Segmentation of Coronal Features to Understand the UV and EUV Irradiance Variations

Abstract : The Sun is the primary source of energy responsible for governing both the weather and climate of Earth. For that reason alone one would expect that changes in the amount and type of energy Earth received from the Sun could alter weather and climate on the Earth. The variations in the UV and EUV irradiance are produced by surface manifestation of solar magnetic activity. Considering the variations in the solar UV and EUV flux may cause significant changes in the Earth's climate, understanding the physical origin of UV and EUV irradiance changes is an extremely important issue in Solar and Space Physics. We have attempted to segregate the different coronal features such as active regions, coronal holes, coronal bright points and background region from the spatially resolved full-disk images of PROBA2/SWAP instrument. We have applied a pattern recognition technique to segregate these features. The analysis has been carried out on the images obtained for the period of two years(01-02-2010 to 31-01-2012). We have derived various parameters like the intensity and area of the coronal features and the full-disk intensity. The time series of these parameters are compared with PROBA2/LYRA observations to understand the UV and EUV irradiance variations. The important results of these analysis are discussed in this paper.
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Submitted on : Friday, October 5, 2012 - 4:24:46 PM
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  • HAL Id : hal-00739080, version 1

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S. T. Kumara, R. Kariyappa, Luc Damé, Jean-François Hochedez, Vijayakumar H. Doddamani. Segmentation of Coronal Features to Understand the UV and EUV Irradiance Variations. 39th COSPAR Scientific Assembly 2012, Jul 2012, Mysore, India. ⟨hal-00739080⟩

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