Solar Minima Comparative Analysis with EUV Tomography

LLOVERAS, DIEGO; NUEVO, FEDERICO A.; VAN DER HOLST, BART; ALBERTO M. VASQUEZ; FRAZIN, RICHARD A.

San Francisco

Congreso; American Geophysical Union Fall Meeting; 2015

AGU

The last three solar cycles have shown a systematic decrease of activity, with the last minimum (2008) being considerably more quiet than the previous one (1996), as well as magnetically weaker. We present a comparative analysis of the solar corona for last two minimima, based on Differential Emission Measure Tomography (DEMT) of time series of images taken by EIT/SOHO and EUVI/STEREO. The aim of the work is to establish if there were systematic thermodynamical differences between the two periods in the lower corona. We discuss our results in the context of other works.