EUV and UV Irradiance Variations and Evolution of Magnetic Fields

Physics

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7509 Corona

Scientific paper

Continuous solar EUV measurements started by the SEM experiment on SOHO in late 1995 providing high cadence data in a broad-band channel (0.1 -- 50 nm) and in the vicinity of the ionospherically important 30.4 nm line. In addition to the SEM experiment, the "EUV Grating Spectrometer (EGS)" instrument on the "Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED)" mission has been providing measurements since December 2001 in the 0 -- 200 nm spectral range, including the soft X-ray (XUV) from 0 to 30 nm, the extreme ultraviolet (EUV) from 0 to 120 nm, and the far ultraviolet (FUV) from 120 to 200 nm. In this paper we show results on the observed EUV and UV irradiance variations related to the changing solar magnetic fields, using the physical parameters (area, intensity, and magnetic field strength) of various solar magnetic structures derived from the analysis of the "Michelson Doppler Imager (MDI)" on SOHO. We show the association between XUV and EUV variations and magnetic structures on various time scales:over the solar cycle, on rotational time scales, and on time scales of minutes to hours.

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