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Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations
Computational Physics, Inc., Springfield, Virginia, USA
E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington DC, USA
E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington DC, USA
Space Science Applications Laboratory, Aerospace Corporation, El Segundo, California, USA
The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Geophysical Institute and the Physics Department, University of Alaska Fairbanks, Fairbanks, Alaska, USA
Space Science Applications Laboratory, Aerospace Corporation, El Segundo, California, USA
Space Science Center, University of Southern California, Los Angeles, California, USA
Space Science Center, University of Southern California, Los Angeles, California, USA
Remotely sensed ultraviolet emissions from the Earth's upper atmosphere are shown to mirror fluctuations in solar EUV irradiance during July 2002, including the overall increase and decrease as the Sun rotated, and episodic increases associated with multiple solar flares. The TIMED/GUVI dayglow observations are used to derive a new quantity, Q EUV GUVI , which is a measure of integrated solar EUV electromagnetic energy shortward of 45 nm. Both the absolute Q EUV GUVI values and their modulation by solar rotation agree well with the corresponding solar EUV energy estimated by the NRLEUV irradiance variability model. The Q EUV GUVI values do not support recent suggestions that the solar EUV irradiances estimated by the model of Hinteregger et al. be increased by a factor of four, nor even a factor of two.
Received 14 August 2003; accepted 8 December 2003; published 3 February 2004.
Citation: (2004), Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations, Geophys. Res. Lett., 31, L03801, doi:10.1029/2003GL018415.
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