The Solar Radius and Limb Brightening in the EUV during the Cycle XXIII

Details The Solar Radius and Limb Brightening in the EUV during the Cycle XXIII The Solar Radius and Limb Brightening in the EUV during the Cycle XXIII

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...122.115g&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

We have determined the solar transition region and coronal radius at EUV wavelengths and its time evolution during Solar Cycle XXIII using daily 30.4 and 17.1 nm images obtained by the Extreme Ultraviolet Imager (EIT) aboard the SoHO satellite. The radius was obtained by fitting a circle to the limb brightness ring. The weighted mean of the temporal series gives (967''.56 ± 0''.04) and (969''.54 ± 0''.02) at 30.4 and 17.1 nm respectively. No significant correlation was found with the solar cycle at neither of the two wavelengths. Since the temperature formation of the 30.4 nm line is between (60 - 80) 103 K (Transition Region), the obtained result is greater than that derived from present optical atmospheric models. On the contrary, this height is compatible with radio models. We also present results of the limb brightening time evolution.

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