The following videos show Sun in ultra-violet colors from AIA telescope on NASA/SDO spacecraft,
in various combinations of channels...
The videos are not resized to fit visible screen area in order to preserve original quality...
(These are generated from full-resolution 4K images
and scaled down to 2K before saving Jpegs in order to minimize noise and sharpen them,
and then eiher scaled down to 1K full-disk videos,
or cropped 1280x720 or similar in 2K resolution, into MP4 videos...
Need to say, that quality of MP4 videos is not as high as the quality of preview Jpegs
used as video posters...)
To better understand size of the Sun, this is planet Earth at that distance in the resolution of 2K images:
Cloud-tops of ultra-violet Solar clouds visible as “floor” at these images are cca 4850 km
above “visible” Solar surface...
Typical playback speed is 8 hours per second (day in 3 seconds)
8 fps with 1-hour stepping,
but if there is something interesting, the playback slows down, usually to 20-minute stepping,
at most to 2 minute stepping (16 minutes per second)
Some videos are available in smaller resolution
can be switched by buttons on left side of video...
The following video (AIA Planckian Mapping 171,211,304)
shows probably the best 7 seconds of the following videos,
for those who are impatient...
(click to play, right click to download...)
This Aia/PM format is suitable for studying the hot regions...
Shorter preview of PM/CH detail in 2K resolution, smaller view of southern eruptions, rotated 90° left:
CoroHole details in 2K (or 1K)
resolution, single scene from 2023-07-23 to 2023-08-15:
This format is suitable to study shadows and holes in Solar atmosphere...
PM/CH detail in 2K resolution - southern eruptions, rotated 90° left:
This PM/CH mix (or compromise)
suitably displays details of Solar atmosphere...
PM/CH - Planckian Mapping combined with CoroHole - full-disk view of the selected time range from 2023-07-13 to 2023-08-15:
PM/CH details in 2K resolution - multiple scenes - almost 8 minutes (little less than 08:19 light travel time from Sun to Earth)
, almost 387 MiB
file... Smaller version is available:
PM/CH detail in 2K resolution with only the scene “26
PM/CH details in 2K resolution - larger view:
AIA/PM - Planckian Mapping using channels 171,211,304 - full-disk view:
AIA/PM detail in 2K resolution - southern eruptions, rotated 90° left:
CoroHole full-disk view...
This combines channels 193 and 171 and serves to emphasize coronal holes and shadows,
while lighter features are usually hidden near white color:
WhiteEx - Heq HC (histogram equalization, high-contrast)
- only channel 193 with emphasis on darker places, full-disk...
This type was used in many my articles to emphasize coronal holes and shadows:
The blue line shows solar equator... Notice, that active regions above and below the equator have opposite orientation of positive (green)
and negative (yellow)
Ultra-violet Sun in Octave colors...
The channel 171, translated 5 octaves down, maps to 17.1*32 = 547.2 nm - near the green peak (544)
the channel 193, translated 5 octaves down, maps to 617.6 nm - deep red,
and channel 304 would map to infra-red range if translated 5 octaves down,
so it is translated only 4 octaves to 486.4 nm, which is blue...
Where are boundaries of visible light color octave is not clear,
human vision is in the range 390 to 704 nm, fully within one octave...
Numerologically nice would be to define color octave from 360 to 720 nm...
But for translating EUV colors by whole octaves,
the precise boundaries of octaves are not needed,
since octave down or up is frequency multiplied or divided by 2...
These EUV (extreme-ultra-violet)
colors of Solar clouds
as defined by SDO spacecraft telescope and other similar ones
are 171-304 A (angstrom)
, which is 17.1-30.4 nm,
five or four octaves above frequency of visible light...