Reconstruction of the solar EUV irradiance from 1996 to 2010 based on SOHO/EIT images

Journal of Space Weather and Space Climate

and Seth Wieman³  Giulio Del Zanna¹  Cis Verbeeck⁴  Benjamin Mampaey⁴  Véronique Delouille⁴  Margit Haberreiter² 

[1] DAMTP, Centre for Mathematical Sciences,Wilberforce Road,CambridgeCB3 0WA,UK;Physikalisch-Meteorologisches Observatorium and World Radiation Center,Dorfstrasse 33,CH-7260Davos Dorf,Switzerland;University of Southern California Space Sciences Center,835 Bloom Walk,Los Angeles,CA 90089,USA;STCE/Royal Observatory of Belgium,Avenue Circulaire 3,1180Brussels,Belgium

关键词: Space Weather;    Spectral irradiance;    Solar cycle;    Sun;    Corona;   

Others  :  1075701
DOI  :  doi:10.1051/swsc/2014027

 received in 2013-10-10, accepted in 2014-08-28,  发布年份 2014

【 摘 要 】

The solar Extreme UltraViolet (EUV) spectrum has important effects on the Earth’s upper atmosphere. For a detailed investigation of these effects it is important to have a consistent data series of the EUV spectral irradiance available. We present a reconstruction of the solar EUV irradiance based on SOHO/EIT images, along with synthetic spectra calculated using different coronal features which represent the brightness variation of the solar atmosphere. The EIT images are segmented with the SPoCA2 tool which separates the features based on a fixed brightness classification scheme. With the SOLMOD code we then calculate intensity spectra for the 10–100 nm wavelength range and each of the coronal features. Weighting the intensity spectra with the area covered by each of the features yields the temporal variation of the EUV spectrum. The reconstructed spectrum is then validated against the spectral irradiance as observed with SOHO/SEM. Our approach leads to good agreement between the reconstructed and the observed spectral irradiance. This study is an important step toward understanding variations in the solar EUV spectrum and ultimately its effect on the Earth’s upper atmosphere.

【 授权许可】

   
© M. Haberreiter et al., Published by EDP Sciences 2014

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