Starship Asterisk*

orin stepanek wrote: ↑Tue Dec 29, 2020 1:13 pm I liked the clip; but I wish it were slower! It's over before you realize what's going on!

zeecatman wrote: ↑Tue Dec 29, 2020 10:04 am What a great way to portray an eclipse. I'm mesmerized by this geostationary view! I love watching the clouds dance around. Are there any places where one could view longer shots of the Earth from this perspective? Also, is there a reason that even at night, some clouds are brightly lit while others are more predictably dark? (Maybe it's just due to post-processing?)

johnnydeep wrote: ↑Tue Dec 29, 2020 4:38 pm

orin stepanek wrote: ↑Tue Dec 29, 2020 1:13 pm I liked the clip; but I wish it were slower! It's over before you realize what's going on!

Click the gear icon - - and change the playback speed to .25. All YouTube videos allow that, as well as speeding them up by up to a factor of 2.

johnnydeep wrote: ↑Tue Dec 29, 2020 4:40 pm

zeecatman wrote: ↑Tue Dec 29, 2020 10:04 am What a great way to portray an eclipse. I'm mesmerized by this geostationary view! I love watching the clouds dance around. Are there any places where one could view longer shots of the Earth from this perspective? Also, is there a reason that even at night, some clouds are brightly lit while others are more predictably dark? (Maybe it's just due to post-processing?)

Good question. I am also wondering how we can see any detail on the night side of the terminator.

Chris Peterson wrote: ↑Tue Dec 29, 2020 5:31 pm

johnnydeep wrote: ↑Tue Dec 29, 2020 4:40 pm

zeecatman wrote: ↑Tue Dec 29, 2020 10:04 am What a great way to portray an eclipse. I'm mesmerized by this geostationary view! I love watching the clouds dance around. Are there any places where one could view longer shots of the Earth from this perspective? Also, is there a reason that even at night, some clouds are brightly lit while others are more predictably dark? (Maybe it's just due to post-processing?)

Good question. I am also wondering how we can see any detail on the night side of the terminator.

The imaging instrument covers bands from 450 nm to 13.6 um. It's unclear what bands were used to construct the image, but I think it's pretty clear that some of the IR bands were included.

What exactly do GOES detect?
Geostationary weather satellites work by sensing electromagnetic radiation to indicate the presence of clouds, water vapor, and surface features. Unlike ground-based radar systems and some other types of satellites, these satellites do not send energy waves into the atmosphere and analyze returning signals. Rather, GOES work by passively sensing energy. GOES sense visible (reflected sunlight) and infrared (for example, heat energy), from Earth’s surface, clouds, and atmosphere. Earth and the atmosphere emit infrared energy 24 hours a day, and satellites can sense this energy continuously. In contrast, visible imagery is available only during daylight hours when sunlight is reflected.

How do GOES detect this energy?
The instruments on GOES that measure electromagnetic energy are called radiometers. GOES carry two types of imagers: One measures the amount of visible light from the sun that Earth’s surface or clouds reflect back into space. The second measures the infrared energy that Earth’s surface and clouds radiate back to space. Because GOES can sense infrared radiation, they can operate at night.

johnnydeep wrote: ↑Tue Dec 29, 2020 5:41 pm

Chris Peterson wrote: ↑Tue Dec 29, 2020 5:31 pm The imaging instrument covers bands from 450 nm to 13.6 um. It's unclear what bands were used to construct the image, but I think it's pretty clear that some of the IR bands were included.

No doubt you are correct. I found this about GOES (Geostationary Operational Environmental Satellite)- https://www.goes-r.gov/resources/faqs.html