Title: Short-term and long-term variability of solar ultraviolet Irradiances in recent years: Association with ionospheric parameters and stratospheric ozone
Author: Dr. R. P. Kane
Affil: INPE, São Jose dos Campos, 12227-010, SP, BRAZIL
Email: kane@laser.inpe.br
Authors: Dr. Thomas Woods
Affils: LASP, Boulder, Colorado
Abstract: The short-term (27-day events) and long-term variabilities of solar line emissions (120-280 nm) and radio emissions (245-2800 MHz) were studied during 1991-2000. The amplitudes of the 27-day oscillations were obtained by MESA (Maximum Entropy Spectral Analysis) and MRA (Multiple Regression Analysis). The amplitudes were small (1-2%) near the solar surface and in the lower chromosphere, increased to 
10% in the upper chromosphere and lower transition region, decreased in the upper transition region, increased to 12% in the lower corona, and decreased thereafter in the middle and upper corona. The long-term variability also showed qualitatively a similar pattern. Relationships of both short-term and long-term solar variability with stratospheric ozone were poor. Ionospheric foF2 showed poor to mediocre relationship for short-term variability.