Solar corona videos (i.e., Solar corona videos):
1. Comet Lovejoy in SOHO (1995--2025?) 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.
2. Coronal Mass Ejection 2006 Nov22 | 0:07: Observed by the Solar and Heliospheric Observatory (SOHO (1995--2025?)) in some wavelength band.
3. Amazing CME-Fireworks Observed by LASCO C3 (May 2-31, 1998) | 0:24: Impressive, but NOT explanatory.
4. SOHO (1995--2025?) 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.
5. NASA | SDO's Ultra-high Definition View of 2012 Venus Transit | 3:06 : The 2012 transit of Venus (2012 Jun05--Jun06) as observed by the spacecraft Solar Dynamics Observatory (SDO, 2010--2030?). The videos and images shown in false color are constructed from several wavelength bands in extreme ultraviolet = EUV (0.01--0.121 μm) and the visible band (fiducial range 0.4--0.7 μm):
   1. 0.0170 μm is the gold color Sun. Shown is the solar atmosphere. There are coronal loops, but they do NOT seem to extend into the corona in this video. 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 band (fiducial range 0.01--0.4 μm) unlike solar prominences which are cooler and most visible visible band (fiducial range 0.4--0.7 μm). The coronal loops are best seen at ∼ 2:13 in the video.
   2. 0.0304 μm is the red Sun. Shown is the solar atmosphere.
   3. 0.170 μm is the magenta Sun.
   4. filtered visible light is true color yours truly thinks and is mostly seen as yellow color band (∼ 0.570--0.590 μm) and orange color band (∼ 0.590--0.620 μm). There are sunspots visible. Note the Sun is always seen as much more violent in the X-ray band (fiducial range 0.1--100 Å) and ultraviolet band (fiducial range 0.01--0.4 μm = 100--4000 Å) than in the visible band (fiducial range 0.4--0.7 μm = 4000---10000 Å).
   5. Venus is black. It is much, much less bright than the Sun in all the bands shown even on the day side and we are mostly looking at the night side. So by contrast, Venus is very black. Venus's 0.9499 times the Earth diameter (equatorial value 12,756.2740 km), and so is small compared to the Sun. The Sun diameter is ∼115 Venus diameters. However, in during the transit, the angular diameter of the Sun is ∼ 32 times that of Venus because Sun is at ∼ 1 astronomical unit (AU) and Venus at ∼ 0.277 astronomical units (AU).
   With omissions, short enough for the classroom.
Local file: local link: solar_corona_videos.html.
File: Sun file: solar_corona_videos.html.