly to the solar cycle variations, especially for emissions from the cooler portions of the corona and the chromosphere. Active-region remnants are suggested to have a strong role even in solar-rotation induced variations late in an episode of major activity. Although cool coronal EUV emissions are long lasting, the persistence of the solar-rotation induced variations is even greater at photospheric UV wavelengths. Gyroresonance and possibly nonthermal radio emission at centimeter wavelengths are suggested to be particularly important during the first solar rotation of an episode of major activity.

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