Comet Lovejoy in SOHO (1995--2022?) LASCO C3 | 0:36: Comet Lovejoy W3 (a Kreutz sungrazer example of a sungrazing comet) does a sungrazing perihelion in 2011. There are some coronal mass ejections (CMEs) too. Good for the classroom.
Coronal Mass Ejection 2006 Nov22 | 0:07: Observed by the Solar and Heliospheric Observatory (SOHO (1995--2022?)) in some wavelength band.
Amazing CME-Fireworks Observed by LASCO C3 (May 2-31, 1998) | 0:24: Impressive, but NOT explanatory.
SOHO (1995--2022?) LASCO C2 May 2010 Solar Images | 9:14 : You can see at least 3 coronal mass ejections: the most obvious ones at about 0:40, 1:30, and 2:20. Too long for classroom, but you can jump to the coronal mass ejections.
Magnetic coronal loops of the sun | 0:07 : Note these are coronal loops, but they do NOT seem to extend into the corona in this video. Short, spectacular, and, false color since the light is in the ultraviolet (FK-399)???. Remember the Sun's diameter is ∼ 109 times the Earth mean diameter = 12,756.2 km. So those coronal loops are huge structures. Coronal loops are similar to solar prominences in geometric structure and in being magnetic weather, but they are hotter and most visible in the ultraviolet unlike prominences which are cooler and most visible in the visible. Short enough for the classroom.