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The triggering process for coronal mass ejections (CME) in the solaratmosphere is not fully understood. We use observations from differentspacecraft at several wavelengths to detect an instability process for aprominence/filament with a subsequent eruption of CME. Time series of spectrallines at 304, 171, 193, and 211 {\AA} have been obtained with the SDOspacecraft, and at 304, 171, 195, and 284 {\AA} with the STEREO spacecraft. Aprominence/filament system was observed during November 8-23, 2011, atdifferent angles by SDO, STEREO_A, and STEREO_B. The observations show that agiant tornado began to develop near the base of the prominence at 20:00 UT onNovember 20, which later caused the appearance of droplets of coronal rain (at16:00 UT, November 21) which fell downward from the main mass of theprominence. The coronal rain continued until 20:20 UT, November 22, and causedinstability of the prominence, after which a CME took place at 22:30 UT onNovember 22. We assume that the loss of mass owing to coronal rain may lead toinstability of prominences and their subsequent eruption. Observations ofcoronal rain falling from the main part of the mass of prominences could beused for predicting space weather.

Eruption of prominence triggered by coronal rain in the solar atmosphere observed by SDO/AIA and Stereo/EUVI